17311 - Lap Trinh Ghep Noi May Tinh _2

8/3/2019 17311 - Lap Trinh Ghep Noi May Tinh _2

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B GIAO THNG VN TITRNG I HC HNG HI

B MN: K THUT MY TNHKHOA: CNG NGH THNG TIN

BI GINGLP TRNH

GHP NI THIT BNGOI VI

TN HC PHN : LP TRNH GHP NITHIT BNGOI VI

M HC PHN : 17311TRNH O TO : I HC CHNH QUYDNG CHO SV NGNH : CNG NGH THNG TIN

HI PHNG - 2010


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MC LC

Chng 1: Cc chun ghp ni. .................................................................................................. 51.1. Cng song song................................................................................................................... 5

1.1.1. Cu trc cng................................................................................................................ 51.1.2. Trao i cng song song vi ng dn tn hiu ......................................................... 61.1.3. Lp trnh cng song song ............................................................................................. 8

1.2. Cng ni tip ....................................................................................................................... 81.2.1. Cc c trng in p ................................................................................................... 81.2.2. Khn mu khung truyn ............................................................................................. 101.2.3. Cc vn truyn thng ............................................................................................. 11

1.3. Bus ni tip a nng.......................................................................................................... 121.3.1. Bus ni tip a nng - Gii thiu chung ..................................................................... 12

1.3.2. u ni v cp tn hiu ............................................................................................... 131.3.3. Truyn d liu ni tip ............................................................................................... 141.3.4. Phn cng, phn mm v kt ni h thng ................................................................. 141.3.5. Chun USB 2.0 ........................................................................................................... 15

1.4. Khe cm m rng.............................................................................................................. 151.4.1. BUS ISA 16 bit ........................................................................................................... 15

1.4.2. BUS PCI ..................................................................................................................... 171.4.4. Ghp ni qua khe cm m rng.................................................................................. 18

Chng 2. Bus Ghp ni a nng ............................................................................................. 20

2.1. t vn .......................................................................................................................... 202.2. Tiu chunIEEE-488 truyn thng................................................................................... 202.3. Cu hnh v hot ng ca Bus GPIB............................................................................... 21

Chng 3. Vng o in p ....................................................................................................... 233.1.Truyn d liu bng vng dng in .................................................................................. 233.2. Vng dng in 60mA ....................................................................................................... 233.3. Vng dng in 20mA ....................................................................................................... 243.4. Vng dng in 4 n 20mA.............................................................................................. 25

Chng 4. Cc mch iu khin vi b bin i A/D ............................................................. 26

4.1. Card bin i A/D 12 bit dng ICL7107........................................................................... 264.2. Card bin i A/D 12 bit dng ADC547........................................................................... 264.3. Card bin i ADA 9-16 bit ............................................................................................... 27

Chng 5. Tng ha vi PCL S7-200 .................................................................................. 295.1. B iu khin kh trnh PCL ............................................................................................. 295.2. Son tho chng trnh vi PCL....................................................................................... 30

Chng 6. Hvi iu khin 8951 .............................................................................................. 336.1. Cu trc phn cng........................................................................................................... 336.2. Tp lnh ............................................................................................................................. 35


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YU CU V NI DUNG CHI TIT

Tn hc phn: Lp trnh ghp ni thit b ngoi vi Loi hc phn:2B mn ph trch ging dy:K thut my tnh Khoa ph trch:CNTT

M hc phn: 17311 Tng s TC: 2

TS tit L thuyt Thc hnh/Xemina T hc Bi tp ln n mn hc

45 30 15 0 0 0

iu kin tin quyt:Sinh vin phi hc xong cc hc phn sau mi c ng k hc phn ny:Kin trc my tnh, in t s, Mch v tn hiu, Vi x l, K thut lp trnh

Mc tiu ca hc phn:

- Cung cp cc kin thc c bn v cu trc, nguyn l hot ng ca h thng giaotip vi th gii bn ngoi.

- Nm c cc phng thc iu khin vo/ra d liu.

- Hiu r nguyn tc, cch thc phi ghp cc b iu khin c bn

Ni dung ch yuChng I. Cc chun ghp ni.Chng II. Bus Ghp ni a nng.Chng III. Vng o in p.Chng IV. Cc mch iu khin vi b bin i A/D.

Chng V. H vi iu khin 805x.Ni dung chi tit ca hc phn:

TN CHNG MCPHN PHI S TIT

TS LT BT TH KT

Chng I. Cc chun ghp ni. 25 16 9

1.1. Cng song song

1.1.1. Cu trc cng 1

1.1.2. Trao i cng song song vi ng dn tn hiu 11.1.3. Lp trnh cng song song 2 3

1.2. Cng ni tip RS-232

1.2.1. Cc c trng in p 1

1.2.2. Khun mu khung truyn 0.5

1.2.3. Cc vn truyn thng 0.5

1.2.4. Lp trnh cho cng ni tip RS-232 1 3

1.3. Bus ni tip a nng

1.3.1. Gii thiu chung 0.5

1.3.2. u ni v cp tn hiu 0.51.3.3. Truyn d liu ni tip 0.5


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TN CHNG MCPHN PHI S TIT

TS LT BT TH KT

1.3.4. Phn cng, phn mm v kt ni h thng 0.5

1.3.5. Chun USB 2.0 0.5

1.3.6. Cc kiu truyn v phn mm iu khin 0.5

1.3.7. Lp trnh Bus ni tip a nng 2 31.4. Khe cm m rng

1.4.1. BUS ISA 16 bit 1

1.4.2. BUS PCI 1

1.4.3. BUS AGP 1

1.4.4. Ghp ni qua khe cm m rng 1

Chng II. Bus Ghp ni a nng 3 2 1

2.1. t vn 0.5

2.2. Tiu chun IEEE-488 truyn thng 0.52.3. Cu hnh v hot ng ca Bus GPIB 1

Chng III. Vng o in p 3 3

3.1.Truyn d liu bng vng dng in 1

3.2. Vng dng in 60mA 0.5

3.3. Vng dng in 20mA 0.5

3.4. Vng dng in 4 n 20mA 1

Chng IV. Cc mch iu khin vi b bin i A/D 6 3 3

4.1. Card bin i A/D 12 bit dng ICL7107 0.5

4.2. Card bin i A/D 12 bit dng ADC547 0.54.3. Card bin i ADA 9-16 bit 1

4.4. B m tn s dng cho my tnh 1

Chng V. H vi iu khin 51 3 2 1

5.1. B iu khin kh trnh PCL 1

5.2. Son tho chng trnh vi PCL 1

Chng VI. H vi iu khin 51 5 2 3

6.1. Cu trc phn cng 0,5

6.2. Tp lnh 1

6.3. Kt ni iu khin bng 8951 0,5

Nhim v ca sinh vin :Tham d cc bui thuyt trnh ca gio vin, t hc, t lm bi tp do gio vin giaotham d cc bui thc hnh, cc bi kim tra nh k v cui k.

Ti liu hc tp :- Ng Din Tp, o lng v iu khin bng my tnh, NXB KH&KT- Ng Din Tp, K thut ghp ni my tnh, NXB KH&KT- Phan Xun Minh, T ng ha vi SIMATIC S7-2000, NXB NN- K thut lp trnh PLC-SPC

- MSC 51 Microcontroller family user's manual- Intel


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Hnh thc v tiu chun nh gi sinh vin:- nh gi da trn tnh hnh tham d bui hc trn lp, cc bui thc hnh, im

kim tra thng xuyn v im kt thc hc phn.

- Hnh thc thi cui k: thi vit.

Thang im: Thang im ch A, B, C, D, Fim nh gi hc phn Z = 0.3X + 0.7Y.

Bi ging ny l ti liu chnh thc v thng nhtca B mn K thut my tnh, KhoaCng ngh Thng tin v c dng ging dy cho sinh vin.

Ngy ph duyt: 25 / 10 / 2009Trng B mn: ThS. Ng Quc Vinh


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Chng 1: CC CHUN GHP NI

1.1. Cng song song

1.1.1. Cu trc cng

Cng song song c hai loi: cm 36chn v cm 25 chn. Ngy nay, loi cm 36 chn khng cn c s dng, hu ht cc my tnh PC u trang b cm 25 chnnn ta ch cn quan tm n loi 25 chn.

TN TN HIUV TRCHN CHCNNG

Strobe 1Khi t mt mc in p LOW vo chn ny, mytnh thng bo cho my in bit c mt byte snsng trn cc ng tn hiuc truyn.

D0 2

Cc ng d liu ( 8 ng )

D1 3

D2 4D3 5

D4 6

D5 7

D6 8

D7 9

Acknowledge 10Mc LOW chn ny, my in thng bo cho mytnh bit nhn c k t va gi v c th tiptcnhn.

Busy (Bo bn) 11

My in gi mt mc lgic HIGH vo chn nytrong khi ang n nhn hay ang in ra d liu thng bo cho my tnh bitb m d liu yhay my in ang trng thi Off-line

Paper empty (Ht giy) 12My in t trng thi trkhng cao (HIGH) chnny khi ht giy.

Select (La chn) 13Mt mc HIGH c ngha l my in ang trongtrng thi c kch hot .

Auto Linfeed (Tngnp dng)

14Mc LOW chn ny my tnh nhc my in tng np mt dng mi mi khi kt thc mt dng.

Error (C li) 15 Mc LOW chn ny, my in bo cho my tnhbit xy ra li khi in.

Reset (t li trngthi my in)

16 My in c t tr li trng thi c xc nhlc ban u khi chn ny mc LOW.

Select Input (La chnli vo)

17 Bng mt mc LOW my in c la chn bimy tnh.

Ground (Ni t) 18-25

Qua bng trn ta thy cp ni gia my tnh v my in bao gm 25 si, tuy nhinkhng phi tt c cc si cp uc sdng nh vy chng ta c th tndng dy cp

ny nu c mt vi sibt.


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Qua cch m t chc nngcatng tn hiu ring l ta c thnhn thy l cc ngdn tnhiu c th chia thnh 3 nhm:

Cc ng dn tn hiu xut ra t my tnh PC v iu khin my in, c gil cc ngdniu khin.

Cc ng dn tn hiu, a cc thng bo ngc li t my in v my tnh, cgi l cc ngdntrng thi.

ng dnd liu,truyn cc bit ring lca cc k t cn in.T cch m t cc tn hiu v mc tn hiu ta c th nhn thy cc tn hiu

Acknowledge, Auto Linefeed, Error, Reset, v Select Input kch hot mc Low.Thng qua chc nng ca cc chn ny ta cng hnh dung c cch iu khin my in.

Cn ch l 8 ng dn song song uc dng chuyn d liu t my tnhsang my in. Trong nhng trng hp ny, khi chuyn sang ng dng o lng v iukhin ta phi chuyn d liu t mch ngoi vi vo my tnh thu thp v x l. V vyta phi tn dng mt trong nm ng dn theo hng ngc li, ngha l t bn ngoivo my tnh truyn s liu olng.

1.1.2. Trao i cng song song vi ng dn tn hiu c th ghp ni cc thit b ngoi vi, cc mch in ng dng trong o lng

v iu khin vi cng song song ta phi tm hiu cch trao i vi cc thanh ghi thngqua cch sp xp v a ch cc thanh ghi. Cc ng dn ca cng song song c nivi ba thanh ghi 8 bit khc nhau:


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THANH GHI DLIU ACH ( 278H, 378H, 2BCH, 3BC H)

THANH GHI TRNG THI ACH ( 279H, 379H, 2BDH, 3BD H)

THANH GHI IU KHIN A CH ( 27AH, 37AH, 2BEH, 3BE H)

Nh s trn trnh by 8 ng d liu dn ti thanh ghi d liu cn 4 ngdn iu khin Strobe, Auto Linefeed, Reset, Select Input dn ti thanh ghi iu khin.Nmng dntrng thi Acknowledge, Busy, Paper Empty, Select, Error ti thanh ghitrng thi.

Thanh ghi d liu hay 8 ng dn d liu khng phi l ng dn 2 hng trongttc cc loi my tnh nn d liu ch c thcxut ra qua cc ng dn ny c tht D0 n D7. Thanh ghi iu khin hai hng, hay ni chnh xc hn: Bn bit c gi trthp c sp xp cc chn 1, 14, 16, 17. Thanh ghi trng thi ch c th c cv v vy c gi l mt hng.


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1.1.3. Lp trnh cng song songVic truy nhp trc tip ln cc giao din ca my tnh PC, c th l ln cc

ng dn ring lc tin hnh thun li nht l bnghpng, Cc ngn ngbc caonh Turbo Pascal hoc C cng c nhng lnhn gin thc hin vic truy nhp ln cccng tuy rngtc truy nhp c thphni cht.

Trc ht ta cn bit a ch ca cc cng m qua cc giao din song song c th

c trao i. Sau s quyt nh c d liu trong thanh ghi no hoc xut d liu rathanh ghi no?

Ni chung, cc lnhc sdng c th vit nh sau:

Bng hp ng xut ra d liu OUT DX, AL

nhp vo d liu IN AL, DXTrong a ch ca thanh ghi cn trao iphi ng trong DX. V d: Gi s

LPT1 c a ch l 378HMOV DX,378H; Npachcacng LPT1 vo thanh ghi DX

OUT DX,AL; Xut ni dung ca thanh ghi AL ln ng dn d liu (T D0 nD7) ca LPT1.

Hai lnh sau yc cc byte ngdnd liu cacng LPT1:MOV DX, 378H;Npachca cng LPT1 vo thanh ghi DXIN AL,DX: c thng tin trn cc ng dndliu (TD0 n D7) ca LPT1 sang

thanh ghi AL.

Hai lnh sau y xut ni dung ca thanh ghi AL sang thanh ghi iukhinca LPT1.

MOV DX,37AH;Np a ch ca thanh ghi iu khin cng LPT1 vo thanh ghi DX

OUT DX,AL; Mang ni dung ca thanh ghi AL sang thanh ghi iu khin ca LPT1.

Hai lnh sau yc cc byte ngdntrng thi ca cng LPT1 tvo thanh ghi AL.

MOV DX, 379H; Npachca thanh ghi trngthi vo thanh ghi DXIN AL,DX; c ni dung ca thanh ghi trngthi ca LPT1 sang thanh ghi AL.

Bng TurboC xut ra d liu Outportb(a chcng,Gi tr)nhp vo d liu Inportb(a chcng)

VdLnh sau y xut gi tr 5 qua thanh ghi dliucacng LPT1Outportb(0x378, 5)

Lnh sau yc thng tin ca thanh ghi trng thi ca cng LPT1 sp xp vo binstatus

Status= Inportb(0x379)

1.2. Cng ni tip

1.2.1. Cc c trng in p+12V l mc logic 0 (LOW) Mt trong nhng thng s quan trng nht ca RS232 l

mc in p trn ng truyn. RS232 u tin s dng mc n p TTL ging nh cngsong song. Chnh v th ngay sau khi ra i RS232 xut hin nhu cu phi ci tin. Ngoi mc in p th tiu chun cng quy nh r gi tr ca tr khng ti u vo bus v tr khng


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ra ca b pht v b m. Hng ci tin ca mc in p l tng gi tr ca in p truyn tng kh nng chng nhiu do vy truyn c xa hn.

T s trn ta thy ci tin ca RS232B l lm tng mc in p t 5V n 25V,

Trong :Mc logic 1 tnh t -5V n -25V.Mc logic 0 tnh t +5V n +25V.Cc mc t -3V n +3V gi l trng thi chuyn tip. Cc mc in p t 3V n

5V gi l khng xc nh. D liu c mc in p ri vo khong ny s dn n kt qukhng d tnh c v y cng l tnh trng hot ng ca nhng h thng c thit b ks si. iu ng ch y l: Mc 1 ~ LOW, mc 0 ~ HIGH v trc khi a vo x lcn c b nho cn gi l b nh chun dng tn hiu.

Vic nng mc in p ca chun RS232B dn n s hn ch v tc truyn, v vyngi ta thy gia tc truyn v khong cch truyn phi c s dung ho. RS232C l

chun hin nay ang c p dng.in p s dng l 12V. Trong :-12V l mc logic 1 (HIGH)C th:+3V -> +12V l mc 0+5V -> +12V l mc tin cy (ca mc 0)

-3V -> -12V l mc 0-5V -> -12V l mc tin cy (ca mc 1)Bng vic thu hp gii hn in p ng truyn, tc truuyn d liu c tng ln

ng k. Ngoi ra chun RS232C cng quy nh tr khng ti, gi tr ny thuc phm vi3000 n 7000 ; ng thi b m phi duy tr tng in p tng i ln khong 30V/s.


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Cc vi mch Motorola loi MC1488 v MC1489 hon ton tho mn cc thng s k thutny. Cc yu cu v mt in c quy nh trong chun RS232C nh sau:

1. Mc logic 1(mc du) nm trong khong -3V -> -12V; Mc logic 0 (Mc trng) nmtrong khong +3V -> +12V.

2.Tr khng ti v pha b nhn ca mch phi nm trong khong 3000 -7000.3. Tc truyn nhn cc i 100 Kbit/s.4. Cc li vo ca b nhn phi c in dung


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Nh vy, ton b khung truyn c pht ra l 01000001111. Bit chn l dng kim tra pht hin li v sa li. Thc cht ca qu trnh ny nh sau: Khi k t ctruyn th my tnh s m s k t 1 trong k t c truyn. Nu s l chn => bitchn l =1; Nus l l => bit chn l =0. ni nhn s kim tra k tnhn c vm s 1, sau s so snh vi bit chn l. Nu ktqu trng khp th khung truyn coinh khng mc li, ngc li n s pht lnh yu cu truyn li khung truyn.Nu t l

mc li cng nhiu th tc truyn cng gim. K thut m li chn l theo kiu ny cmt c im rt n gin, nhng trong trng hpb mc li 2 ln lin hoc 4 li linth lai khng pht hin ra. Nhng trn thc t vi 7 bit c truyn th kh nng b mc 2hoc 4 li l rtnh c th xem nh khng bao gi xy ra. Chnh v vy, cch m li theokiu ny vnc dngphbintrong kthut truynd liu qua cngnitip.

Tc truyn: nh gi cht lng ca cuc truyn d liu qua cng ni tipth mt trongnhng thng sc trng quan trng l tc truyn/nhn d liu. Trong kthut truyn d liu qua cng ni tip ta thy c bit bt u, bit dng. Trong mt strnghp c bit chn l c b xung vo, nh vy c ti 10 bit c truyn trongkhi ch c 7 bit d liu, cn trong trng hp sdng 2 bit dng th c ti 11 bit truyntrong khi ch c 7 bit d liu. Nh vy nu c 10 k tc gi trong 1 giy v nunhc 11 bit csdng cho 1 k t th tctruyn thngs l 110 bit/s.Nh vy gia tc truyn bit v tctruyn kt l khc nhau.

Ngoi tctruyn bit ngi ta cn sdng tc baud. y l tn camt nh kthut ngi Php ginh nhiu cng sc nghin cu v truyn thng v ngi ta lytn ng lm n v truyn d liu. Thng thng tc bit v tc baud l ngnht, ch trong trng hp c mdem do c thm qu trnh bin i tn hiu nn 2 tcny n khc nhau.

Tcbps K t/s

110 11

300 30

600 60

1200 120

2400 240

4800 480

9600 960

19200 1920

56600 5660

1.2.3. Cc vn truyn thng

-

.:


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0,1 ms.-

.

1.3. Bus ni tip a nng

1.3.1. Bus ni tip a nng- Gii thiu chungC th ni MT t khi ra i khng ngng pht trin. Hin nay my tnh PC vn

ang c ci tin nhm nng cao nhng tnh nng cahthng. Nhng hng chnh l:+ Tiptcci tin b vi x l cng nh a ra nhngbx l mi.+ Ci tin cc hthngha, v d: card AGP

+ Nng cao tccanghh thng v ca chnh b x l.+ Ci tin cc kin trc bus c bit cc cu PCI.+ Hon thin cng ngh cm v chy (plug and play) v qu trnh t ng ci t.

c bit hon thin cng USB trgip cho vic d dng ghp ni.Nu nh my tnhdng ngun AT c hai cng RS 232 th pha sau cc my tnh i mi thng dngngun ATX u c 2 cm USB. Cng USB thc cht l BUS ,bi v qua c thuning thi rt nhiu thitb ngoi vi vi nhng chng loi khc nhau. V vy, c thgi bus USB l bus ni tip a nng theo ng ngha ca n.

Bus USB nhm thng nht cc kiu ghp ni my tnh khc nhau v mt dng uni v v vy kh nng ghp ni my tnh qua USB tr nn ht sc hp dn . Cc giaodin song song ni tip, cc my ghp hnh nh s... u c th u ni vo bus USB.Vvy trong tng lai bus USB sthcs trthnh bus anng.

Vngun gc USB ca ra sdng u tin vo nm 1996, phingianm1998 mi thc s c h tr y v th hin vai tr ca n. Cc thng k k thutca USB c cc cng ty ln cng tham gia xy dng.Trong phi k nCompaq, Digital Equipment, Nothern, Telecom, IBM, Intel, Microsoft, NEC. C th nibus USB nhanh chng tr thnh mt chun khng chnh thc. Ngi ta cng sn xutra mt card m rng cho php cm vo cc my tnh i c to ra 2 cng USB . Saukhi USB c gii thiu c nhiu thit b s dng trong lnh vc in t dn dng,truyn thng c thit k ni vo vi bus ny v Microsoft vit phn mm h tr

cho USB t nm 1998. Trong win 95 th USB c h trrty.USB l mt bus ni tip v dliu truyn trn bus tng tnh trong cng ni tip.

C th l theo tng bit mt ni tip nhau. Nhng c mtim ng lu l d liuctruyn trn cng cc ng dn theo 2 hng trong khi theo tiu chun RS232 th dliu c truyn trn cc ng dn khc nhau nhng trn mi ng ch theo mthng. S khc nhau cbn thhin ch cc giao din ni tip t trc n nay ch cthsdng cho mt thit b nhng bus USB li cho php unin 127 thit b.V vyc gi l mt bus. Mi thitbu vo unhn mt a ch v thg qua a ch nythitb c th trao i d liu vi my tnh cng nh cc thit b khc v a ch nyc m tbng 7 bit.

V mt tc , vic trao i d liu qua bus USB nhanh hn so vi qua cng RS232.Trn thc tvn tc truyn c th t c 12Mbps trn cc ng dn d liu. Dithng s c phn chia cho tt c cc thitbc u ni trn bus .Vi bus USB loi1.0 tc truyn d liu ln ti 12 Mbps, nhng version 2.0 vn tc t ti 480Mbps


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vn gi c tnh tng thch phin bn 1.0. Bus USB c mi lin quan cht ch vic tnh cmchycc my tnh PC i mi trong khi my tnh ang hotng, thit

b c thc u vo hoc tho ra m khng cn ttinngun nui trong my tnh. c tnh c gi l u ngt nng. H thng t nhnbit mt thitb mi c u vothitb USB v lp tc npphn mmiu khin hay tpm thch hp.

Nhng c tnh cbn ca bus USB c thk ra l:

+ Cc b truyn m thi c th hiu l truyn lin tc h tr cc tn hiu videov m thanh vi cc ng truyn ng thi th cc thit b truyn d liu theo kiumthi v theo kiu ontrc .

+Bus USB h tr cc thit b khng ng thi, cc thitb c quyn u tin caonht (cc thitbm thicng nhng thi c thtnti cng mt thiim).

+Cc thng s k thut cm chy cc cp v cch kt ni u c tiu chun horng ri trong cng nghip.

+Cc Hub c sn xut thnh nhiu tng vi kh nng m rng cc mc gn nhv tn v cc thao tc xy ra ngthi.

+Tc truyn l 12Mbps vi cc kch thc gi dliu khc nhau.+H trnhiu yu cu v gii thng t mt vi Mbps n 19 Mbps.

+H tr tc truyn d liu trn mt phm vi rng cc gi tr thng qua vicutit kch thcbm gi d liu v cch tim n(latency), c khnng cm nng (hotplug). Ngha l cho php thitb ngoi vi c th c ni m khng cnphi tt ngunnui cung cp in cho my tnh. C thu, ngt v thay i cu hnh ca thit bngoivi mt cch linh hot .

+Kh nng qun l nng lng c tng cng vi cc ch ngh trn phmvi h thng.

+T nhn dng thit b ngoi vi kiu mi, t ng vbn chc nng i vi

phn mmiu khin v cu hnh.

+H trcho cc thitb loi khc nhau vi nhiu cng ngh khc nhau.+iu khin lungd liu thng quabmbng vic qun l giao thc tsn bn

trong.+C thx l li v hon tr li.+H trkhnngnhn dng cc thitb mc li.

+Giao thc n gin trong vic thc hin v tch hp.USB l mt kin trc bus cn bng trong qu trnh hot ng my ch USB ng

vai tr iu khin di thng ca h thng. Mi thit b c gn mt a ch mc nhkhi thit b USB c cpin lnu hocct li. Mtcim cbn khc na

ca USB in p ngun nui (+5v) c thnhnc t bus. Cc thit b c cng sut tiuthnh c thsdng trc tip in p trn bus m khng cn c ngun nui ring.

1.3.2. u ni v cp tn hiuUSB c hai kiu u ni khc nhau c gi l A,B. H thng y c thit k

sao cho khng xy ra hin tng u ninhm. Bus USB s dng cp ni 4 si dy ni vi cc thitb ghp ni. Trong c mt cp ng truyn 2 si xon c dnglm ng dn d liu vi phn, k hiu l D+ v D-. Cn mt cp kia dng lm ng5V v ng ni t chung. Cp ni lun c thc hin lin kt 1:1. S sp xp ccchn u ni cp tun theo nhng quy nh sau:

Hai cm USB pha sau my tnh i mi nht u l kiu A, qua c th u

trc tip thitb USB vo my tnh. Cc thit b c tc thp nh chut c th uthng vo cm nybngmt phch cm cng kiu A.


15/42

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Trong cc trng hp khc thitb thng c mt cm kiu B, mun ni vimy tnh phi s dng mt cp kiu A,B. Trong trng hp cn ni di cp, tc l tng khong cch gia my tnh PC ti thit b ghp ni, ngi ta sdng cp A,A. Chon nay cc cp USB u c cc nh sn xut cung cp di dng hon chnh trn u cm, di, cht lngbc kim chng nhiu u khng th thay i c.V vy,tu theo mc ch sdng ta phi la chn thng s cp cho chnh xc tchiu di chonuni.

Qua cm USB sau my tnh c th ly ra in p + 5v vi dng in tiuth 100 mA.Trong mts trng hp c th ly ti 500 mA. Hai ng nd liu D +,D - cho php u ni vi cc linh kin USB cbit chng hn nh l mt s vi iukhin tn hiuchn D +,D l cc tn hiu vi phn vi mcin p = 0/ 3,3 v. in pngun nui cho bus c th tngn 5,25 v v khi chu dng ti ln c th gim xung 4,2v. Mt vi mch n p trong trng hp ny c th to ra mt in p n nh +3,3 v.Ton bh thng c th thit k sao cho khi chu dng ti ln in p ngun cng khngvt qu + 4,2v. Khi thitb ghp ni cn dng tiu th >100mA cn xem xt k kh

nng cung cp v chu ti ca cc linh kin pha trong MT trnh nhng hu qu ngtic c th xy ra. Khi ghp nimt thit b vi bus USB ta thngphi phn bit r ccthit b s dng ngun nui ring chng hn nh my in vi cc thitb nhn in pngun nui qua bus.Trong mt s trng hp c hai ch ngun nui c th cng tnti la ch theo cch thitk ca bus. Dng tiu th ly t bus c tng hn ch.Khi dng tiu th vt qu gii hn cho php th in p cung cpcngtngngt.

1.3.3. Truyn d liu ni tipMt c im khc na ca bus USB l ch c mt my ch ngha l mi hot

ng trn busuxutphttmytnhPCqunl.Dliucgilncngnhnhntbustheonhng ginh cha 8 -> 256 byte. My tnh PC c th yu cu d liu gi

n tmt thitbnhng ngclikhngmtthitbnoctht gidliui.Tonblngdliuucmtkhungngbng1ms.Trongphmvimtkhung

nhiugid liuk tipdnhchocc thitbkhcnhauc thcx l, trongcnhng gi d liu cn givi tc thp,cnhnggid liu cngivi tccaocngtntitrongmtkhung.

KhicnghpninhiuthitbUSBvimytnh,tacncmthpphnphihaycngi lHubchophptrnhxyra tnh trngtc tnhiucaocchuyngiao tithitbctc thp.

1.3.4. Phn cng, phn mm v kt ni h thngKhi ni mt thit b vo bus th my ch USB s tng tc vi thitb USB thng

qua b iu khinca my ch. Khi my ch chu trch nhim vnhng cng vic sau:Pht hinvickt ni hochub ca cc thitb USB


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Qun l vic iu khin dng d liu gia my ch v cc thitb USB Thng ktrng thi v tnh hotng cahthng.

Cung cp dng in c nphnch cng sut cho cc thit b USB c ktni. Trn my ch c phn mm qun l h thng USB, c th qun l s tng tc giacc thitb USB v phn mm thitb da trn my ch. C nm vng tng tc ga

phn mmh thng USB vphn mm thit bcth l:

im danh v nh cu hnh thitb.Truynd liu trong chng thi.Truynd liu trong ch khng ngb.Qun l nng lngQun l thng tin v thit b v v bus.

1.3.5. Chun USB 2.0Phinbn USB 1.0 ra i vo nm 1996 l mt thnh cng rt ln v by gi

ang l cng tiu chun trn a s cc my tnh PC i mi. Hn ch chnh ca phinbn ny l tc truyn vn cn tng i chm. cbit khi tch hp nhiu thitbngoivithnhmththngkt ni ring r. V vy, phinbn 2.0 c ra i cho

php t ti tc truyn d liu trn 480Mbps trongkhivngi tnh tng thchviphinbn1.0.Ccctnhchnhcaphinbn 2.0l:

Tcthp(1,5Mbps)dngchoccthitbtngtc.thngthng10->100Kbps.Tccao(12Mbps)dngchoccngdngccctnhiudinthovmthanh.

Thng thng500Kbps->10Mbps.Tc rt cao(470Mbps) dng cho cc ng dng video v b nh. Thng

thng 250 - >400Mbps.RrnglphinbnUSB2.0synhanhqutrnhhngtimtmytnhPCs

dng trong tng lai tc lchcndngmt loicngUSBcho ttccc thitbghpni.

1.4. Khe cm m rng

1.4.1. BUS ISA 16 bit

T tn gi cho thy y l loi bus c kin trc theo tiu chun cng nghip(IndustryStandardArchitecture).Mts ti liugi busPC lbusISA8bit th loinycphnbitr lISA16bit.Tcgi ca loibusny lcng tyIBM.Cng tynythitkrabusISA dngchomytnhATAdvancedTechnologydatrncscabx l 80286.immnh rntca loibusny lc th chophpcngmt lcx lhoctraoivi16bitdliunghalgpibusPC.

m bo tnh tng thch so vi bus PC ngi ta a thm vo mt rnh

cm th hai thng hng so vi rnh cm th nht v c cha36 tip imxp thnhhaihngmihng18 tip im.Trn rnh cmthhaiccha8bitdliuv4ngdnach.Nhvytrn bus ISA c tng cng 16 bit d liu v 24 bit a ch . Tc truynd liucquynhbitcnghcnh.

Nh vy trnbus ISA cmtbus d liu16 bitv chnhv l ikhibusnycngilbusISA16bitphnbitvibus8bitngoira ncn 24bitachchchophpqunl16Mbbnh.Gingnhbus PC,ncngsdngtcnghcnhnhngkhcvgitr,cth l8MHz.Mt li thrt lncacardmrngdngvibusPC l chng c th cm c vo rnh cm ISAbi v bus ISAbo m tnh tngthchk tha.C thnicardmrngISArtphbinbivchng thhinc tnhnnguvitivihuhtccngdngghp ni.


17/42

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CclinhkincsdngtrncardmrngISAthngrt r,chonncthni

trn thc t vic ghp nibng card m rng ISA t ra l mt cng ngh qua ththch v ng tin cy. ng dng tiubiucacardmrng ISA16bitc thkra l:cardvorani tipvsongsong,cardmthanh,cardmng...

Nhvy mbo tnh tng thchvi loibusPC8bit th rnh cm m rngISA 16 bit bao gm 2phn:Phn th nht ging ht rnh cm PC, cc tip im haimtcnhs theoAvB.Phn thhaibaogm36 tipimchia lm2hngmihng 18tipimnhslCvD.

unibusPCchuncchaccdyAvB.Trn dyAc20ach nhtA0n A19v8ngdndliuD0nD7.DyBcchaccngdnngtnhstIRQ0n IRQ7,ccngcpngunnuivccngdniukhinkhc.Phnrnhcmbxungbao gm2dyCvDtrncthm7ngdnach tA17nA23 v cc ng dn d liu t D8 n D15 v cc ng dn ngt t IRQ10 nIRQ14.NhvybusISA16bitcnhng cimchnhsau:

Sdngmtbusdliu16bittD0nD15. Mtbusach24bittA0nA23.TnhiuginhpCLKctl8,33MHz.Cc ng n SMENR v SMEMW dc s dng truyn d liu i vi 1

Mb thp nhtcabnh.Cthlt0nFFFFh.CncctnhiuMENRvMEMWc s dng truyn d liu trong vngb nh gia 1 Mb(FFFFFh) v 16Mb(FFFFFFh).Chnghnnukhi c tach 001000h thngdnSMENRclm cho hot ng mc thp, trong khi nu nh a ch l 1F0000h th ng dnSMENRclmchohotng.


18/42

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1.4.2. BUS PCI

TcgicabusPCI(PeripheralComponentInterconnection) lcng tyIntel.Cngtyny xydnglnmttiuchunghpnimictnlbusccbPCIhaythnggi tt lbus PCIdngchobxlPentium.Busnycthitkvichtiu: Tchotngnhanh.

Sbittruyntrnbuscao(64bit).Mcchlynhanhtctruynhppngnhucutngtctraoidliu

giabnh,bxl,biukhinavcardmnhnh.MtbvimchghpnicsdngcholoibusnylchipPCI82430chophp

ghpnitrc tipvibus.cim:Ging VESAchlcngtruyndliubngcchsdngnghh

thngnhnglithhinuimhnhnsovibusVESA lcthhotngchtrn32bit thmch chon64bit.Do tc truyncaonn trongccmy tnhccutrcbusPCI c thhnch cccardmrngghpnixungcn2hoc3rnh.Thngthngchccardmnhnhvcard iukhinacnglsdngbusPCI.Nudliuctruyn trongch64bitv tc ngh l33MHzthtc truyndliuccicthtn264Mbyte/s.phihpkh nngtruynhpcaccthitbkhcnhaulnbusPCIvbusISAngitasdngmtkhigil cuvoravbtrnhsau:


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Docthtruynch64bitcnghalbusPCItnhtphic64ngdndliu. VvybnhthngbusPCIckchthctngthmgpi.Tuyvy,kchthcthckhng thtngqumcvngitaphigiiquytbngcchtngmtchntrn1nvdintch. Chnhv lmchncmcabusPCIgnnhauhnvkhngcntngthchcvicc rnhcmPChocISA.

Tc truynccitrnbusnycthtti264Mbyte/s.Tuyvy,tcny

ch thc s t c khi dng phn mm 64 bit chy trn h thng c chab x lPentium.

CcrnhcmPCIu tinc lprptrnmainboardvibx l80486,mbx l nychsdngchhotng32bitdovycngchtntccci132Mbyte/s.

C th ni bus PCI l kt qu ci tin ca cc bus dng cho my tnh PC c sn, nhngvmtlogicthkhchnvibusISAvbusVESA.RnhcmPCIcrtnhiuchn:Loi 32 bit c 62 chn trn mi hng v tng cng 124 chn. Loi 64 bitc 94 chn x 2=188 chn. Thng thngbx lPentiumchyvi tcnghhthngl33MHzhoc50MHz.

Cn ch rng bus VESA ch c th hot ng tc truyn cc i ng vitns 33MHz.BilmtccchncmrnhcmmrngPCIvVESArtcao,chonnkhnng tch toracccardmrng trongiukinkhngchuynnghipghpniviccbus nylrtnh.Vvyhailoibusnykhngctrnhbychititmcdccmainboardc chtognydduchainbarnhcmmrngPCI.

1.4.4. Ghp ni qua khe cm m rngiu kin tin hnh: Phi c mt bn mch m rng, card phi hot ng tt. Phi c

phn mm ci t thch hp chnh thc ng k card vo trong h thng my tnh.Cch gii quyt:Mt s loicard m rng thng dng nh card modem, card m thanh, card vo ra th

chn gii php mua l thun li nht bi gi thnh gim m cht lng li m bo, l do lcc card c sn xut trong iu kin cng nghip s lng ln nn gi thnh h ngoi ra vic kim tra xut xng c tin hnh nghim chnh bi nh sn xut.

Vi mt s mc ch chuyn dng ngha l i tng ng dng tng i hp v slng cn khng nhiu th ta thng chn gii php t thit k v t lm, v d card dngtrong k thuto lng, thu thp s liu o lng, card iu khin i tng c th. C th vmt k thut khng phc tp lm nhng ngc li ta mua thng rt t hoc khng th tmmua c.

Trong k thut ghp ni thng dng thng ngi ta ch s dng rnh cm ISA 8 bithoc 16 bit. Trn cc bn mch chnh c ch to gn y thng cng c ba rnh cm ISA

16 bit t sn trn bn mch chnh. y chnh l ch np vo cc card bin i D/A v A/Dhoc l cc card to ra cc cng ghp ni khc nh to ra bus GPIB hoc RS -485... S dbus ISA c dng nhiu bi v n c cu trc cng nh kch thc hnh hc tng i ngin. Chnh v vy trong k thut ghp ni nhiu ti liu ch trnh by n loi rnh cm ny

CU HI V BI TPCu 1 : Tm hiu DTE v DCE v cc cch kt ni DTE vi DECCu 2 : Xc nh khun dng d liu v biu tn hiu khi truyn ra ngoi thng qua

cng COM chui k t : ACDEF.Cu 3: Xy dng th tc thit lp cc thng s cng COM.

Cu 4: Tm hiu ActiveX lp trnh cng COM.Cu 5: Tm hiu cc thanh ghi ca b UATR 8250


20/42

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Cu 6: Tm hiu c ch lp trnh cho UATR 8250.Cu 7 : Tm hiu HID trong vn lp trnh USB.Cu 8 : Trnh by cc bc thit lp thng s cng USBCu 9: Xy dng th tc xc nh v nh a cho cc thit b kt ni vi my tnh thng

qua cng USB.

Cu 10: Xy dng th tc cho php gi d liu ra ngoi qua 1 a ch cng USB cnh trc.Cu 11: Xy dng th tc cho php nhn d liu t ngoi vo qua 1 a ch cng USB

c nh trc.


21/42

- 20 -

Chng 2. BUS GHP NI A NNG

2.1. t vn Mt loi Bus c s dng nhiu trong cc h thng o lng vi cht lng cao l bus

ghp ni a nng, hay cn gi l bus GPIB (General Purpose Interface Bus). C th ni bGIPS l mt h bus chun cho php thit b o ca nhu hng khc nhau cng ghp ni

hnh thnh mt h o lng, kim tra v iu khin. tng khi xy dng bus IEE-488/GIPS l kt hp cc thit b o lng kim tra

dng trong cng nghip v thng mi, vi cc my tnh hnh thnh mt h thng theonhng ty chn khc nhau, c kh nng thc hin cc qu trnh kim tra v o lng di siu khin ca chng trnh my tnh, thng c vit bng BASIC.

2.2. Tiu chun IEEE-488 truyn thng

Cc mc logic trn bus ni chung u ging mc TTL : mc thp nh hn hoc bng

0.8V, trong khi mc cao ln hn 2V. Tn hiu logic c thc ni vi cc thit b o quady cp nhiu sik vi chiu di tng cng ti 20m. Thng thng cc thit b o phi t ccnhau t nht l 2m. Nu nh cc dy cp u c chiu di mc thp nht th chiu di tnh ram ca cc dy cp s gp 2 ln scc tht b c ghp ni trn h thng. Hu ht cc hthng IEEE-4888/ GPIB hot ng bnh thng vi tc truyn 250 kbyte/s hoc nhanh hnnu chp nhn 1 s hn ch c th.

Bus GPIB bao gm 24 ng dn, cc ng ny c ni vi u ni 24 chn. Ccthit b o lng v kim tra c d tnh dng vi bos GPIB u c lp sn mt s uni 24chn mt sau. ng thi cng c 1 chuyn mch 2 hng (DIP) nh a ch cho busGPIB c lp sau mt sau, thng ngay cnh u ni. Nhim v ca chuyn mch l ta ch nh phn 5bit, m thit b c nh v tr trong h thng, c th quyt nh : choc khng c thit b, hoc ch l mt thnh vin nghe hoc ch l thnh vin ni v quy nhmt s chi tit c th khc.

i tng

cn kim tra

My pht tnhiu

Thit b oa nng

My o cngsut RF

My o tns

Giao din GPIB

My tnh


22/42

- 21 -

2.3. Cu hnh v hot ng ca Bus GPIBH thng IEE 488/GPIB c th c chia ra 2 loi cu hnh c bn : ni tip v hnh

sao. Cc cu hnh dng ny c to ra nh cch u ni dy cp gia cc thnh vin ca busc th (gia cc thit b o lng v my tnh iu khin). Cu hnh theo kiu ni tip ghpni cc thit b thnh mt dy k tip nhau, trong o u ni cho mt thit b o tip theoc cm vo u ni ca mt thit o ng trc y. Trong cu hnh dng sao, cc thit b

c ni t mt im chung.

Cc bus trong h thnga IEEE-488/GPIB c th chia thnh 3 loi : bus d liu, bus bttay v bus qun l. Mi ng dn trong tng bus u c 1 vch in tng t vi mchin. Ben cnh it bo v mc song song vo in dung phn b k sinh, cng c cc intr ni ln ngun v ni xung mass, xc iinh mt cc c hiu qu tr khng li va tiuchun ha.

GPIB

8 ngd liu

3 ngbt tay

5 ng qun lgiao din

Ni t

Cc ng tnhiu


23/42

- 22 -

BUS

B iu khin

B nhn

Vcc

c ni ti ng bus l cc mch in ca thnh vin nhn v cc mch in ca biu khin. Cc mch ny tng t vi cc phn t logic TTL, bo m vic nhp vo v xutd liu ra cc thit b o. B iu khin c mt li ra u vo bus v c thit k trn c s

mt kinh kin 3 trng thi. Linh kin s khngphn ng g cho n khi c lnh ng mch.Nh vy, li ra 3 trng thi s tri ni tr khng cao cho n khi c ng mch. B nhnl 1 b m khng o vi li vo tr khng cao.

Cch b tr ca cc b iu khin v cc b nhn theo cch ny bo m c oc nhti thp t bus v y l l do v sao c th u nhiu mch ti vo mt ng bus.

CU HI V BI TP1. Trnh by tiu chun IEEE-488 truyn thng2. Trnh by cu hnh v hot ng ca Bus GPIB


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Chng 3. VNG O IN P

3.1.Truyn d liu bng vng dng inThay cho vic dng mc ien p, vic truyn d liu cn c th c tin hnh nh s

chuyn mc dng in (thay i gi tr dng in).

C th tm hiu vng dng in thng qua v d v th l vng dng in 20 mA. Giaodin vng dng 20 mA ra i trc khi RS-232 c xem l mt tiu chun. Giao din nycn c gi l giao din TTY hoc thng c gi l vng dng in, m t trng thilogin qua tc ng cho khng cho 1 dng in vi cng 20mA i qua, ngha l vic gid liu c th quan nim 1 cch n gin nh vic ng mch cho dng ien chy qua.Giao din dng 20mA c chia thnh 2 phn : ch ng (c ngun dng khng i 20 mA)v b ng ( ngun dng khng i 20 mA c to ra pha thit b ghp ni). Nh vy, baogi cngmt trong cc thnh vin kia l b ng. c th ch ng to thnh mt mch kni vi dng in loi giao din dng 20 mA dng cho my tnh PC c cha 1 b bin iDC/DC, qua giao din cung cp ng lng 2 chn ni cc vng gi v nhn c thhot ng

giao din dng 20 mA c nhng tn hiu sau : - TxD (+) d liu gi (ng dn v)- TxD (-) d liu gi (ng dn i)- RxD (+) d liu nhn (ng dn i)- RxD (-) d liu nhn (ng dn v)Thng thng th giao din dng 20 mA khng c tn hiu dng bt tay khi thit

lp ng truyn. Vi giao din ny, vic truyn d liu trn khong cch c 1.000m honton c th thc hin c bi v nhiu sinh ra trn ng truyn nh hng cm ng ln cng dn tn hiu i cng nh n v do vy b loi tr. Mun th ng dn i v ngdn v phi t st nhau, sao cho khi mt tn hiu nhiu xut hin th cng nh hng ln c 2

ng tn hiu, chng hn c th dng loi 2 dy xon vi nhau lm ng truyn. Tt nhinl vi cch giao tip ny khng th c c tc truyn cao.

3.2. Vng dng in 60mAH thng dng 60 mA c m t theo hnh v di cho thy mt trong cc my in

bo in ch c th c ni vi cng li ra ni tip tng thch TTL nh th no. Trong nhiutrng hp, mt bit ca mt cng song song s c cu hnh nh 1 cng ni tip thng quahoc l phn mm hoc l b sung thm cho phn cng. Bit c thp nht (LSB) ca cng songsong c ch nh nh u ra ni tip.

Mc TTL t cng ra ni tip iu khin cc gc ca tranzito cng sut NPN, chu in

p cao. Hai cc gp pht ca tranzito c u ni tip vi vng dng in 60 mA v nhvy n hot ng nh mt chuyn mch (cng tc). Khi mc TTL l HIGH, tranzito T1 mv dng in chy trong vng. Ngc li, khi bit TTL l LOW, tranzito chuyn sang trngthi cm v s khng c dng in i qua mch. Do , tranzito cung cp mt mc logic 1,khi bit TTL l HIGH, mc logic 0 khi l LOW.

Vng dng in c nui t ngun mt chiu 120 140 V, c mt bin tr iu chnhc mc ni tip, uwocj s dng t gn ng mc dng in.

Mc dng in trong vng ien 60mA c iu chnh bng cch ngt vng v chnvo mch mt mili ampe k vi thang o 0 100 mA.

Mt phm s c nhn trn bn phm, mtmc HIGH phi c vit vo cng li rani tip. Tc ng ny s ng mch vng v cho php dng i qua. Chit p R2, c nivi bin tr, khi s tin hnh iu chnh cho dng in i qua xp x 60mA


25/42

- 24 -

Khi dng 60 mA vht qua cc cun dy s to ra mt t trng xung quanh tng cun.Khi bt ng lm gin on dng in s lm cho t trng gim t ngt v xut hin 1 xungin p cao do hin tng cm ng in t. Kt qu l xung in p ny co th lm hng cclinh kin bn dn v ta phi ngh n kh nng a ra cc bin php bo v. Chc nng nyc it D1 m nhim, it ny l loi chnh lu c in p ngc tnh theo nh bng1000V (PIV). Bnh thng it D1 c thin p ngc, ch tr khi xung in p xut hinny mi b phn cc thun v dp t ngay xung in ny trc khi n kp gy hi.

3.3. Vng dng in 20mA

Chun vong dng ien mi hn s dng dong in vi cng 20 mA chomclogic 1 v dng in 0 cho n 2mA cho mc logic 0. Vng dng in 20mA c sdng trn my in bo in ch Model 33 c ttt c cc kiu my k tip. Cc my s dngdng 20mA u s dng m ASCII.

Hnh trn ch ra 1 phng php n gin cho php s dng b ghp ni quang ghpni cng truyn ni tip ca my tnh vi mt vng dng in 20 mA. Khi li vo d liu lHIGH, c ngha 1 trng thi nh du mc logic 1, th li ra ca b o cc gp h (U1) s

+Li ra 20 mA

-

D1IN400

IC 1

+5 V DC

R1220

D liuu vo

U1

T1MJE340

R1220

My in

bo 60 WPM

X

Cng li raTTL, LBS

D1IN4007 R2

Ngun nui130 V DC


26/42

- 25 -

chuyn sang mc LOW, do cc m ca it pht quang s ni t. Tc ng ny s lmm tranzito, v cho php dng in i qua mch. Li mt ln na, mt it hot ng trongch phn cc ngc c s dng ngn nga hng hc v cc phin phc khc gy ra

bi xung in cm ng pht sinh khi cc cun dy phng in.

3.4. Vng dng in 4 n 20mA

Trong k thut iu khin cc qu trnh cng nghip, ngi ta thng s dng h thngvng dng in truyn cc s liu o lng. Hnh trn th hin 1 h thng tiu biu, trong 3 thit b khc nhau thc hin nhim v trong cng 1 vng dng in.

Trn mt s b ch th dng in di dng s ang lu hnh trn th trng, ta thy di

o khng phait l 0-20 mA m l 4-20 mA. Cc b ch th ny cho php t 4 mA n 20 mA.Mc ch ca vic s dng vng dng in ny l truyn cc gi tr nm trong 1 vng, m tcc thng s ang c o. Ton b vng c rng l 10 mA, nhng do vic chn gi trnh nht l 4 mA c th tng dng in cc i n 20 mA. Nguyn nhn ca s lch, vcung l mt trong nhng u im ca vng dng in 4-20 mA so vi cc vng dng inkhc l trng thi li vo 0 c biu din bi 1 dng in khc 0, c th l 4 mA. Do ,trong vng dng in 4 - 20 mA c th d dng phn bit gia 1 gi tr tham s 0 v trng thidng in bng 0 do c s c trn mch vng (chp mch hoc t mch) lm mt i tn hiudng in.

CU HI V BI TP1. Trnh by vng dng in 60mA2. Trnh by vng dng in 20mA3. Trnh by vng dng in 4 n 60mA

Vng dng 4 - 20 mAVin 0 B bin i in

p ra dng in

My ghi Anlalog My ghi Anlalog My ghi Anlalog


27/42

- 26 -

Chng 4. CC MCH IU KHIN VI B BIN I A/D

4.1. Card bin i A/D 12 bit dng ICL7107Nhiu ngi s dng my tnh quan tm n ng dng trong o lng v iu khin,

nhng bt tay vo cng vic cn c thm nhng phn cng thch hp, ng vai tr ghpni trung gian gia my tnh v phn cng bn ngoi. Mt b phn khng th thiu c l

card bin i A/D v D/A m l do n gin l cc tn hiu m t lnh, trng thi hoc dliu trong my tnh u tn ti di dng s.

Cc thng s c trng :- Cho php thc hin 8 php o trong 1 giy khi hot ng trong ch 1 knh. Trongch 8 knh th mi php o mt giy.

- Cung cp cc gi tr o trong vng t -1999 n +1999.- phn gii tng ng vi 12 bit, ngha l 4096bc hoc 2048 bc.

- C kh nng nhn dng trng thi vt qu gii hn o.- C li vo vi phn, c th l c th o in p gia 2 li vo analog.

Card c m rng sao cho sau khi kt thc 1 qu trnh bin i A/D th mt ngt cxa v chng trnh chy trn my tnh c th x l ngay gi tr o, ngoi ra vic thu thp ktqu o lng c th tin hnh ngay sau my tnh, ngha l trong khi my tnh thc hi cccng vic khc.

S khi :

4.2. Card bin i A/D 12 bit dng ADC547

u im ca ADC 547 :- in tr li vo ln- Vng in p li vo rt rng- Kh nng inh a ch phong ph

- Tt c cc tc ng u c iu khin bng phn mm- Gi thnh khng cao

in p nui ngun

BusPC8

bit

B mbus

Khiiukhinlogic vgii ma ch

in pso snh

B bin iA/D

+

-

.

.

.

.

.

.

.

.

In +

In -


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- Mch in c phc tp va phi

Cc thng s c trng :- C kh nng ghp ni qua khe cm PC- B bin i A/D c 12 bt

- Thi gian bin i 25 micro giy

- C 16 li vo hot ng ch dn knh- in p li vo 0 5 +V hoc -2V - + 2V- C in p so snh 10v bn trong

- a ch c bn ca card v vng in p li vo c t bng cu ni (jumper) - iu khin cc qu trnh trn card bng PPI ph dng 8255

- C 8 li vo/ra vi mc analog- Dng in tiu th 200 mA ly t khe cm m rng ca my tnh

4.3. Card bin i ADA 9-16 bit

Card ADA 9-16bit c 8 li vo v 8 li racho php card m rng c th s dng trongnhiu mc ch o lng v iu khin vi chinh xc cao.

Cc c im chnh :- phn gii cao : 9- 16 bit- chnh xc cao nhtl 0.05% khi tc bin i l 4 php o mi giy- Bng kh nng lp trnh, c th n inh phn gii bng 9 bit, khi tc bin i

c 500 php o mi giy. Trc khi n b bin i A/D, tn hiu qua b dn knhvi 8 knh, v th c tng cng n 8 in p li vo c th x l c.

Khi xut ra, b bin i ADA 16 c mt bin i s / tng t vi phn gii 12 bitv chnh xc l 0.025%, c m rng bng mt mch ly mu v gi. Nh vy c

tng cng 8 in p li vo c xl cng nh 8 in p analog c xut ra. Cc diin p u nm trong vng -2v n + 2v.

S khi :Mch in ca card bin i ADA 9-16 bit c 3 phn vi 3 chc nng khc nhau :

-B gii m a ch v m d liu -B bin i tng t/ s cng vi bdn knh t pha trc-B bin i s/ tng t cng vi b dn knh/ m t pha sau

B gii m a ch vo/ra gii m 4 a ch vo/ra k tipnhau iu khin cc linhkin khc nhau ca card ghp ni. Ngoi ra, b gii m ny cn iu khin vic

chuyn hng dng cho b m bus d liu, ni cc ng dn d liu ca mytnh vi cc ng dn d liu ca b bin i ca A/D cng nh D/A


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Phnth 2 l b bin i tng t/s c b tr sau b dn knh 8 li va, ngoi racn c mch in iu chnh phn gii cho php n nh chnh xc ca b bin itrong tng trng hp c th. chnh xc cng cao th s lng php o c thc hintrong mt n v thi gian cng nh. c phn gii l 16 bit th thi gian bin i chomi gi tr o c 260 ms, tng ng tc x l l 4 php o mi giy. Khi chn phngii bng 9 bit c ti c 500 php o c thc hin trong 1 giy. Tm knh li vo c xl k tip nhau qua b dn keenh v c nh gi nh lng bng b bin i A/D

CU HI V BI TP1. Trnh by Card bin i A/D 12 bit dng ICL7107 2. Trnh by Card bin i A/D 12 bit dng ADC5473. Trnh by Card bin i ADA 9-16 bit

B dn knh

B bin i D/A

-2 V . . . 0 V . . . + 2 V -2 V . . . 0 V . . . + 2 V

B dn knh

B bin i A/D c

iu khin

B

phngii

B gii m a ch v m d liu

Bus my tnh


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Chng 5. TNG HA VI PCL S7-200

5.1. B iu khin kh trnh PCLHnh thnh t nhm cc k s hng General Motors nm 1968 vi tng ban u l thit k mt b iu khin tha mn cc yu cu sau:

- Lp trnh d dng, ngn ng lp trnh d hiu.

- D dng sa cha thay th.- n nh trong mi trng cng nghip.- Gi c cnh tranh.Thit b iu khin logic kh trnh (PLC: Programmable Logic Control) l loi thit b

cho php thc hin linh hot cc thut ton iu khin s thng qua mt ngn ng lp tr nh,thay cho vic th hin thut ton bng mch s.

Nh vy, vi chng trnh iu khin trong mnh, PLC tr thnh b iu khin s nh

gn, d thay i thut ton v c bit d trao i thng tin vi mi trng xung quanh (vicc PLC khc hoc vimy tnh). Ton b chng trnh iu khin c lu nh trong bnh PLC di dng cc khi chng trnh (khi OB, FC hoc FB) v thc hin lp theo chuk ca vng qut.

c th thc hin c mt chng trnh iu khin, tt nhin PLC phi c tnh nngnh mt my tnh, ngha l phi c mt b vi x l (CPU), mt h iu hnh, b nh luchng trnh iu khin, d liu v cc cng vo/ra giao tip vi i tng iu khin v

trao i thng tin vi mi trng xung quanh. Bn cnh , nhm phc v bi ton iu khins, PLC cn cn phi c thm cc khi chc nng c bit khc nh b m (Counter), bnh th (Timer) v nhng khi hm chuyn dng.


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5.2. Son tho chng trnh vi PCLCc loi PLC ni chung thng c nhiu ngn ng lp trnh nhm phc v cc i

tng s dng khc nhau. PLC S7-300 c 5 ngn ng lp trnh c bn. l:

Ngn ng hnh thang, k hiu l LAD (Ladder logic).

y l ngn ng ho thch hp vi nhng ngi quen thit k mch logic.


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Ngn ng lit k lnh,k hiu l STL (Statement list).y l dng ngn ng lp trnh thng thng ca my tnh. Mt chng trnh c

ghp gi nhiu cu lnh theo mt thut ton nht nh, mi lnh chim mt hng v u ccu trc chung l tn lnh + ton hng.

Ngn ng hnh khi, k hiu l FBD (Function Block Diagram).

y cng l ngn ng ho thch hp vi nhng ngi quen thit k mch iu khin

s.Ngn ng GRAPH.y l ngn ng lp trnh cp cao dng ho. Cu trc chng trnh r rng, chng

trnh ngn gn. Thch hp cho ngi trong ngnh c kh vn quen vi gin Grafcet ca khnn.


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Ngn ng HIGH GRAPH.

CU HI V BI TP1. Trnh by B iu khin kh trnh PCL2. Thc hnh lp trnh PLC


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Chng 6. HVI IU KHIN 8951

6.1. Cu trc phn cng8951 c tt c 40 chn c chc nng nh cc ng xut nhp. Trong c 24 chn c

tc dng kp (c ngha l 1 chn c 2 chc nng), mi ng c th hot ng nh ngxut nhp hoc nh ng iu khin hoc l thnh phn ca cc bus d liu v bus a ch.

Cc Port:

Port 0:Port 0 l port c 2 chc nng cc chn 32 - 39 ca 8951. Trong cc thit k c nh

khng dng b nh m rng n c chc nng nh cc ng I/O. i vi cc thit k c lnc b nh m rng, n c kt hp gia bus a ch v bus d liu.

Port 1:

Port 1 l port I/O trn cc chn 1-8. Cc chn c k hiu P1.0, P1.1, p1.2, ... p1.7 cth dng cho giao tip vi cc thit b ngoi nu cn. Port 1 khng c chc nng khc, v vychng ch c dng cho giao tip vi cc thit b bn ngoi.

Port 2:

Port 2 l 1 port c tc dng kp trn cc chn 21 - 28 c dng nh cc ng xut

nhp hoc l byte cao ca bus a ch i vi cc thit b dng b nh m rng.

U2

AT89C51

9

18

19 29

30

31

1

2

3

4

5

6

7

8

21

22

23

24

25

26

2728

10

11

12

13

14

15

16

17

39

38

37

36

35

34

3332

RST

XTAL2

XTAL1 PSEN

ALE/PROG

EA/VPP

P1.0

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

P2.0/A8

P2.1/A9

P2.2/A10

P2.3/A11

P2.4/A12

P2.5/A13

P2.6/A14

P2.7/A15

P3.0/RXD

P3.1/TXD

P3.2/INTO

P3.3/INT1

P3.4/TO

P3.5/T1

P3.6/WR

P3.7/RD

P0.0/AD0

P0.1/AD1

P0.2/AD2

P0.3/AD3

P0.4/AD4

P0.5/AD5

P0.6/AD6

P0.7/AD7


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Port 3:

Port 3 l port c tc dng kp trn cc chn 10-17. Cc chn ca port ny c nhiu chcnng, cc cng dng chuyn i c lin h vi cc c tnh c bit ca 8951 nh bng sau:

Bit Tn Chc nng chuyn i

P3.0 RXT Ng vo d liu ni tip.P3.1 TXD Ng xut d liu ni tip.

P3.2 INT0\ Ng vo ngt cng th 0P3.3 INT1\ Ng vo ngt cng th 1P3.4 T0 Ng vo caTIMER/COUNTER th 0.

P3.5 T1 Ng vo caTIMER/COUNTER th 1.P3.6 WR\ Tn hiu ghi d liu ln b nh ngoiP3.7 RD\ Tn hiu c b nh d liu ngoi.

Cc ng tn hiu iu khin:Ng tn hiu PSEN (Program store enable):PSEN l tn hiu ng ra chn 29 c tc dng cho php c b nh chng trnh m

rng thng c ni n chn OE\(output enable) ca Eprom cho php c cc byte mlnh.

PSEN mc thp trong thi gian Microcontroller 8951 ly lnh. Cc m lnh cachng trnh c c t Eprom qua bus d liu v c cht vo thanh ghi lnh bn trong8951 gii m lnh. Khi 8951 thi hnh chng trnh trong EPROM ni PSEN s mclogic 1.

Ng tn hiuiu khin ALE (Address Latch Enable)

Khi 8951 truy xut b nh bn ngoi, port 0 c chc nng l bus a ch v bus d liudo phi tch cc ng d liu v a ch. Tn hiu ra ALE chn th 30 dng lm tnhiu iu khin gii a hp cc nga ch v d liu khi kt ni chng vi IC cht.

Tn hiu ra chn ALE l mt xung trong khong thi gian port 0 ng vai tr l ach thp nn cht a ch hon ton t ng.

Cc xung tn hiu ALE c tc bng 1/6 ln tn s dao ng trn chip v c th cdng lm tn hiu clock cho cc phn khc ca h thng. Chn ALE c dng lm ng voxung lp trnh cho EPROM trong 8951.

Ng tn hiu EA\(External Access):

Tn hiu vo EA\ chn 31 thng c mc ln mc 1 hoc mc 0. Nu mc 1,8951 thi hnh chng trnh t EPROM ni trong khong a ch thp 4 Kbyte. Nu mc 0,8951 s thi hnh chng trnh t b nh m rng. Chn EA\c ly lm chn cp ngun12V khi lp trnh cho Eprom trong 8951.

Ng tn hiu RST (Reset) :Ng vo RST chn 9l ng vo Reset ca 8951. Khi ng vo tn hiu ny a ln cao

t nht l 2 chu k my, cc thanh ghi bn trong c np nhng gi tr thch hp khing h thng. Khi cp in mch t ng Reset.

Cc ng vo b dao ng X1,X2:B dao ng c ctch hp bn trong 8951, khi s dng 8951 ngi thit k ch

cn kt ni thm thch anh v cc t nh hnh v trong s . Tn s thch anh thng sdng cho 8951 l 12Mhz.Chn 40 (Vcc) c ni ln ngun 5V.


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6.2. Tp lnhTp lnh h MSC-51 c s kim tra ca cc mode nh v v cc lnh ca chng c

cc Opcode 8 bit. iu ny cung cp kh nng 28= 256 lnh c thi hnh v mt lnh khngc nh ngha. Vi lnh c 1 hoc 2 byte bi d liu hoc a ch thm vo Opcode. Trongton b cc lnh c 139 lnh 1 byte, 92 lnh 2 byte v 24 lnh 3 byte.

Cc mode nh v (Addressing Mode) :Cc mode nh v l mt b phn thng nht ca tp lnh. Chng cho php nh r

ngun hoc ni gi ti ca d liu cc ng khc nhau ty thuc vo trng thi ca ngilp trnh. 8951 c 8 mode nh v c dng nh sau: Thanh ghi. Trc tip. Gin tip. Tc thi. Tng i. Tuyt i. Di. nh v.

Cc kiu lnh (Instruction Types):8951 chia ra 5 nhm lnh chnh:

Cclnh s hc.ADD A,

ADD A, Rn : (A) (A) + (Rn)

ADD A, direct : (A) (A) + (direct)

ADD A, @ Ri : (A) (A) + ((Ri)) ADD A, # data : (A) (A) + # data

ADDC A, Rn : (A) (A) + (C) + (Rn)

ADDC A, direct : (A) (A) + (C) + (direct)

ADDC A, @ Ri : (A) (A) + (C) + ((Ri))

ADDC A, # data : (A) (A) + (C) + # data

SUBB A, SUBB A, Rn : (A) (A) - (C) - (Rn)

SUBB A, direct : (A) (A) - (C) - (direct)

SUBB A, @ Ri : (A) (A) - (C) - ((Ri))

SUBB A, # data : (A) (A) - (C) - # data

INC

INC A : (A) (A) + 1

INC direct : (direct) (direct) + 1

INC Ri : ((Ri)) ((Ri)) + 1

INC Rn : (Rn) (Rn) + 1

INC DPTR : (DPTR) (DPTR) + 1

DEC DEC A : (A) (A) - 1

DEC direct : (direct) (direct) - 1


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DEC @Ri : ((Ri)) ((Ri)) - 1

DEC Rn : (Rn) (Rn) - 1

MULL AB : (A) LOW [(A) x (B)];c nh hng c OV: (B) HIGH [(A) x (B)];c Cary c xa.

DIV AB : (A) Integer Result of [(A)/(B)]; c OV

: (B) Remainder of [(A)/(B)]; c Carry xa DA A :iu chnh thanh ghi A thnh s BCD ng trong php cng

BCD (thng DA A i km vi ADD, ADDC)

Nu [(A3-A0)>9] v [(AC)=1] (A3A0) (A3A0) + 6.Nu [(A7-A4)>9] v [(C)=1] (A7A4) (A7A4) + 6.

Lnh logic.Tt c cc lnh logic s dng thanh ghi A nh l mt trong nhng ton hng thc thi

mt chu k my, ngoi A ra mt 2 chu k my. Nhng hot ng logic c th c thc hintrn bt k byte no trong v tr nh d liu ni m khng qua thanh ghi A.

Cc hot ng logic c tm tt nh sau:

ANL ANL A, Rn : (A) (A) AND (Rn).

ANL A, direct : (A) (A) AND (direct).

ANL A,@ Ri : (A) (A) AND ((Ri)).

ANL A, # data : (A) (A) AND (# data).

ANL direct, A : (direct) (direct) AND (A).

ANL direct, # data : (direct) (direct) AND # data.

ORL ORL A, Rn : (A) (A) OR (Rn).

ORL A, direct : (A) (A) OR (direct).

ORL A,@ Ri : (A) (A) OR ((Ri)).

ORL A, # data : (A) (A) OR # data.

ORL direct, A : (direct) (direct) OR (A).

ORL direct, # data : (direct) (direct) OR # data.

XRL XRL A, Rn : (A) (A) (Rn).

XRL A, direct : (A) (A) (direct). XRL A,@ Ri : (A) (A) ((Ri)).

XRL A, # data : (A) (A) # data.

XRL direct, A : (direct) (direct) (A).

XRL direct, # data : (direct) (direct) # data.

CLR A : (A) 0

CLR C : (C) 0

CLR Bit : (Bit) 0

RL A : Quay vng thanh ghi A qua tri 1 bit

(An + 1) (An); n = 06

(A0) (A7)

RLC A : Quay vng thanh ghi A qua tri 1 bit c c Carry


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(An + 1) (An); n = 06

(C) (A7)

(A0) (C)

RR A : Quay vng thanh ghi A qua phi 1 bit

(An + 1) (An); n = 06

(A0) (A7) RRC A : Quay vng thanh ghi A qua phi 1 bit c c Carry

(An + 1) (An); n = 06

(C) (A7)

(A0) (C)

SWAP A : i ch4 bit thp v 4 bit cao ca A cho nhau (A3A0)(A7A4).

Dch chuyn d liu.Cc lnh dch chuyn d liu trong nhng vng nh ni thc thi 1 hoc 2 chu k my.

Mu lnh MOV , cho php di chuyn d liu bt k 2 vng nh noca RAM ni hoc cc vng nh ca cc thanh ghi chc nng c bit m khng thng quathanh ghi A.

Vng Ngn xp ca 8951 ch cha 128 byte RAM ni, nu con tr Ngn xp SP ctng qu a ch 7FH th cc byte c PUSH vo s mt i v cc byte POP ra th khng bitr.

Cc lnh dch chuyn b nh ni v b nh ngoi dng s nh v gin tip. a chgin tip c th dng a ch 1 byte (@ Ri) hoc a ch 2 byte (@ DPTR). Tt c cc lnhdch chuyn hot ng trn ton b nh ngoi thc thi trong 2 chu k my v dng thanh ghiA lm ton hng DESTINATION.

Vic c v ghi RAM ngoi (RD v WR) ch tch cc trong sut qu trnh thc thi calnh MOVX, cn bnh thng RD v WR khng tch cc (mc 1).Tt c cc lnh dch chuyn u khng nh hng n c. Hot ng ca tng lnh

c tm tt nh sau: MOV A,Rn : (A) (Rn)

MOV A, direct : (A) (direct)

MOV A, @ Ri : (A) ((Ri))

MOV A, # data : (A) # data

MOV Rn, A : (Rn) (A)

MOV Rn, direct : (Rn) (direct) MOV Rn, # data : (Rn) # data

MOV direct, A : (direct) (A)

MOV direct, Rn : (direct) (Rn)

MOV direct, direct : (direct) (direct)

MOV direct, @ Ri : (direct) ((Ri))

MOV direct, # data : (direct) data

MOV @ Ri, A : ((Ri)) (A)

MOV @ Ri, direct : ((Ri)) (direct)

MOV @ Ri, # data : ((Ri)) # data MOV DPTR, # data16 : (DPTR) # data16

MOV A, @ A + DPTR : (A) (A) + (DPTR)


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MOV @ A + PC : (PC) (PC) + 1

(A) (A) + (PC)

MOVX A, @ Ri : (A) ((Ri))

MOVX A, @ DPTR : (A) ((DPTR))

MOVX @ Ri, A : ((Ri)) (A)

MOVX @ DPTR, A : ((DPTR)) (A)PUSH direct : Ct d liu vo Ngn xp

(SP) (SP) + 1

(SP) (Drirect)

POP direct : Ly t Ngn xp ra direct

(direct) ((SP))

(SP) (SP) - 1

XCH A, Rn : i ch ni dung ca A vi Rn

(A) (Rn)

XCH A, direct : (A) (direct)

XCH A, @ Ri : (A) ((Ri))

XCHD A, @ Ri : i ch4 bit thp ca (A) vi ((Ri))

(A3A0) ((Ri3Ri0))

L lun.8951 cha mt b x l lun l y cho cc hot ng bit n, y l mt im mnh

ca h vi iu khin MSC-51 m cc h vi iu khin khc khng c.RAM ni cha 128 bit n v v cc vng nh cc thanh ghi chc nng c bit cp ln

n 128 n v khc. Tt c cc ng Port l bit nh v, mi ng c th c x l nhPort n v ring bit. Cch truy xut cc bit ny khng ch cc lnh r nhnh khng, m lmt danh mc y cc lnh MOVE, SET, CLEAR, COMPLEMENT, OR, AND.

Ton b s truy xut ca bit dng s nh v trc tip vi nhng a ch t 00H - 7FHtrong 128 vng nh thp v 80H - FFH cc vng thanh ghi chc nng c bit.

Bit Carry C trong thanh ghi PSW\ca t trng thi chng trnh v c dng nh mts tch ly n ca b x l lun l. Bit Carry cng l bit nh v v c a ch trc tip v nnm trong PSW. Hai lnh CLR C v CLR CY u c cng tc dng l xa bit c Carry nhnglnh ny mt 1 byte cn lnh sau mt 2 byte.

Hot ng ca cc lnh lun l c tm tt nh sau:CLR C : Xa c Carry xung 0. C nh hng c Carry.

CLR BIT : Xa bit xung 0. Khng nh hng c Carry

SET C : Set c Carry ln 1. C nh hng c Carry.

SET BIT : Set bit ln 1. Khng nh hng c Carry.

CPL C : o bit c Carry. C nh hng c Carry.

CPL BIT : o bit. Khng nh hng c Carry.

ANL C, BIT: (C) (C) AND (BIT) : C nh hng c Carry.

ANL C, /BIT :(C) (C) AND NOT (BIT):Khng nh hng c Carry.

ORL C, BIT: (C) (C) OR (BIT) : Tc ng c Carry.ORL C, /BIT: (C) (C) OR NOT (BIT) : Tc ng c Carry.


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MOV C, BIT: (C) (BIT) : C Carry b tc ng.

MOV BIT, C: (BIT) (C) : Khng nh hng cCarry.

R nhnh chng trnh.C nhiu lnh iu khin ln chng trnh bao gm vic gi hoc tr li t chng

trnh con hoc chia nhnh c iu kin hay khng c iu kin.Tt c cc lnh r nhnh u khng nh hng n c. Ta c th nh nhn cn nhy ti

m khng cn r a ch, trnh bin dch s t a ch ni cn nhy ti vo ng khu lnh a ra.

Sau y l s tm tt tng hot ng ca lnh nhy. JC rel : Nhy n rel nu c Carry C = 1.

JNC rel : Nhy n rel nu c Carry C = 0.

JB bit, rel : Nhy n rel nu (bit) = 1.

JNB bit, rel : Nhy n rel nu (bit) = 0.

JBC bit, rel : Nhy n rel nu bit = 1 v xa bit.

ACALL addr11: Lnh gi tuyt i trong page 2K.

(PC) (PC) + 2

(SP) (SP) + 1

((SP)) (PC7PC0)

(SP) (SP) + 1

((SP)) (PC15PC8)

(PC10PC0) page Address.

LCALLaddr16: Lnh gi di chng trnh con trong 64K.

(PC) (PC) + 3(SP) (SP) + 1

((SP)) (PC7PC0)

(SP) (SP) + 1

((SP)) (PC15PC8)

(PC) Addr15Addr0.

RET : Kt thc chng trnh con tr v chng trnh chnh.

(PC15PC8) (SP)

(SP) (SP) - 1

(PC7PC0) ((SP))(SP) (SP) -1.

RETI : Kt thc th tc phc v ngt quay v chng trnh chnh hotng tng t nh RET.

AJMP Addr11 : Nhy tuyt i khng iu kin trong 2K.

(PC) (PC) + 2

(PC10PC0) page Address.

LJMP Addr16 : Nhy di khng iu kin trong 64K

Hot ng tng t lnh LCALL.

SJMP rel :Nhy ngn khng iu kin trong (-128127) byte(PC) (PC) + 2

(PC) (PC) + byte 2


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JMP @ A + DPTR:Nhy khng iu kin n a ch (A) + (DPTR)

(PC) (A) + (DPTR)

JZ rel : Nhy n A = 0. Thc hnh lnh k nu A 0.

(PC) (PC) + 2

(A) = 0 (PC) (PC) + byte 2

JNZ rel : Nhy n A 0. Thc hnh lnh k nu A = 0.(PC) (PC) + 2

(A) < > 0 (PC) (PC) + byte 2

CJNE A, direct, rel : So snh v nhy n A direct

(PC) (PC) + 3

(A) < > (direct) (PC) (PC) + Relative Address.

(A) < (direct) C = 1

(A) > (direct) C = 0

(A) = (direct). Thc hnh lnh k tip

CJNE A, # data, rel : Tng t lnh CJNE A, direct, rel.CJNE Rn, # data, rel : Tng t lnh CJNE A, direct, rel.

CJNE @ Ri, # data, rel : Tng t lnh CJNE A, direct, rel.

DJNE Rn, rel : Gim Rn v nhy nu Rn 0.

(PC) (PC) + 2

(Rn) (Rn) -1

(Rn) < > 0 (PC) (PC) + byte 2.

DJNZ direct, rel : Tng t lnh DJNZ Rn, rel.

CU HI V BI TP1. Trnh by Cu trc phn cng vi iu khin 89512. Thc hnh lp trnh cho vi iu khin 8951


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THI MU 1 :Cu 1:Nu cu trc cng, ngha cc chn cm ca cng LPT.

Xc nh khun dng d liu ca cng COM l bao nhiu khi truyn i 5 k tEFGHIvi 1 bit start,8bit a,1 bit Parity, 2 bit stop?

Cu 2:

Lp trnh cho cc n LED ni vi cng LPTtheo s bn ln lt thay nhau pht sng theo chuk 2 giy.

Cu 3 : Xy dng th tc cho php qut v cp pht ID cho cc thit b ng c uni giao din kt ni USB ca my tnh

Gi p n

Cu 1 : Lit k danh sch cc chn tn hiu (tn, s hiu chaanm chiu, ngha chntn hiu)

Chuyn i chui k t sang m ASCIII 8bit , xc nh khun dng d liu, v s tn hiu.

Cu 2 : Xc nh thanh ghi no cn s dng cng nh cc gi tr ca thanh ghi theocc yu cu ca bi, tin hnh vit on chng trnh a np gi tr vo cc thanh ghithng qua cc thng s c xc nh trc tng ng vi yu cu bi.

Cu 3 : S dng cc hm v th tc API v HID xy dng chng trnh.

2 :Cu 1:Nu cu trc u cm, cp ni ca Bus ghp ni a nng ni tip.

Xc nh khun dng d liu ca cng COM l bao nhiu khi truyn i 5 k tABCDEvi 1 bit start,8bit a,1 bit Parity, 1 bit stop

Cu 2:

Lp trnh cho cc n LED ni vi cng LPTtheo s bn ln lt thay nhau pht sng theo chu k3 giy.

Cu 3:Xy dng th tc cho php truyn v nhn d liu qua cng USB vi tham scho trc l a ch cng

17311 - Lap Trinh Ghep Noi May Tinh _2

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Transcript of 17311 - Lap Trinh Ghep Noi May Tinh _2