mP2 - 8085

: : .

8085

8085

( )

8085

, I/O

: : .

8085

P ROM RAM I/O

SYSTEM BUS

IO/MRD WRIO/MRD WRIO/M RD

IN OUT

: : .

A0-A15 ()

D0-D7

RD

WR

IO/M /

MEMR .

MEMW .

I/OR

I/OW

Reset ()

: : .

74LS373

A0-7

D0-7

A0-15

A8-15

LEOEALE

AD0-7

8085

Data Bus 8 bits Address Bus 8085

: : .

8085 OPCODE FETCH

MEMORY READ

MEMORY WRITE

I/O READ

I/O WRITE

INTERRUPT ACKNOWLEDGE

BUS IDLE

TR

T1

T2

T3 T4 T5 T6O.F.

O.F.

RESET

8085

: : .

STA

STA 13

STORE ACCUMULATOR DIRECT: STA

OPCODE Byte 1

LO ADDR Byte 2

HI ADDR Byte 3

M2 M3M1

1

OPCODE FETCH M-READM-READ M-WRITE

2 3 4

: : .

8085

1

2

RESET OUT

SOD

SID

TRAP

RST 7.5

RST 6.5

RST 5.5

INTR

INTA

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

Vss

Vcc

HOLD

HLDA

CLK (OUT)

RESET IN

READY

IO/M

S1

RD

WR

ALE

S0

A15

A14

A13

A12

A11A10

A9

A8

2

3

1

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20 21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

8085A

Data-Address

Interrupts

Address

Serial Input/Output

4.1mm

5.5 mm

6.200transistors

: : .

8085

Crystal

X1 X2

Reset In

ALE

A8-A15

AD0-AD7

RD, WR, IO/M8085A

Address Latch

ROMRAM

In/Out Ports

InputOutput

Address Bus (A0-A15)

Data Bus

Control Bus

3

8

16

38 38

8

8

16

: : .

: 1050: STA 4020H

CLK

S1, S0

A8-A15

AD0-AD7

ALE

RD

WR

T1 T2 T3 T4 T1 T2 T3 T1 T2 T3 T1 T2 T3

IO/M , (0, 1, 1) (0, 1, 0) (0, 1, 0) (0, 0, 1)

M1 (Opcode Fetch) M2 (Read) M3 (Read) M4 (Write)

10H 10H 10H 40H

50H 32H 51H 20H 52H 40H 20H 30H

STA opcode: 32H (ACC) = 30 H

: : .

2000: STA 2010H

10 A100210013200

20 20 20 20

T1 T2 T3 T4 T1 T2 T3 T1 T2 T3 T1 T2 T3

OPCODE FETCH MEM READ MEM READ MEM WRITE

IO/#M = 0 (1,1) IO/#M = 0 (0,1) IO/#M = 0 (0,1) IO/#M = 0 (1,0)

CLK

IO/#M,

(S0, S1)

A8 - A15

AD0 - AD7

ALE

RD

WR

READY

STA opcode: 32 ACC A

: : .

8085 (A)

(FLAGS)

S Z AC P CY

. .

: : .

8085

( )

(Flip-Flops)

A

DMA RESET

CLK OUT

READY

RD WR

ALE

S0S1

IO/M

HOLD

HLDA

RESET IN

RESET OUT

X2

X1

INTR INTA' RST5.5

RST6.5

RST7.5

TRAP

8-bit

/

SID SOD

C

8 bit

D E

H L

(PC) 16 bit

(SP)

16 bit

/

8-15 D0-D7

/

Latch /

8 bit

16 bit

8 bit 8 bit

8 bit

8 bit

16 bit 8 bit

S Z AC P CY

()

x x x

: : .

8085 ()

bit-mask

bit-mask

111 A

000 B

001 C

010 D

011 E

100 H

101 L

8 bits

00 B-C

01 D-E

10 H-L

11 SP

: : .

0 d1 0 s s0 sd10 s sd s

K1: 1opcode

K2: 2

8085

MOV (Move)

MOV 2, 1 ( 1 . 2)

1

4

K2 K1

sss

ddd

111 A

000 B

001 C

010 D

011 E

100 H

101 L

: : .

0 d1 0 s s0 sd10 1 0d 1

M: (HL)opcode

K:

8085

MOV K, M

MOV , ( )

(K) M: ((H)(L))

sss

ddd

111 A

000 B

001 C

010 D

011 E

100 H

101 L

110 M

2

7

: : .

0 11 0 s s0 s110 s s0 s

K: opcode

: (HL)

8085

MOV M, K

MOV , ( )

sss

ddd

111 A

000 B

001 C

010 D

011 E

100 H

101 L

110 M (K)M: ((H)(L))

2

7

: : .

8085

MVI (Move Immediate)

MVI , Data

2

7

K(A,B,C,D,E,H,L)

Data

0 d1 0 s s0 sd00 1 0d 1

opcode

K:

data

: : .

8085

MOV M, K MOV K, M

Addr Data

opcode

dAD

H AD

LH L

r MOV r, M

MOV M, r

:

MVI H, 20H

MVI L, 00H

MVI A, 10H

MOV M, A

[2000H] = 10H

: : .

8085


MVI , Data

3

10

(HL) Data

0 11 0 s s0 s100 1 00 1

opcode

data

: : .

8085


Addr Data

opcode

dataAD

H AD

LH L

dataMVI M, data

: MVI H, 20H

MVI L, 00H

MVI M, 10H

[2000H] = 10H

: : .

8085

16 bit

LXI (Load Register Pair Immediate)

LXI RP, Data

3

10

(BC, DE, HL, SP)

Data

0 P1 0 s s0 sR00 0 10 0

opcode

Data Low

Data High

00 B-C

01 D-E

10 H-L

11 SP

: : .

8085

16 bit

LXI (Load Register Pair Immediate)

LXI rp, data16

: LXI H, 2000H

MVI M, 10H

[2000H] = 10H

dL

Addr Data

opcode

H L

dH

: : .

STA addr

8085

LDA (opcode 3), STA (opcode 32),

(Load / Store Accumulator)

LDA addr

A A

4

13

1 10 0 1 01 0address lowaddress high


: : .

8085

/

LDA (2 bytes)

A

4

13

STA (2 bytes)

A

4

13

1 10 0 1 01 0 opcode

1 10 0 1 00 0 opcode

: : .

8085

LDA, STA (Load / Store Accumulator)

LDA addr

STA addr

:

MVI A, 10H

STA 2000H

[2000H] = 10H

d

Addr Data

opcode

ADH AD

L

A

ADL

ADH

LDA

STA

: : .

8085

/ H-L

LHLD (2 bytes) 5

16

L

H + 1

SHLD (2 bytes) 5

16

L

H + 1

opcode

opcode 1 00 0 1 00 0

address lowaddress high


: : .

8085

LHLD, SHLD (Load / Store H-L Double)

LHLD addr

SHLD addr

: MVI A, 00H STA 1000H MVI A, 20H STA 1001H LXI H, 2000H SHLD 1000H

Addr Data

opcode

ADH AD

L

ADL

ADH

ADH AD

L+1 dH

dL

H L

SHLD

LHLD

: : .

8085

/

LDA .

A ( .)

2

7

STA .

A ( .)

2

7

ss rp

00 B-C

01 D-E

s s0 0 1 01 0

s s0 0 1 00 0

opcode

opcode

: : .

8085

&

LDAX, STAX

LDAX rp

STAX rp

:

LXI B, 2000H

MVI A, 10H

STAX B d

Addr Data

opcode

ADH AD

L

ALDAX

STAX

B C

D E

: : .

8085

XCHG 1

4

HL DE H

L

D

E

( )

1 01 1 1 11 0

opcode

: : .

0 01 0 s s1 s

opcode

0 01 0 s s0 s

0 01 0 s s0 s

opcode

8085

ADD 1

4

A A K+

ADC

A A K+ CY+

sss r

111 A

000 B

001 C

010 D

011 E

100 H

101 L 1

4

: : .

0 01 0 1 01 1

Memoryopcode

8085

.

A A + M:((H)(L))

A A + CY+M:((H)(L))

ADD M

2

7 ADC

2

7

M

0 01 0 1 00 1

Memoryopcode

: : .

8085

ADI Data 2

7

A A Data+

ACI Data 2

7

A A Data+ CY+0 01 1 1 01 1data

opcode

0 01 1 1 00 1data

opcode

: : .

8085

SUB

A A K-

SUB M

SBB

A A K- CY-

SBB M

(A) (A) - M:((H)(L))

(A) (A) - CY-M:((H)(L))

: : .

8085

SUI Data

(A) (A) Data-

SBI Data

(A) (A) Data- CY-

: : .

8085

- 1

INR

INR M DCR M

(K) + 1(K)

+ 1((H)(L)) ((H)(L))

DCR

(K) - 1(K)

- 1((H)(L)) ((H)(L))

: : .

8085

INX .

HL HL + 1.. INX H:

DCX .

BC BC - 1.. DCX B:

DAD .

HL HL + .

ss rp

00 B-C

01 D-E

10 H-L

11 SP

: : .

8085

AND

A A K

M

A A HL

ANI Data

A A Data

: : .

8085

R

ORA ORA M

ORI Data

A A KV A A HLV

A A DataV

: : .

8085

XOR

XRA

A A K

XRA M

XRI Data

A A Data

A A HL

: : .

8085

( , )

CMP CMP M

A K-

CY=1

=1 =

CPI Data

: : .

8085

JMP Address (2 bytes)

PC Address

CALL Address (2 bytes)

SP-1 PCH

SP-2 PCL

SP SP - 2

PC Address

RET



: : .

8085

:

JNZ JNC JPO JP

JZ JC JPE JM

Z=0 CY=0 P=0 S=0

Address

Z=1 CY=1 P=1 S=1

. (Z=0)

C (CY=0)

PO (P=0)

P (S=0)

M (Z=1)

C K (CY=1)

PE (P=1)

M (S=1)

( )

Address

: : .

8085

RLC

RRC

7

7

6

5

4

3

2

1

0

6

5

4

3

2

1

0

7

CY

7

6

5

4

3

2

1

0

0

7

6

5

4

3

2

1

0

CY

: : .

8085

RAL

RAR 7 6 5 4 3 2 1 0CY 7 6 5 4 3 2 1

0

CY

7 7 6 5 4 3 2 1 0

6 5 4 3 2 1 0 CY

CY

: : .

8085

1

CMA

CMC

STC

A A

CY 1

CY CY

mP2 - 8085

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