8085 Instruction Set & T-Clock Cycles
8085 Instruction Set & T-Clock Cycles
|
Symbol
|
Meaning
|
|
A
|
Accumulator
|
|
B,C,D, E,H,L
|
8085 8-Bit register (internal registers)
|
|
F
|
Represents the flag register
|
|
M
|
The 16-bit memory address currently held by the
register pair H and L
|
|
byte
|
An 8-bit data quantity
|
|
port
|
An 8-bit I/O port address
|
|
r, rl, r2
|
8085 8-Bit register (One of the registers A, B, C,
D, E, H, L)
|
|
rp
|
One of the following register pairs
B represents the register pair Band C
D represents the register pair D and E
H represents the register pair Hand L
PSW represents the register pair A and F
SP represents the 16-bit stack pointer
|
|
PC
|
The 16-bit program counter
|
|
CY
|
Carry flag
|
|
P
|
Parity flag
|
|
AC
|
Auxiliary carry flag
|
|
Z
|
Zero flag
|
|
S
|
Sign flag
|
MOVE, LOAD AND STORE INSTRUCTION SET
|
Mnemonic
|
T- Cycles
|
Control Signals
|
|
MOV rl, r2
|
4
|
RD,
|
|
MOV M, r
|
7
|
RD,WR
|
|
MOV r, M
|
7
|
RD,RD
|
|
MVI r, 8-bit
Data
|
7
|
RD,RD
|
|
MVI M, 8-bit
Data
|
10
|
RD,RD,WR
|
|
LXI B, 16-bit
Data
|
10
|
RD,RD,RD
|
|
LXI D, 16-bit
Data
|
10
|
RD,RD,RD
|
|
LXI H, 16-bit
Data
|
10
|
RD,RD,RD
|
|
LXI SP, 16-bit
Data
|
10
|
RD,RD,RD
|
|
STAX B
|
7
|
RD,
WR
|
|
STAX D
|
7
|
RD,
WR
|
|
LDAX B
|
7
|
RD,
RD
|
|
LDAX D
|
7
|
RD,
RD
|
|
STA 16-bit
Data
|
13
|
RD,
RD, RD, WR
|
|
LDA 16-bit
Data
|
13
|
RD,
RD, RD,RD
|
|
SHLD 16-bit
Data
|
16
|
RD,
RD, RD, RD,WR
|
|
LHLD 16-bit
Data
|
16
|
RD,
RD, RD, RD, RD
|
|
XCHG
|
4
|
RD
|
ADD, SUBTRACT, INCREMENT AND
DECREMENT INSTRUCTION SET
|
Mnemonic
|
T- Cycles
|
Control Signals
|
|
ADD r
|
4
|
RD
|
|
ADC r
|
4
|
RD
|
|
ADD M
|
7
|
RD,RD
|
|
ADC M
|
7
|
RD,
RD
|
|
ADI 8-bit Data
|
7
|
RD,
RD
|
|
ACI 8-bit Data
|
7
|
RD,
RD
|
|
DAD B
|
10
|
RD,
RD, RD
|
|
DAD D
|
10
|
RD,
RD,RD
|
|
DAD H
|
10
|
RD,
RD, RD
|
|
DAD SP
|
10
|
RD,
RD, RD
|
|
SUB r
|
4
|
RD
|
|
SBB r
|
4
|
RD
|
|
SUB M
|
7
|
RD,RD
|
|
SBB M
|
7
|
RD,
RD
|
|
SUI 8-bit Data
|
7
|
RD,
RD
|
|
SBI 8-bit Data
|
7
|
RD,
RD
|
|
INR r
|
4
|
RD
|
|
DCR r
|
4
|
RD
|
|
INR M
|
10
|
RD,RD,RD,WR
|
|
DCRM
|
10
|
RD,RD,RD,WR
|
|
INX B
|
6
|
RD
|
|
INX D
|
6
|
RD
|
|
INX H
|
6
|
RD
|
|
INX SP
|
6
|
RD
|
|
DCX B
|
6
|
RD
|
|
DCX D
|
6
|
RD
|
|
DCX H
|
6
|
RD
|
|
DCX SP
|
6
|
RD
|
JUMP INSTRUCTION SET
|
Mnemonic
|
T- Cycles
|
Control Signals
|
|
JMP 16-bit
Data
|
10
|
RD,RD,RD
|
|
JC 16-bit Data
|
7/10
|
RD,RD,RD
|
|
JNC16-bit Data
|
7/10
|
RD,RD,RD
|
|
JZ 16-bit Data
|
7/10
|
RD,RD,RD
|
|
JNZ 16-bit
Data
|
7/10
|
RD,RD,RD
|
|
JP 16-bit Data
|
7/10
|
RD,RD,RD
|
|
JM 16-bit Data
|
7/10
|
RD,RD,RD
|
|
JPE 16-bit
Data
|
7/10
|
RD,RD,RD
|
|
JPO 16-bit
Data
|
7/10
|
RD,RD,RD
|
|
PCHL
|
6
|
RD
|
STACK, CALL OPERATIONS & RETURN INSTRUCTION SET
|
Mnemonic
|
T- Cycles
|
Control Signals
|
|
PUSH B
|
12
|
RD,
RD, WR
|
|
PUSH D
|
12
|
RD,RD,WR
|
|
PUSH H
|
12
|
RD,
RD, WR
|
|
PUSH PSW
|
12
|
RD,RD,WR
|
|
POP B
|
10
|
RD,RD,RD
|
|
POP D
|
10
|
RD,RD,RD
|
|
POP H
|
10
|
RD,RD,RD
|
|
POP PSW
|
10
|
RD,RD,RD
|
|
XTHL
|
16
|
RD,RD,RD,WR,WR
|
|
SPHL
|
6
|
RD
|
|
CALL 16-bit
Data
|
18
|
RD,RD,RD,RD,RD,RD
|
|
CC 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CNC 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CZ 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CNZ 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CP 16-bit Data
|
9/1
8
|
RD,RD,RD,RD,RD,RD
|
|
CM 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CPE 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
CPO 16-bit Data
|
9/18
|
RD,RD,RD,RD,RD,RD
|
|
RET 16-bit
Data
|
10
|
RD,RD,RD
|
|
RC 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RNC 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RZ 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RNZ 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RP 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RM 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RPE 16-bit
Data
|
6/12
|
RD,RD,RD
|
|
RPO 16-bit
Data
|
6/12
|
RD,RD,RD
|
LOGICAL,
INTERRUPTMASK, ROTATE, SPECIALS, CONTROL, RESTART
&
INPUT/OUTPUT INSTRUCTION SET
|
Mnemonic
|
T- Cycles
|
Control Signals
|
|
ANA r
|
4
|
RD
|
|
XRA r
|
4
|
RD
|
|
ORA r
|
4
|
RD
|
|
CMP r
|
4
|
RD
|
|
ANAM
|
7
|
RD,RD
|
|
XRA M
|
7
|
RD,RD
|
|
ORAM
|
7
|
RD,RD
|
|
CMP M
|
7
|
RD,RD
|
|
ANI 8-bit
Data
|
7
|
RD,RD
|
|
XRI 8-bit
Data
|
7
|
RD,RD
|
|
ORI 8-bit
Data
|
7
|
RD,RD
|
|
CPI 8-bit
Data
|
7
|
RD,RD
|
|
DAA
|
4
|
RD,RD
|
|
RIM
|
4
|
RD,RD
|
|
SIM
|
4
|
RD
|
|
DI
|
4
|
RD
|
|
EI
|
4
|
RD
|
|
RLC
|
4
|
RD
|
|
RRC
|
4
|
RD
|
|
RAL
|
4
|
RD
|
|
RAR
|
4
|
RD
|
|
CMA
|
4
|
RD
|
|
STC
|
4
|
RD
|
|
CMC
|
4
|
RD
|
|
DAA
|
4
|
RD
|
|
NOP
|
4
|
RD
|
|
HLT
|
5
|
XX
|
|
IN 8-bit
Data
|
10
|
RD, RD
|
|
OUT 8-bit
Data
|
10
|
RD, WR
|
|
RST
|
12
|
XX
|
REFERENCES
1.
R. S. Gaonkar, Microprocessor
Architecture, Programming, and Applications with the 8085, Fifth Edition,
Penram International Publishing (India) Private Limited.
2.
S Ghoshal, Microprocessor Based System
Design, Macmillan India Limited, 1996
3.
M. Mano, Digital Logic and Computer
Design, Prentice – Hall India
4.
B. Ram - Fundamentals of Microprocessor
and Microcontrollers
5.
“Microprocessors:
Principles and Applications” by A Pal
6.
“Microprocessors and
Microcontrollers : Architecture, Programming and Interfacing Using 8085, 8086
and 8051” by Soumitra Kumar Mandal
7.
“Introduction to
Microprocessors and Microcontrollers” by Crisp John Crisp
8.
“Microprocessors And
Microcontrollers” by A Nagoor Kani
9.
“Microprocessors And
Microcontrollers : Architecture, Programming and System Design 8085, 8086,
8051, 8096” by KRISHNA KANT
10. “8
- Bit Microprocessor” by Vibhute
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