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The 8051 Instruction Set
1-15 Atmel 8051 Microcontrollers Hardware Manual
4316E–8051–01/07
1.11 Instruction Set
Summary
Note: 1. All mnemonics copyrighted © Intel Corp., 1980.
Mnemonic Description Byte Oscillator
Period
ARITHMETIC OPERATIONS
ADD A,R
n
Add register to Accumulator 1 12
ADD A,direct Add direct byte to Accumulator 2 12
ADD A,@R
i
Add indirect RAM to Accumulator 1 12
ADD A,#data Add immediate data to Accumulator 2 12
ADDC A,R
n
Add register to Accumulator with
Carry
1 12
ADDC A,direct Add direct byte to Accumulator with
Carry
2 12
ADDC A,@R
i
Add indirect RAM to Accumulator with
Carry
1 12
ADDC A,#data Add immediate data to Acc with Carry 2 12
SUBB A,R
n
Subtract Register from Acc with
borrow
1 12
SUBB A,direct Subtract direct byte from Acc with
borrow
2 12
SUBB A,@R
i
Subtract indirect RAM from ACC with
borrow
1 12
SUBB A,#data Subtract immediate data from Acc
with borrow
2 12
INC A Increment Accumulator 1 12
INC R
n
Increment register 1 12
INC direct Increment direct byte 2 12
INC @R
i
Increment direct RAM 1 12
DEC A Decrement Accumulator 1 12
DEC R
n
Decrement Register 1 12
DEC direct Decrement direct byte 2 12
DEC @R
i
Decrement indirect RAM 1 12
INC DPTR Increment Data Pointer 1 24
MUL AB Multiply A & B 1 48
DIV AB Divide A by B 1 48
DA A Decimal Adjust Accumulator 1 12
Mnemonic Description Byte Oscillator
Period
LOGICAL OPERATIONS
ANL A,R
n
AND Register to Accumulator 1 12
ANL A,direct AND direct byte to Accumulator 2 12
ANL A,@R
i
AND indirect RAM to Accumulator 1 12
- Atmel 8051 Microcontrollers 1
- Hardware Manual 1
- Table of Contents 2
- Section 1 3
- 1.2 Addressing 4
- 1.3 Arithmetic 6
- 1.4 Logical 7
- 1.5 Data Transfers 8
- The 8051 Instruction Set 10
- 1.6 External RAM 11
- 1.7 Lookup Tables 11
- 1.8 Boolean 12
- Instructions 12
- C= bit1 XRL bit2 13
- MOV C, bit1 13
- JNB bit2, OVER 13
- OVER: (continue) 13
- 1.9 Jump 14
- 1.10 Read-Modify 16
- Write Instruction 16
- Features 16
- 1.11 Instruction Set 17
- 1.12 Instructions That 21
- Affect Flag 21
- Settings 21
- 1.13 Instruction Table 22
- 1.14 Instruction Definitions 25
- 1.14.2 ADD A,<src-byte> 26
- ADD A,direct 26
- ADD A,@R 26
- ADD A,#data 26
- ADDC A,R 27
- ADDC A,direct 27
- ADDC A,@R 27
- ADDC A,#data 27
- 1.14.4 AJMPaddr11 28
- ANL A,R 29
- ANL A,direct 29
- ANL A,@R 29
- 1.14.6 ANLC,<src-bit> 30
- ANL A,#data 30
- ANL direct,A 30
- ANL direct,#data 30
- ANL C,bit 30
- 1.14.7 CJNE <dest 31
- ANL C,/bit 31
- CJNE A,direct,rel 31
- CJNE A,#data,rel 32
- ,#data,rel 32
- CJNE @R 32
- ,data,rel 32
- 1.14.8 CLR A 33
- 1.14.9 CLR bit 33
- CLR bit 33
- 1.14.10 CPL A 34
- 1.14.11 CPL bit 34
- CPL bit 34
- 1.14.12 DA A 35
- 1.14.13 DECbyte 36
- DEC direct 36
- 1.14.14 DIVAB 37
- DJNZ direct,rel 38
- 1.14.16 INC<byte> 39
- INC direct 39
- 1.14.17 INC DPTR 40
- 1.14.18 JB blt,rel 40
- 1.14.19 JBC bit,rel 41
- 1.14.20 JC rel 41
- 1.14.21 JMP @A+DPTR 42
- 1.14.22 JNB bit,rel 42
- 1.14.23 JNC rel 43
- 1.14.24 JNZ rel 43
- 1.14.25 JZ rel 44
- 1.14.26 LCALLaddr16 44
- 1.14.27 LJMPaddr16 45
- 1.14.28 MOV <dest 45
- MOV A,R 45
- 4316E–8051–01/07 46
- 1.14.30 MOV DPTR,#data16 49
- 1.14.31 MOVC A,@A+ 49
- <base-reg> 49
- 1.14.32 MOVX <dest 50
- MOVC A,@A+DPTR 50
- MOVC A,@A+PC 50
- MOVX A,@R 50
- 1.14.33 MUL AB 51
- MOVX A,@DPTR 51
- MOVX @DPTR,A 51
- 1.14.34 NOP 52
- <src-byte> 53
- ORL A,direct 53
- ORL A,@R 53
- 1.14.35 ORL<dest-byte> 53
- 1.14.37 POP direct 56
- 1.14.38 PUSH direct 56
- 1.14.39 RET 57
- 1.14.40 RETI 57
- 1.14.41 RL A 58
- 1.14.42 RLC A 58
- 1.14.43 RR A 59
- 1.14.44 RRC A 59
- 1.14.45 SETB<bit> 60
- 1.14.46 SJMP rel 60
- SETB bit 60
- SUBB A,R 61
- SUBB A,direct 61
- SUBB A,@R 61
- 1.14.48 SWAP A 62
- 1.14.49 XCH A,<byte> 62
- SUBB A,#data 62
- XCH A,R 62
- XCH A,direct 62
- 1.14.50 XCHD A,@R 63
- XCH A,@R 63
- 1.14.51 XRL <dest 64
- XRL A,R 64
- XRL A,direct 64
- XRL A,@R 64
- XRL A,@#data 65
- XRL direct,A 65
- Section 2 66
- Note: (*)For Timer 2 only 67
- 2.2 Special Function 68
- Registers 68
- 2.3 Oscillator and 70
- Clock Circuit 70
- 2.4 CPU Timing 71
- 2.5 Port Structures 73
- 2.6 Accessing 77
- External Memory 77
- 2.7 PSEN 78
- Reset Value = XXXX XX00b 80
- Table 2-2. AUXR Register 80
- 2.9 Timer/Counters 81
- 2.10 Timer 0 82
- 2.11 Timer 1 84
- 2.12 Timer 2 89
- Timer 2 Control Register 92
- 2.13 Serial Interface 94
- Baud Rate Selection for 97
- UART for Mode 1 and 3 97
- Common Features Description 100
- 2.14 Framing Error 104
- Detection 104
- 2.15 Automatic 105
- Address 105
- Recognition 105
- UART Registers 108
- Reset Value = 0000 0000b 110
- Bit addressable 110
- Table 2-24. T2CON Register 110
- 2.16 Interrupts 112
- Regional Headquarters 116
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