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The 8051 Instruction Set
1-43 Atmel 8051 Microcontrollers Hardware Manual
4316E–8051–01/07
1.14.27 LJMPaddr16
1.14.28 MOV <dest-
byte>,<src-byte>
Function: Long Jump
Description: LJMP causes an unconditional branch to the indicated address, by loading the high-order and low-order bytes of
the PC (respectively) with the second and third instruction bytes. The destination may therefore be anywhere in
the full 64K program memory address space. No flags are affected.
Example: The label JMPADR is assigned to the instruction at program memory location 1234H. The instruction,
LJMP JMPADR
at location 0123H will load the program counter with 1234H.
Bytes: 3
Cycles: 2
Encoding: 0 0 0 0 0 0 1 0 addr15-addr8 addr7-addr0
Operation: LJMP
(PC) ← addr
15-0
Function: Move byte variable
Description: The byte variable indicated by the second operand is copied into the location specified by the first operand. The
source byte is not affected. No other register or flag is affected.
This is by far the most flexible operation. Fifteen combinations of source and destination addressing modes are
allowed.
Example: Internal RAM location 30H holds 40H. The value of RAM location 40H is 10H. The data present at input port 1 is
11001010B (0CAH).
MOV R0,#30H ;R0 < = 30H
MOV A,@R0 ;A < = 40H
MOV R1,A ;R1 < = 40H
MOV B,@R1 ;B < = 10H
MOV @R1,P1 ;RAM (40H) < = 0CAH
MOV P2,P1 ;P2 #0CAH
leaves the value 30H in register 0, 40H in both the Accumulator and register 1, 10H in register B, and 0CAH
(11001010B) both in RAM location 40H and output on port 2.
MOV A,R
n
Bytes: 1
Cycles: 1
Encoding: 1 1 1 0 1 r r r
Operation: MOV
(A) ← (R
n
)
- 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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