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The 8051 Instruction Set
Atmel 8051 Microcontrollers Hardware Manual 1-40
4316E–8051–01/07
1.14.21 JMP @A+DPTR
1.14.22 JNB bit,rel
Function: Jump indirect
Description: JMP @A+DPTR adds the eight-bit unsigned contents of the Accumulator with the 16-bit data pointer and loads
the resulting sum to the program counter. This is the address for subsequent instruction fetches. Sixteen-bit
addition is performed (modulo 2
16
): a carry-out from the low-order eight bits propagates through the higher-order
bits. Neither the Accumulator nor the Data Pointer is altered. No flags are affected.
Example: An even number from 0 to 6 is in the Accumulator. The following sequence of instructions branches to one of
four AJMP instructions in a jump table starting at JMP_TBL.
MOV DPTR, # JMP_TBL
JMP @A + DPTR
JMP_TBL: AJMP LABEL0
AJMP LABEL1
AJMP LABEL2
AJMP LABEL3
If the Accumulator equals 04H when starting this sequence, execution jumps to label LABEL2. Because AJMP is
a 2-byte instruction, the jump instructions start at every other address.
Bytes: 1
Cycles: 2
Encoding: 0 1 1 1 0 0 1 1
Operation: JMP
(PC) ← (A) + (DPTR)
Function: Jump if Bit Not set
Description: If the indicated bit is a 0, JNB branches to the indicated address; otherwise, it proceeds with the next instruction.
The branch destination is computed by adding the signed relative-displacement in the third instruction byte to the
PC, after incrementing the PC to the first byte of the next instruction. The bit tested is not modified. No flags are
affected.
Example: The data present at input port 1 is 11001010B. The Accumulator holds 56H (01010110B). The following
instruction sequence,
JNB P1.3,LABEL1
JNB ACC.3,LABEL2
causes program execution to continue at the instruction at label LABEL2.
Bytes: 3
Cycles: 2
Encoding: 0 0 1 1 0 0 0 0 bit address rel. address
Operation: JNB
(PC) ← (PC) + 3
IF (bit) = 0
THEN (PC) ← (PC) + rel
- 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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