8051 Instruction Set

1
8051??
http//www.win.tue.nl/aeb/comp/8051/set8051.html
http//www.mikroe.com/en/books/8051book/ch3/
http//www.8052.com/tut8051
2
? ?

• ???????
• ???????????
• ????????
• ??????

3
8051?????

• ???? ?? ??? ???, ??
• ??/??(Label)?????????????(ROM)??,????
• ???(Op-Code)?????????,?????????...???
• ???, (Operand)????,????????????0??????3??
• ?????????,????

4
8051???(Instruction)????

• ???? OK ADD A, R3 ? A ? A R3
• OK???/??(Label)?
• ADD?????(op-Code)????(Addition)?
• A?R3?????(Register)?????? (Operand)?
• ?? ? A ? R3???? ??A,??? A ? A R3

5
???????????

• 8051?????(Addressing Mode)?6?
• ?????????????????????
• ??
• ???
• RAM ??
• RAM ??
• RAM ??
• RAM ??
• ROM

6
8051????

• 8051??43????(Op-Code)
• 8051????(Operand)?6????????(Addressing Mode)
• ???????????111???????

7
8051????
ACALL - Absolute Call ADD, ADDC - Add Accumulator (With Carry) AJMP - Absolute Jump ANL - Bitwise AND CJNE - Compare and Jump if Not Equal CLR - Clear Register CPL - Complement Register DA - Decimal Adjust DEC - Decrement Register DIV - Divide Accumulator by B DJNZ - Decrement Register and Jump if Not Zero INC - Increment Register JB - Jump if Bit Set JBC - Jump if Bit Set and Clear Bit JC - Jump if Carry Set JMP - Jump to Address JNB - Jump if Bit Not Set JNC - Jump if Carry Not Set JNZ - Jump if Accumulator Not Zero JZ - Jump if Accumulator Zero LCALL - Long Call LJMP - Long Jump MOV - Move Memory MOVC - Move Code Memory MOVX - Move Extended Memory MUL - Multiply Accumulator by B NOP - No Operation ORL - Bitwise OR POP - Pop Value From Stack PUSH - Push Value Onto Stack RET - Return From Subroutine RETI - Return From Interrupt RL - Rotate Accumulator Left RLC - Rotate Accumulator Left Through Carry RR - Rotate Accumulator Right RRC - Rotate Accumulator Right Through Carry SETB - Set Bit SJMP - Short Jump SUBB - Subtract From Accumulator With Borrow SWAP - Swap Accumulator Nibbles XCH - Exchange Bytes XCHD - Exchange Digits XRL - Bitwise Exclusive OR
8
8051?43???????

• ????(7?)
• MOV?MOVC?MOVX?PUSH?POP?XCH?XCHD
• ????(8?)
• ADD?ADDC?SUBB?MUL?DIV?INC?DEC?DA
• ??/????(12?)
• ANL?ORL?XRL?XORL?CLR?CPL?SWAP?RL?RLC?RR?RRC?SETB?
  (??MOV)
• ????(16?)
• ACALL?LCALL?AJMP?LJMP?SJMP?RET?RETI?JMP?JC?JNC?JB?
  JNB?JZ?JNZ?CJNE?DJNZ

9
8051????

• 43?????6????? ? 111???

• ??????28?
• ??????24?
• ??????25?
• ????????17?
• ??????17?

10
????(Addressing Mode)

• ?????(Immediate Addressing)
• ??????(Register Addressing)
• ?????(Direct Addressing)
• ?????(Indirect Addressing)
• ?????(Indexed Addressing)
• ?????(Bit Addressing)

11
????????????
12
?Keil?????ROM/RAM
13
?????
??????????????????????,????????????????8???????
?? (1) 10??0255 (2) 16??00HFFH????H, (3)
2????00000000B11111111B????B
14
??????
8051???RAM??????????8????,??R0-R7,???????R0-R7????
?????????
15
?????

• ???????????????????????A,????A??????????????
• ???????????(???00H7FH),????????-SFR(???80HFFH)

16
?????

• ?????????Ri (R0?R1) ,?DPTR,?????????????????
• ???????????_at_ ?R0, R0?8??????,??? 256 ??????
  (??00H-FFH). DPTR??? 64K?????(??0000H-FFFFH).

17
?????

• ???????,????????,??????????????
• ???????? DPTR (???????)? PC (?????),????????????
  A
• 8051????????ROM ,???????????

18
?????

• ??SETB??????(bit)?1
• ??CLR??????(bit)?0
• 8051???????????
• ??????????C
• RAM???????(20H2FH,?128 bit),
• P0?P1?P2?P3,TCON,TMOD???????

19
??Keil??????

• ?Keil µVision?????????,??debug??
• ??????,????(Regs), Memory Window???,?????????????

20
?????

• ?????????????????(FILO) ???
• SP????(Stack Pointer)???,?????????????
• ?????????????,
• ??PUSH?POP??,?????????
• ????????,?????????,??????????
• 8051???????(Reset),????SP07H????SP??50H7FH??,???
  ???????????

21
?????????

• ?????????,?PUSH 30H, ??????
• SP-gtSP1,?????1?
• ?????30H??????,???SP?????
• ?????????,?POP 31H,??????
• SP????????, ??31H????
• SP-gtSP-1,?????1?

22
?????????
23
(No Transcript)
24
8051????

• 1.????(direct addressing)
• ADD A, 7FH
• 2.????(indirect addressing)
• MOV A, _at_R0
• 3.?????
• ADD A, R7 ? ADD A,07H
• 4.??????(immediate constants)
• MOV A, 127

25
???(1)

• ???ACC,??A
• ???????DPTR,????????(DPH)????????(DPL)???,???????
  ,????16??????,????????????,???2????8????,?????????
  ?(??????????)

26
???(2)

• ?0?3 (?P0?P1?P2?P3)8051?????????????
• ???????SBUF,??????????,????????????
• MOV SBUF,A (????????)
• MOV A,SBUF (????????)

27
??????(1)

• ??? Rn ?? R0?R1??R7?????
• Add A ,Rn ????????
• Add A,direct ??????????
• Add A,_at_Ri ??????????
• Add A,data ????????
• Addc A,Rn ?? A A Rn C(????)
• Addc A,direct
• Addc A,_at_Ri
• Addc A,data

28
??????(2)

• Subb A,Rn ???-???-c
• Subb A,direct ???-???-c
• Subb A,_at_Ri ???-???-c
• Subb A,data ???-???-c
• INC (DEC) A ???(-)1
• INC (DEC) Rn ???(-)1
• INC (DEC) direct ?????(-)1
• INC (DEC) _at_Rn ?????(-)1

29
??????(3)

• Mul A ,B AB
• Div A,B A/B

30
??????(1)

• ANL A ,Rn ???AND????
• ANL A,direct ?????AND????
• ANL A,_at_Ri ?????AND????
• ANL A,data ???AND????
• ORL A ,Rn ???AND????
• ORL A,direct ?????OR????
• ORL A,_at_Ri ?????OR????
• ORL A,data ???OR????

31
??????(2)

• XRL A ,Rn ???XOR????
• XRL A,direct ?????XOR????
• XRL A,_at_Ri ?????XOR????
• XRL A,data ???XOR????
• CLR A ?????
• RL A ???????
• RLC A ????c??????
• RR A ???????
• RRC A ????c??????
• CPL A ?A?1????A

32
??????(1)

• MOV A,Rn ??????????
• MOV A,direct ????????????
• MOV A,_at_Ri ????????????
• MOV A,data ????????
• MOV Rn,A
• MOV direct,A
• MOV _at_Ri,A

33
??????(2)

• MOVX A,_at_Ri A? ??RAM???(8bit??)
• MOVX A,_at_DPTR A? ??RAM???(16bit??)
• MOVX _at_Ri, A ??RAM?(8bit)?? ? A
• MOVX _at_DPTR, A ??RAM?(16bit)?? ? A
• MOVC A,_at_ADPTR A??????(ROM)???
• PUSH direct ??????????RAM
• POP direct ?RAM??????????
• XCH A,direct ??????????????
• XCH A,Rn ????????????

34
????(Jump)??(1)

• ACALL address - ???????
• RET - ??????
• AJMP address - ??????
• JMP _at_ADPTR - ???????
• NOP - ???(????)

35
??????(2)

• CJNE -CCompare??,JJump??-NENot
  Equal???-???????,??? rel
• CJNE A, direct, rel
• CJNE A, data, rel
• CJNE Rn, data, rel
• CJNE _at_Rn, data, rel
• DJNZ Rn, rel - Rn?1,????0??rel
• DJNZ direct, rel - direct?1,????0??rel

36
??????

• JB bit, rel - ?????bit1 ???rel
• JNB bit, rel - ?????bit0 ???rel
• JC rel - ?????C1 ???rel
• JNC rel - ?????C0 ???rel
• JZ rel - ?????1 ???
• JNZ rel - ?????0 ???
• JBC bit, rel - ?bit1 ???rel, ???bit0
• ???JC?JNC??C??Carry(??) ,?JBC??C??Clear(???0)

37
??????

• SETB bit - ?????bit1
• SETB C - ?????C1
• CLR bit - ?????bit0
• CLR C -?????C0
• CPL bit - ?????bit NOT bit
• CPL C -?????C NOT C
• ORL?ANL?MOV ????????bit?C