8751 INSTRUCTIONS
The
8051
Instruction
Set
Revised 11/12/08
Jerry H. Tucker
[pic]
MEMORY
CODE MEMORY Internal ROM selected by [pic] = 1
CM = CM(0..0FFFFH) = CM(0..0FFFFH;7..0)[1]
ON CHIP DATA MEMORY
DM = DM(0..FFH) = DM(0..FFH;7..0)
Note: Direct addressing of DM(80..FFH) accesses special function registers (SFR). Indirect addressing (i.e. @R0, @R1) must be used to accesses DM(80..FFH).
ON CHIP BIT ADDRESSIABLE MEMORY
BADM = DM(20..2F) = BADM(0..0FF) = BADM(0..0FF;0) ;Bit addressable data memory.
EXTERNAL RAM MEMORY
XM = XM(0..0FFFFH) = XM(0..0FFFFH;7..0)
INTERNAL REGISTERS AND PORTS
PC = PC(15..0)
SP = SP(7..0)
DPTR = DPTR(15..0)
PSW = CY|AC|F0|RS1|RS0|OV|-|P[2]
TCON = TF1|TR1|TF0|TR0|IE1|IT1|IE0|IT0
BADM(87H..80H) = P0 = P0(7..0) = BADM(87H..80H)
BADM(8FH..88H) = TCON =BADM(8FH..88H)
BADM(97H..90H) = P1 = P1(7..0) =BADM(97H..90H)
BADM(9FH..98H) = SCON =BADM(9FH..98H)
BADM(A7H..A0H) = P2 = P2(7..0) =BADM(A7H..A0H)
BADM(AFH..A8H) = IE =BADM(AFH..A8H)
BADM(B7H..B0H) = P3 = P3(7..0) =BADM(B7H..B0H)
BADM(BFH..B8H) = IP =BADM(BFH..B8H)
BADM(C7H..C0H) = BADM(C7H..C0H)
BADM(CFH..C8H) = BADM(CFH..C8H)
BADM(D7H..D0H) = PSW =BADM(D7H..D0H)
BADM(DFH..D8H) = BADM(DFH..D8H)
BADM(E7H..E0H) = ACC = A = A(7..0) = BADM(E7H..E0H)
BADM(EFH..E8H) = BADM(EFH..E8H)
BADM(F7H..F0H) = B =BADM(F7H..F0H)
BADM(FFH..F8H) = BADM(FFH..F8H)
RESET
PC ( 0, A ( 0, B ( 0, PSW ( 0, SP ( 7H, SPTR ( 0, P0-P3 ( 0FFH,
IP ( XXX00000B, IE ( 0XX00000B, TMOD ( 0, TCON ( 0, TH0 ( 0, TL0 ( 0, TH1 ( 0, TL1 ( 0, SCON ( 0, PCON ( 0XXXXXXXB, DPTR ( 0000H
INTERNAL DATA MEMORY
|00H-07H |RB0 |Register Bank 0 |
|08H-0FH |RB1 |Register Bank 1 |
|10H-17H |RB2 |Register Bank 2 |
|18H-1FH |RB3 |Register Bank 3 |
|20H-27H |BAM(00H)-BAM(3FH) |Bit addressable memory |
|28H-2FH |BAM(40H)-BAM(7FH) |Bit addressable memory |
|30H-37H | |Available to user. |
|38H-3FH | |Available to user. |
|40H-47H | |Available to user. |
|48H-4FH | |Available to user. |
|50H-57H | |Available to user. |
|58H-5FH | |Available to user. |
|60H-67H | |Available to user. |
|68H-6FH | |Available to user. |
|70H-77H | |Available to user. |
|78H-7FH | |Available to user. |
|80H |P0 |SFR |
|81H |SP | |
|82H |DPL |DPTR |
|83H |DPH | |
|84H | | |
|85H | | |
|86H | | |
|87H |PCON | |
|88H | | |
|89H |TMOD |Timer/Counter Mode Control |
|8AH |TL0 | |
|8BH |TL1 | |
|8CH |TH0 | |
|8DH |TH1 | |
|98H |SCON |Serial Port control |
|99H |SBUF | |
| | | |
Special Function Memory (Bit addressable)
|BAM |P0.7 |P0.6 |P0.5 |P0.4 |P0.3 |P0.2 |P0.1 |P0.0 | |
|80H |87 |86 |85 |84 |83 |82 |81 |80 |P0 |
| |TF1 |TR1 |TF0 |TR0 |IE1 |IT1 |IE0 |IT0 | |
|88H |8F |8E |8D |8C |8B |8A |89 |88 |TCON |
| |P1.7 |P1.6 |P1.5 |P1.4 |P1.3 |P1.2 |P1.1 |P1.0 | |
| 90H |97 |96 |95 |94 |93 |92 |91 |90 |P1 |
| |SM0 |SM1 |SM2 |REN |TB8 |RB8 |TI |RI | |
|98H |9F |9E |9D |9C |9B |9A |99 |98 |SCON |
| |P2.7 |P2.6 |P2.5 |P2.4 |P2.3 |P2.2 |P2.1 |P2.0 | |
|A0H |A7 |A6 |A5 |A4 |A3 |A2 |A1 |A0 |P2 |
| |EA | | |ES |ET1 |EX1 |ET0 |EX0 | |
|A8H |AF |AE |AD |AC |AB |AA |A9 |A8 |IE |
| |[pic] |[pic] |T1 |T0 |[pic] |[pic] |TXD |RXD | |
| |P3.7 |P3.6 |P3.5 |P3.4 |P3.3 |P3.2 |P3.1 |P3.0 | |
|B0H |B7 |B6 |B5 |B4 |B3 |B2 |B1 |B0 |P3 |
| | | | |PS |PT1 |PX1 |PT0 |PX0 | |
|B8H |BF |BE |BD |BC |BB |BA |B9 |B8 |IP |
| | | | | | | | | | |
|C0H |C7 |C6 |C5 |C4 |C3 |C2 |C1 |C0 |- |
| | | | | | | | | | |
|C8H |CF |CE |CD |CC |CB |CA |C9 |C8 |- |
| |CY |AC |FO |RS1 |RS0 |OV | |P | |
|D0H |D7 |D6 |D5 |D4 |D3 |D2 |D1 |D0 |PSW |
| | | | | | | | | | |
|D8H |DF |DE |DD |DC |DB |DA |D9 |D8 |- |
| | | | | | | | | | |
|E0H |E7 |E6 |E5 |E4 |E3 |E2 |E1 |E0 |ACC |
| | | | | | | | | | |
|E8H |EF |EE |ED |EC |EB |EA |E9 |E8 |- |
| | | | | | | | | | |
|F0H |F7 |F6 |F5 |F4 |F3 |F2 |F1 |F0 |B |
| | | | | | | | | | |
|F8H |FF |FE |FD |FC |FB |FA |F9 |F8 |- |
NOTATION DEFINITIONS
n ( {0,1}, i ({0,...,7}, bit ({0,1}, byte ({0,...,255}, dbyte ({0,...,255}
short ({0,...,03FFH}, addr ({0,...,0FFFFH}
Rn ({R0, R1}, Ri ({R0, R1, ..., R7}
Ri = DM(i+8*RBANK)
RBANK = RS1*2+RS0
ARITHMETIC INSTRUCTIONS
| | | | |
|ADD |A,#byte |;A ( A + byte | |
|ADD |A,@Rn |;A ( A + DM(Rn) | |
|ADD |A,Ri |;A ( A + Ri | |
|ADD |A,byte |;A ( A + DM(byte) | |
| | | | |
|ADDC |A,#byte |;A ( A + byte + CY | |
|ADDC |A,@Rn |;A ( A + DM(Rn) + CY | |
|ADDC |A,Ri |;A ( A + Ri + CY | |
|ADDC |A,byte |;A ( A + DM(byte) + CY | |
| | | | |
|SUBB |A,#byte |;A ( A - byte - CY | |
|SUBB |A,@Rn |;A ( A - DM(Rn) - CY | |
|SUBB |A,Ri |;A ( A - Ri - CY | |
|SUBB |A,byte |;A ( A - DM(byte) - CY | |
| | | | |
|INC |A |;A ( A + 1 | |
|INC |@Rn |;DM(Rn) ( DM(Rn) + 1 | |
|INC |Ri |;Ri ( Ri + 1 | |
|INC |byte |;DM(byte) ( DM(byte) + 1 | |
|INC |DPTR |;DPTR ( DPTR + 1 | |
| | | | |
|DEC |A |;A ( A - 1 | |
|DEC |@Rn |;DM(Rn) ( DM(Rn) - 1 | |
|DEC |Ri |;Ri ( Ri - 1 | |
|DEC |byte |;DM(byte) ( DM(byte) - 1 | |
| | | | |
|MUL |AB |;B|A ( A*B | |
|DIV |AB |;A ( A/B, B ( A MOD B | |
| | | | |
|DA |A |;IF AC=1 OR A(3..0) > 9 THEN A ( A+6 | |
| | |;IF CY=1 OR A(7..4) > 9 THEN A(A+60H | |
Rn ({R0, R1}, Ri ({R0, R1, ..., R7}
LOGICAL INSTRUCTIONS
| | | |
|ANL |A,#byte |;A ( A ( byte |
|ANL |A,@Rn |;A ( A ( DM(Rn) |
|ANL |A,Ri |;A ( A ( Ri |
|ANL |A,byte |;A ( A ( DM(byte) |
|ANL |dbyte,#byte |;DM(dbyte) ( DM(dbyte) ( byte |
|ANL |byte,A |;DM(byte) ( A ( DM(byte) |
| | | |
|ORL |A,#byte |;A ( A ( byte |
|ORL |A,@Rn |;A ( A ( DM(Rn) |
|ORL |A,Ri |;A ( A ( Ri |
|ORL |A,byte |;A ( A ( DM(byte) |
|ORL |dbyte,#byte |;DM(dbyte) ( DM(dbyte) ( byte |
|ORL |byte,A |;DM(byte) ( A ( DM(byte) |
| | | |
|XRL |A,#byte |;A ( A ( byte |
|XRL |A,@Rn |;A ( A ( DM(Rn) |
|XRL |A,Ri |;A ( A ( Ri |
|XRL |A,byte |;A ( A ( DM(byte) |
|XRL |dbyte,#byte |;DM(dbyte) ( DM(dbyte) ( byte |
|XRL |byte,A |;DM(byte) ( A ( DM(byte) |
| | | |
|CLR |A |;A ( 0 |
| | | |
|CPL |A |;A ( [pic] |
| | | |
|RL |A |;A ( A(6..0)|A(7) |
|RLC |A |;CY|A ( A|CY |
|RR |A |;A ( A(0)|A(7..1) |
|RRC |A |;A|CY ( CY|A |
| | | |
|SWAP |A |;A ( A(3..0)|A(7..4) |
Rn ({R0, R1}, Ri ({R0, R1, ..., R7}
DATA MOVE INSTRUCTIONS
| | | |
|MOV |A,#byte |;A ( byte |
|MOV |A,@Rn |;A ( DM(Rn) |
|MOV |A,Ri |;A ( Ri |
|MOV |A,byte |;A ( DM(byte) |
|MOV |@Rn,A |;DM(Rn) ( A |
|MOV |@Rn,#byte |;DM(Rn) ( byte |
|MOV |@Rn,byte |;DM(Rn) ( DM(byte) |
|MOV |Ri,A |;Ri ( A |
|MOV |Ri,#byte |;Ri ( byte |
|MOV |Ri,byte |;Ri ( DM(byte) |
|MOV |byte,A |;DM(byte) ( A |
|MOV |dbyte,#byte |;DM(dbyte) ( byte |
|MOV |byte,@Rn |;DM(byte) ( DM(Rn) |
|MOV |byte,Ri |;DM(byte) ( Ri |
|MOV |dbyte,byte |;DM(dbyte) ( DM(byte) |
|MOV |DPTR,#addr |;DPTR ( addr |
| | | |
|MOVC |A,@A + DPTR |;A ( CM(A+DPTR) |
|MOVC |A,@A + PC |;A ( CM(A+PC) |
| | | |
|MOVX |A,@DPTR |;A ( XM(DPTR) |
|MOVX |A,@Rn |;A ( XM(P2|Rn) |
|MOVX |@DPTR,A |;XM(DPTR) ( A |
|MOVX |@Rn,A |;XM(P2|Rn) ( A |
| | | |
|PUSH |byte |;DM(SP+1) ( DM(byte), SP ( SP + 1 |
|POP |byte |;DM(byte) ( DM(SP), SP ( SP - 1 |
| | | |
|XCH |A,Ri |;A ( Ri |
|XCH |A,byte |;A ( DM(byte) |
|XCH |A,@Rn |;A ( DM(Ri) |
|XCHD |A,@Rn |;A(3..0) ( DM(Rn;3..0) |
Rn ({R0, R1}, Ri ({R0, R1, ..., R7}
PROGRAM AND MACHINE CONTROL
|CALL |Note: Assembler translates CALL to ACALL or LCALL |
|ACALL |short |;DM(SP+2)|DM(SP+1) ( PC+2, |
| | |;PC(10..0) ( short, SP ( SP + 2 |
|LCALL |addr |;DM(SP+2)|DM(SP+1) ( PC+3, |
| | |;PC(15..0) ( addr, SP ( SP + 2 |
|RET | |;PC ( DM(SP)|DM(SP-1), SP ( SP-2 |
|RETI | |;PC ( DM(SP)|DM(SP-1), SP ( SP-2 |
| | |;Reenable equal or lower priority INT |
|JMP |Note: JMP is translated to AJMP, LJMP, or SJMP. |
|AJMP |short |;PC(10..0) ( short |
|LJMP |addr |;PC(15..0) ( addr |
|SJMP |byte |;PC ( PC + 2 + byte(7)..byte(7)|byte |
|JMP |@A+DPTR |;PC ( DPTR + A |
|JZ |byte |;IF A = 0 THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+2 |
|JNZ |byte |;IF A ( 0 THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+2 |
|CJNE |A,dbyte,byte |;IF A ( DM(dbyte) THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;IF A < DM(dbyte) THEN CY ( 1 |
| | |;ELSE CY ( 0 |
|CJNE |A,#dbyte,byte |;IF A ( dbyte THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;IF A < dbyte THEN CY ( 1 |
| | |;ELSE CY ( 0 |
|CJNE |Rn,#dbyte,byte |;IF Rn ( dbyte THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;IF A < DM(dbyte) THEN CY ( 1 |
| | |;ELSE CY ( 0 |
|CJNE |@Rn,#dbyte,byte |;IF DM(Rn) ( dbyte THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;IF A < dbyte THEN CY ( 1 |
| | |;ELSE CY ( 0 |
|DJNZ |Rn,byte |;Rn ( Rn-1, IF (Rn-1) ( 0 THEN |
| | |;PC ( PC + 2 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC + 2 |
|DJNZ |dbyte,byte |;DM(dbyte) ( DM(dbyte)-1, |
| | |;IF (DM(dbyte)-1) ( 0 THEN |
| | |;PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC + 3 |
|NOP | |;PC ( PC + 1 |
BIT MANIPULATION INSTRUCTIONS
| | | |
|CLR |C |;CY ( 0 |
|CLR |byte |;BADM(byte) ( 0 |
|SETB |C |;CY ( 1 |
|SETB |byte |;BADM(byte) ( 1 |
|CPL |C |;CY ( |
|CPL |byte |;BADM(byte) ( [pic] |
|ANL |C,byte |;CY ( CY ( BADM(byte) |
|ANL |C,/byte |;CY ( CY ( [pic] |
|ANL |byte,bit |;BADM(byte) ( BADM(byte) ( bit |
|ORL |C,byte |;CY ( CY ( BADM(byte) |
|ORL |C,/byte |;CY ( CY ( [pic] |
|ORL |byte,bit |;BADM(byte) ( BADM(byte) ( bit |
|MOV |C,byte |;CY ( BADM(byte) |
|MOV |byte,C |;BADM(byte) ( CY |
BIT JUMP INSTRUCTIONS
|JB |dbyte,byte |;IF BADM(dbyte) = 1 THEN |
| | |;PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+3 |
|JNB |dbyte,byte |;IF BADM(dbyte) = 0 THEN |
| | |;PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+3 |
|JBC |dbyte,byte |;IF BADM(dbyte) = 1 THEN |
| | |; BADM(dbyte) ( 0 |
| | |; PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+3 |
|JC |byte |;IF CY = 1 THEN |
| | |;PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+3 |
|JNC |byte |;IF CY = 0 THEN |
| | |;PC ( PC + 3 + byte(7)..byte(7)|byte |
| | |;ELSE PC ( PC+3 |
INSTRUCTIONS THAT AFFECT FLAGS (incomplete)
|Instruction |CY OV AC Z N |Instruction |CY OV AC Z N |
|ADD | X X X X X |CLR bit | 0 - - - - |
|ADDC | X X X X X |CPL bit | X - - |
| | |ANL C,bit | X - - X X |
|SUBB | X X X X X |ANL/ C,bit | X - - X X |
|MUL | X X - X X |ORL C,bit | X - - X X |
|DIV | 0 X - X X |ORL/ C,bit | X - - X X |
|DA | X - - X X |MOV C,bit | X - - - - |
|XRL | - - - X X |CJNE | X - - X X |
| | |CPL A | - - - X X |
|SETB C | 1 - - - - |DEC | - - - X X |
|SWAP A | - - - X X |DJNZ | - - - X X |
|RR, RL | - - - X X |INC | - - - X X |
|RRC, RLC | X - - X X |SLL,SRL,SRA | X - - X X |
EX 8051 ASSEMBLEY LANGUAGE EXAMPLES PAGE 1
1 $MOD51
2 $TITLE(8051 ASSEMBLEY LANGUAGE EXAMPLES)
3 $PAGELENGTH(55) ;SET FOR YOUR PRINTER
4 $PAGEWIDTH(132)
5 $SYMBOLS ;INCLUDE SYMBOLS IN LISTING
6 ;*******************************************************
7 ;
8 ; FUNCTION: EX - 8051 ASSEMBLY LANGUAGE EXAMPLES
9 ;
10 ;******************************************************
11 ;
0038 DSEG AT 38H ;DATA SEGMENT
0038 13 STACK: DS 8 ;RESERVE 8 BYTES FOR STACK
---- 14 CSEG ;CODE SEGEMNT
0000 15 ORG 0
0000 16 RESET:
0000 020030 17 JMP START ;SKIP RESERVED MENORY
0003 18 ORG 3H
0003 19 INTR0: ;LCALL ISR
0003 32 20 RETI
000B 21 ORG 0BH
000B 22 TIME0:
000B 32 23 RETI
0013 24 ORG 13H ;ENTRY POINT FOR INTR1
0013 25 INTR1:
0013 32 26 RETI
001B 27 ORG 1BH
001B 28 TIME1:
001B 32 29 RETI
0023 30 ORG 23H
0023 31 COM:
0023 32 32 RETI
002B 33 ORG 2BH
002B 34 TIME2:
002B 32 35 RETI
36 $EJECT
EX 8051 ASSEMBLEY LANGUAGE EXAMPLES PAGE 2
37 ;START OF PROGRAM
0030 38 ORG 30H
0030 758137 39 START: MOV SP,#STACK - 1 ;INITIALIZE STACK POINTER
---- 40 DSEG ;SWITCH TO DATA
0040 41 X: DS 1 ;RESERVE BYTE FOR X
0041 42 Y: DS 1 ;RESERVE BYTE FOR Y
0042 43 Z: DS 1 ;RESERVE BYTE FOR Z
---- 44 CSEG ;SWITCH BACK TO CODE
45 ;DATA MOVE INSTRUCTIONS
0033 74FF 46 MOV A,#-1 ;LOAD A WITH 0FFH
0035 E7 47 MOV A,@R1 ;LOAD A WITH DATA MEM POINTED TO BY R1
0036 E9 48 MOV A,R1 ;LOAD A WITH CONTENTS OF R1
0037 E560 49 MOV A,2*30H ;LOAD A WITH CONTENTS OF DATA MEM 60H
0039 E5A0 50 MOV A,P2 ;LOAD A WITH CONTENTS OF PORT 2
003B F6 51 MOV @R0,A ;STORE A IN DATA MEM POINTED TO BY R0
003C 77FF 52 MOV @R1,#0FFH ;PUT ALL 1'S IN LOC POINTED TO BY R1
003E A67F 53 MOV @R0,7FH ;READ DATA MEMORY 7FH AND STORE IN
54 ;DATA MEMORY POINTED TO BY R0.
0040 FF 55 MOV R7,A ;STORE A IN REGISTER R7
0041 7E55 56 MOV R6,#01010101B ;PUT 55H IN R6
0043 7850 57 MOV R0,#50H ;LOAD R0 WITH 50H = 80
0045 7F51 58 MOV R7,#01010001B ;LOAD R7 WITH 51H = 81
0047 AD37 59 MOV R5,55 ;PUT CONTENTS OF LOCATION 55 IN R5
0049 F537 60 MOV 55,A ;PUT A IN DATA MEM LOC 55
004B 7537AA 61 MOV 55,#0AAH ;PUT AAH IN DM LOC 55 DECIMAL
004E 85FF90 62 MOV P1,#0FFH ;SET P1 TO ALL 1'S
0051 87A0 63 MOV P2,@R1 ;SET P2 TO DATA MEM POINTED TO BY R1
0053 85B080 64 MOV P0,P3 ;READ PORT 3 AND OUTPUT IT TO P0
0056 858000 65 MOV 0,P0 ;READ PORT 0 AND SAVE IN DATA MEM 0
0059 AAA0 66 MOV R2,P2 ;READ P2 AND SAVE IT IN R2
005B 90006F 67 MOV DPTR,#A_TABLE ;POINT DPTR TO LOOK UP TABLE
005E 740A 68 MOV A,#0AH ;PUT HEX B = 1011 = 11 IN ACC
0060 93 69 MOVC A,@A+DPTR ;CONVERT IT TO ASCII (A = 'B')
0061 E4 70 CLR A ;LOAD A WITH 0
0062 83 71 MOVC A,@A+PC ;PUT OPCODE OF PC+0 (NEXT INST) IN A
0063 D3 72 SETB C ;SET CARRY BIT
0064 103E06 73 JBC 39.6,EXIT ;IF BIT 39.E = 27H.6 = 0B3H IS SET
0067 103E03 74 JBC 27H.6,EXIT ;CLEAR AND JUMP TO EXIT
006A 10BE00 75 JBC 0BEH,EXIT ;ALL THREE ARE THE SAME
006D 80C1 76 EXIT: JMP START ;LOOP FOREVER
006F 77 A_TABLE:
006F 30 78 DB '0' ;PUT ASCII VALUE OF 0 IN CODE MEMORY
0070 31 79 DB '1' ;ASCII 1
0071 32 80 DB '2' ;ASCII 2
0072 33 81 DB '3' ;ASCII 3
0073 34 82 DB '4' ;ASCII 4
0074 35 83 DB '5' ;ASCII 5
0075 36 84 DB '6' ;ASCII 6
0076 37 85 DB '7' ;ASCII 7
0077 38 86 DB '8' ;ASCII 8
0078 39 87 DB '9' ;ASCII 9
0079 41 88 DB 'A' ;ASCII A
007A 42 89 DB 'B' ;ASCII B
007B 43 90 DB 'C' ;ASCII C
007C 44 91 DB 'D' ;ASCII D
007D 45 92 DB 'E' ;ASCII E
007E 46 93 DB 'F' ;ASCII F
94 END
-----------------------
[1] The code memory address space consists of 216 words. Each word contains 8 bits.
[2] Set if accumulator has odd parity.
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