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Appendix J
8051 Instructions in lexical Order
| Abbreviations: |
| direct | = | 8-bit DATA address in internal memory |
| const8 | = | 8-bit constant in CODE memory |
| const16 | = | 16-bit constant in CODE memory |
| addr16 | = | 16-bit long CODE address |
| addr11 | = | 11-bit absolute CODE address |
| rel | = | signed 8-bit relative CODE address |
| bit | = | 8-bit BIT address in internal memory |
|
| i | = | register numbers 0 or 1 |
| n | = | register numbers 0 thru 7 |
| a | = | 32 * m |
| m | = | the 3 most significant bits of an absolute address |
|
| Opcode | Mnemonic | Operands | Bytes | Flags | Cycles |
| 11 + a | ACALL | addr11 | 2 | | | | | 2 |
| 24 | ADD | A, #const8 | 2 | CY | AC | OV | P | 1 |
| 26 + i | ADD | A, @Ri | 1 | CY | AC | OV | P | 1 |
| 25 | ADD | A, direct | 2 | CY | AC | OV | P | 1 |
| 28 + n | ADD | A, Rn | 1 | CY | AC | OV | P | 1 |
| 34 | ADDC | A, #const8 | 2 | CY | AC | OV | P | 1 |
| 36 + i | ADDC | A, @Ri | 1 | CY | AC | OV | P | 1 |
| 35 | ADDC | A, direct | 2 | CY | AC | OV | P | 1 |
| 38 + n | ADDC | A, Rn | 1 | CY | AC | OV | P | 1 |
| 01 + a | AJMP | addr11 | 2 | | | | | 2 |
| 54 | ANL | A, #const8 | 2 | | | | P | 1 |
| 56 + i | ANL | A, @Ri | 1 | | | | P | 1 |
| 55 | ANL | A, direct | 2 | | | | P | 1 |
| 58 + n | ANL | A, Rn | 1 | | | | P | 1 |
| B0 | ANL | C, /bit | 2 | CY | | | | 2 |
| 82 | ANL | C, bit | 2 | CY | | | | 2 |
| 53 | ANL | direct, #const8 | 3 | | | | | 2 |
| 52 | ANL | direct, A | 2 | | | | | 1 |
| B6 + i | CJNE | @Ri, #const8, rel | 3 | CY | | | | 2 |
| B4 | CJNE | A, #const8, rel | 3 | CY | | | | 2 |
| B5 | CJNE | A, direct, rel | 3 | CY | | | | 2 |
| B8 + n | CJNE | Rn, #const8, rel | 3 | CY | | | | 2 |
| E4 | CLR | A | 1 | | | | P | 1 |
| C2 | CLR | bit | 2 | | | | | 1 |
| C3 | CLR | C | 1 | CY | | | | 1 |
| F4 | CPL | A | 1 | | | | P | 1 |
| B2 | CPL | bit | 2 | | | | | 1 |
| B3 | CPL | C | 1 | CY | | | | 1 |
| D4 | DA | A | 1 | CY | | | P | 1 |
| 16 + i | DEC | @Ri | 1 | | | | | 1 |
| 14 | DEC | A | 1 | | | | P | 1 |
| 15 | DEC | direct | 2 | | | | | 1 |
| 18 + n | DEC | Rn | 1 | | | | | 1 |
| 84 | DIV | AB | 1 | CY | | OV | P | 4 |
| D5 | DJNZ | direct, rel | 3 | | | | | 2 |
| D8 + n | DJNZ | Rn, rel | 2 | | | | | 2 |
| 06 + i | INC | @Ri | 1 | | | | | 1 |
| 04 | INC | A | 1 | | | | P | 1 |
| 05 | INC | direct | 2 | | | | | 1 |
| A3 | INC | DPTR | 1 | | | | | 2 |
| 08 + n | INC | Rn | 1 | | | | | 1 |
| 20 | JB | bit, rel | 3 | | | | | 2 |
| 10 | JBC | bit, rel | 3 | | | | | 2 |
| 40 | JC | rel | 2 | | | | | 2 |
| 73 | JMP | @A+DPTR | 1 | | | | | 2 |
| 30 | JNB | bit, rel | 3 | | | | | 2 |
| 50 | JNC | rel | 2 | | | | | 2 |
| 70 | JNZ | rel | 2 | | | | | 2 |
| 60 | JZ | rel | 2 | | | | | 2 |
| 12 | LCALL | addr16 | 3 | | | | | 2 |
| 02 | LJMP | addr16 | 3 | | | | | 2 |
| 76 + i | MOV | @Ri, #const8 | 2 | | | | | 1 |
| F6 + i | MOV | @Ri, A | 1 | | | | | 1 |
| A6 + i | MOV | @Ri, direct | 2 | | | | | 2 |
| 74 | MOV | A, #const8 | 2 | | | | P | 1 |
| E6 + i | MOV | A, @Ri | 1 | | | | P | 1 |
| E5 | MOV | A, direct | 2 | | | | P | 1 |
| E8 + n | MOV | A, Rn | 1 | | | | P | 1 |
| 92 | MOV | bit, C | 2 | | | | | 2 |
| A2 | MOV | C, bit | 2 | CY | | | | 1 |
| 75 | MOV | direct, #const8 | 3 | | | | | 2 |
| 86 + i | MOV | direct, @Ri | 2 | | | | | 2 |
| F5 | MOV | direct, A | 2 | | | | | 1 |
| 85 | MOV | direct, direct | 3 | | | | | 2 |
| 88 + n | MOV | direct, Rn | 2 | | | | | 2 |
| 90 | MOV | DPTR, #const16 | 3 | | | | | 2 |
| 78 + n | MOV | Rn, #const8 | 2 | | | | | 1 |
| F8 + n | MOV | Rn, A | 1 | | | | | 1 |
| A8 + n | MOV | Rn, direct | 2 | | | | | 2 |
| 93 | MOVC | A, @A+DPTR | 1 | | | | P | 2 |
| 83 | MOVC | A, @A+PC | 1 | | | | P | 2 |
| F0 | MOVX | @DPTR, A | 1 | | | | | 2 |
| F2 + i | MOVX | @Ri, A | 1 | | | | | 2 |
| E0 | MOVX | A, @DPTR | 1 | | | | P | 2 |
| E2 + i | MOVX | A, @Ri | 1 | | | | P | 2 |
| A4 | MUL | AB | 1 | CY | | OV | P | 4 |
| 00 | NOP | | 1 | | | | | 1 |
| 44 | ORL | A, #const8 | 2 | | | | P | 1 |
| 46 + i | ORL | A, @Ri | 1 | | | | P | 1 |
| 45 | ORL | A, direct | 2 | | | | P | 1 |
| 48 + n | ORL | A, Rn | 1 | | | | P | 1 |
| A0 | ORL | C, /bit | 2 | CY | | | | 2 |
| 72 | ORL | C, bit | 2 | CY | | | | 2 |
| 43 | ORL | direct, #const8 | 3 | | | | | 2 |
| 42 | ORL | direct, A | 2 | | | | | 1 |
| D0 | POP | direct | 2 | | | | | 2 |
| C0 | PUSH | direct | 2 | | | | | 2 |
| 22 | RET | | 1 | | | | | 2 |
| 32 | RETI | | 1 | | | | | 2 |
| 23 | RL | A | 1 | | | | | 1 |
| 33 | RLC | A | 1 | CY | | | P | 1 |
| 03 | RR | A | 1 | | | | | 1 |
| 13 | RRC | A | 1 | CY | | | P | 1 |
| D2 | SETB | bit | 2 | | | | | 1 |
| D3 | SETB | C | 1 | CY | | | | 1 |
| 80 | SJMP | rel | 2 | | | | | 2 |
| 94 | SUBB | A, #const8 | 2 | CY | AC | OV | P | 1 |
| 96 + i | SUBB | A, @Ri | 1 | CY | AC | OV | P | 1 |
| 95 | SUBB | A, direct | 2 | CY | AC | OV | P | 1 |
| 98 + n | SUBB | A, Rn | 1 | CY | AC | OV | P | 1 |
| C4 | SWAP | A | 1 | | | | | 1 |
| C6 + i | XCH | A, @Ri | 1 | | | | P | 1 |
| C5 | XCH | A, direct | 2 | | | | P | 1 |
| C8 + n | XCH | A, Rn | 1 | | | | P | 1 |
| D6 + i | XCHD | A, @Ri | 1 | | | | P | 1 |
| 64 | XRL | A, #const8 | 2 | | | | P | 1 |
| 66 + i | XRL | A, @Ri | 1 | | | | P | 1 |
| 65 | XRL | A, direct | 2 | | | | P | 1 |
| 68 + n | XRL | A, Rn | 1 | | | | P | 1 |
| 63 | XRL | direct, #const8 | 3 | | | | | 2 |
| 62 | XRL | direct, A | 2 | | | | | 1 |
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