參考資訊：
http://www.keil.com/support/man/docs/is51/is51_opcodes.htm
| Hex | Bytes | Mnemonic | Operands |
|---|---|---|---|
| 00 | 1 | nop | |
| 01 | 2 | ajmp | addr11 |
| 02 | 3 | ljmp | addr16 |
| 03 | 1 | rr | a |
| 04 | 1 | inc | a |
| 05 | 2 | inc | direct |
| 06 | 1 | inc | @r0 |
| 07 | 1 | inc | @r1 |
| 08 | 1 | inc | r0 |
| 09 | 1 | inc | r1 |
| 0a | 1 | inc | r2 |
| 0b | 1 | inc | r3 |
| 0c | 1 | inc | r4 |
| 0d | 1 | inc | r5 |
| 0e | 1 | inc | r6 |
| 0f | 1 | inc | r7 |
| 10 | 3 | jbc | bit, offset |
| 11 | 2 | acall | addr11 |
| 12 | 3 | lcall | addr16 |
| 13 | 1 | rrc | a |
| 14 | 1 | dec | a |
| 15 | 2 | dec | direct |
| 16 | 1 | dec | @r0 |
| 17 | 1 | dec | @r1 |
| 18 | 1 | dec | r0 |
| 19 | 1 | dec | r1 |
| 1a | 1 | dec | r2 |
| 1b | 1 | dec | r3 |
| 1c | 1 | dec | r4 |
| 1d | 1 | dec | r5 |
| 1e | 1 | dec | r6 |
| 1f | 1 | dec | r7 |
| 20 | 3 | jb | bit, offset |
| 21 | 2 | ajmp | addr11 |
| 22 | 1 | ret | |
| 23 | 1 | rl | a |
| 24 | 2 | add | a, #immed |
| 25 | 2 | add | a, direct |
| 26 | 1 | add | a, @r0 |
| 27 | 1 | add | a, @r1 |
| 28 | 1 | add | a, r0 |
| 29 | 1 | add | a, r1 |
| 2a | 1 | add | a, r2 |
| 2b | 1 | add | a, r3 |
| 2c | 1 | add | a, r4 |
| 2d | 1 | add | a, r5 |
| 2e | 1 | add | a, r6 |
| 2f | 1 | add | a, r7 |
| 30 | 3 | jnb | bit, offset |
| 31 | 2 | acall | addr11 |
| 32 | 1 | reti | |
| 33 | 1 | rlc | a |
| 34 | 2 | addc | a, #immed |
| 35 | 2 | addc | a, direct |
| 36 | 1 | addc | a, @r0 |
| 37 | 1 | addc | a, @r1 |
| 38 | 1 | addc | a, r0 |
| 39 | 1 | addc | a, r1 |
| 3a | 1 | addc | a, r2 |
| 3b | 1 | addc | a, r3 |
| 3c | 1 | addc | a, r4 |
| 3d | 1 | addc | a, r5 |
| 3e | 1 | addc | a, r6 |
| 3f | 1 | addc | a, r7 |
| 40 | 2 | jc | offset |
| 41 | 2 | ajmp | addr11 |
| 42 | 2 | orl | direct, a |
| 43 | 3 | orl | direct, #immed |
| 44 | 2 | orl | a, #immed |
| 45 | 2 | orl | a, direct |
| 46 | 1 | orl | a, @r0 |
| 47 | 1 | orl | a, @r1 |
| 48 | 1 | orl | a, r0 |
| 49 | 1 | orl | a, r1 |
| 4a | 1 | orl | a, r2 |
| 4b | 1 | orl | a, r3 |
| 4c | 1 | orl | a, r4 |
| 4d | 1 | orl | a, r5 |
| 4e | 1 | orl | a, r6 |
| 4f | 1 | orl | a, r7 |
| 50 | 2 | jnc | offset |
| 51 | 2 | acall | addr11 |
| 52 | 2 | anl | direct, a |
| 53 | 3 | anl | direct, #immed |
| 54 | 2 | anl | a, #immed |
| 55 | 2 | anl | a, direct |
| 56 | 1 | anl | a, @r0 |
| 57 | 1 | anl | a, @r1 |
| 58 | 1 | anl | a, r0 |
| 59 | 1 | anl | a, r1 |
| 5a | 1 | anl | a, r2 |
| 5b | 1 | anl | a, r3 |
| 5c | 1 | anl | a, r4 |
| 5d | 1 | anl | a, r5 |
| 5e | 1 | anl | a, r6 |
| 5f | 1 | anl | a, r7 |
| 60 | 2 | jz | offset |
| 61 | 2 | ajmp | addr11 |
| 62 | 2 | xrl | direct, a |
| 63 | 3 | xrl | direct, #immed |
| 64 | 2 | xrl | a, #immed |
| 65 | 2 | xrl | a, direct |
| 66 | 1 | xrl | a, @r0 |
| 67 | 1 | xrl | a, @r1 |
| 68 | 1 | xrl | a, r0 |
| 69 | 1 | xrl | a, r1 |
| 6a | 1 | xrl | a, r2 |
| 6b | 1 | xrl | a, r3 |
| 6c | 1 | xrl | a, r4 |
| 6d | 1 | xrl | a, r5 |
| 6e | 1 | xrl | a, r6 |
| 6f | 1 | xrl | a, r7 |
| 70 | 2 | jnz | offset |
| 71 | 2 | acall | addr11 |
| 72 | 2 | orl | c, bit |
| 73 | 1 | jmp | @a+dptr |
| 74 | 2 | mov | a, #immed |
| 75 | 3 | mov | direct, #immed |
| 76 | 2 | mov | @r0, #immed |
| 77 | 2 | mov | @r1, #immed |
| 78 | 2 | mov | r0, #immed |
| 79 | 2 | mov | r1, #immed |
| 7a | 2 | mov | r2, #immed |
| 7b | 2 | mov | r3, #immed |
| 7c | 2 | mov | r4, #immed |
| 7d | 2 | mov | r5, #immed |
| 7e | 2 | mov | r6, #immed |
| 7f | 2 | mov | r7, #immed |
| 80 | 2 | sjmp | offset |
| 81 | 2 | ajmp | addr11 |
| 82 | 2 | anl | c, bit |
| 83 | 1 | movc | a, @a+pc |
| 84 | 1 | div | ab |
| 85 | 3 | mov | direct, direct |
| 86 | 2 | mov | direct, @r0 |
| 87 | 2 | mov | direct, @r1 |
| 88 | 2 | mov | direct, r0 |
| 89 | 2 | mov | direct, r1 |
| 8a | 2 | mov | direct, r2 |
| 8b | 2 | mov | direct, r3 |
| 8c | 2 | mov | direct, r4 |
| 8d | 2 | mov | direct, r5 |
| 8e | 2 | mov | direct, r6 |
| 8f | 2 | mov | direct, r7 |
| 90 | 3 | mov | dptr, #immed |
| 91 | 2 | acall | addr11 |
| 92 | 2 | mov | bit, c |
| 93 | 1 | movc | a, @a+dptr |
| 94 | 2 | subb | a, #immed |
| 95 | 2 | subb | a, direct |
| 96 | 1 | subb | a, @r0 |
| 97 | 1 | subb | a, @r1 |
| 98 | 1 | subb | a, r0 |
| 99 | 1 | subb | a, r1 |
| 9a | 1 | subb | a, r2 |
| 9b | 1 | subb | a, r3 |
| 9c | 1 | subb | a, r4 |
| 9d | 1 | subb | a, r5 |
| 9e | 1 | subb | a, r6 |
| 9f | 1 | subb | a, r7 |
| a0 | 2 | orl | c, /bit |
| a1 | 2 | ajmp | addr11 |
| a2 | 2 | mov | c, bit |
| a3 | 1 | inc | dptr |
| a4 | 1 | mul | ab |
| a5 | reserved | ||
| a6 | 2 | mov | @r0, direct |
| a7 | 2 | mov | @r1, direct |
| a8 | 2 | mov | r0, direct |
| a9 | 2 | mov | r1, direct |
| aa | 2 | mov | r2, direct |
| ab | 2 | mov | r3, direct |
| ac | 2 | mov | r4, direct |
| ad | 2 | mov | r5, direct |
| ae | 2 | mov | r6, direct |
| af | 2 | mov | r7, direct |
| b0 | 2 | anl | c, /bit |
| b1 | 2 | acall | addr11 |
| b2 | 2 | cpl | bit |
| b3 | 1 | cpl | c |
| b4 | 3 | cjne | a, #immed, offset |
| b5 | 3 | cjne | a, direct, offset |
| b6 | 3 | cjne | @r0, #immed, offset |
| b7 | 3 | cjne | @r1, #immed, offset |
| b8 | 3 | cjne | r0, #immed, offset |
| b9 | 3 | cjne | r1, #immed, offset |
| ba | 3 | cjne | r2, #immed, offset |
| bb | 3 | cjne | r3, #immed, offset |
| bc | 3 | cjne | r4, #immed, offset |
| bd | 3 | cjne | r5, #immed, offset |
| be | 3 | cjne | r6, #immed, offset |
| bf | 3 | cjne | r7, #immed, offset |
| c0 | 2 | push | direct |
| c1 | 2 | ajmp | addr11 |
| c2 | 2 | clr | bit |
| c3 | 1 | clr | c |
| c4 | 1 | swap | a |
| c5 | 2 | xch | a, direct |
| c6 | 1 | xch | a, @r0 |
| c7 | 1 | xch | a, @r1 |
| c8 | 1 | xch | a, r0 |
| c9 | 1 | xch | a, r1 |
| ca | 1 | xch | a, r2 |
| cb | 1 | xch | a, r3 |
| cc | 1 | xch | a, r4 |
| cd | 1 | xch | a, r5 |
| ce | 1 | xch | a, r6 |
| cf | 1 | xch | a, r7 |
| d0 | 2 | pop | direct |
| d1 | 2 | acall | addr11 |
| d2 | 2 | setb | bit |
| d3 | 1 | setb | c |
| d4 | 1 | da | a |
| d5 | 3 | djnz | direct, offset |
| d6 | 1 | xchd | a, @r0 |
| d7 | 1 | xchd | a, @r1 |
| d8 | 2 | djnz | r0, offset |
| d9 | 2 | djnz | r1, offset |
| da | 2 | djnz | r2, offset |
| db | 2 | djnz | r3, offset |
| dc | 2 | djnz | r4, offset |
| dd | 2 | djnz | r5, offset |
| de | 2 | djnz | r6, offset |
| df | 2 | djnz | r7, offset |
| e0 | 1 | movx | a, @dptr |
| e1 | 2 | ajmp | addr11 |
| e2 | 1 | movx | a, @r0 |
| e3 | 1 | movx | a, @r1 |
| e4 | 1 | clr | a |
| e5 | 2 | mov | a, direct |
| e6 | 1 | mov | a, @r0 |
| e7 | 1 | mov | a, @r1 |
| e8 | 1 | mov | a, r0 |
| e9 | 1 | mov | a, r1 |
| ea | 1 | mov | a, r2 |
| eb | 1 | mov | a, r3 |
| ec | 1 | mov | a, r4 |
| ed | 1 | mov | a, r5 |
| ee | 1 | mov | a, r6 |
| ef | 1 | mov | a, r7 |
| f0 | 1 | movx | @dptr, a |
| f1 | 2 | acall | addr11 |
| f2 | 1 | movx | @r0, a |
| f3 | 1 | movx | @r1, a |
| f4 | 1 | cpl | a |
| f5 | 2 | mov | direct, a |
| f6 | 1 | mov | @r0, a |
| f7 | 1 | mov | @r1, a |
| f8 | 1 | mov | r0, a |
| f9 | 1 | mov | r1, a |
| fa | 1 | mov | r2, a |
| fb | 1 | mov | r3, a |
| fc | 1 | mov | r4, a |
| fd | 1 | mov | r5, a |
| fe | 1 | mov | r6, a |
| ff | 1 | mov | r7, a |