It operates on 16-bit registers, which are mapped to the 8051’s registers as follows:
The multiplication instructions store the result in a 32-bit register seemingly accessible as the MRES0-3 SFRs.
| Instruction bits | Mnemonic |
|---|---|
| 10100101 00000000 0000XxYy | add16 |
| 10100101 00000000 0001XxYy | add16 |
| 10100101 00000000 0010YyXx | add16 |
| 10100101 00000000 0011XxYy | addc16 |
| 10100101 00000000 0100XxYy | addc16 |
| 10100101 00000000 0101YyXx | addc16 |
| 10100101 00000000 0110XxYy | add16s |
| 10100101 00000000 0111XxYy | add16s |
| 10100101 00000000 1000YyXx | add16s |
| 10100101 00000000 1001XxYy | addc16s |
| 10100101 00000000 1010XxYy | addc16s |
| 10100101 00000000 1011YyXx | addc16s |
| 10100101 00000000 1100XxYy | sub16 |
| 10100101 00000000 1101XxYy | sub16 |
| 10100101 00000000 1110YyXx | sub16 |
| 10100101 00000000 1111XxYy | subc16 |
| 10100101 00000001 0000XxYy | subc16 |
| 10100101 00000001 0001YyXx | subc16 |
| 10100101 00000001 0010XxYy | sub16s |
| 10100101 00000001 0011XxYy | sub16s |
| 10100101 00000001 0100YyXx | sub16s |
| 10100101 00000001 0101XxYy | subc16s |
| 10100101 00000001 0110XxYy | subc16s |
| 10100101 00000001 0111YyXx | subc16s |
| 10100101 00000001 1000XxYy | anl16 |
| 10100101 00000001 1001XxYy | anl16 |
| 10100101 00000001 1010YyXx | anl16 |
| 10100101 00000001 1011XxYy | orl16 |
| 10100101 00000001 1100XxYy | orl16 |
| 10100101 00000001 1101YyXx | orl16 |
| 10100101 00000001 1110XxYy | xrl16 |
| 10100101 00000001 1111XxYy | xrl16 |
| 10100101 00000010 0000YyXx | xrl16 |
| 10100101 00000010 0001XxYy | mac16 |
| 10100101 00000010 0010XxYy | mac16 |
| 10100101 00000010 0011XxYy | mac16s |
| 10100101 00000010 0100XxYy | mac16s |
| 10100101 00000010 0101XxYy | mov16b |
| 10100101 00000010 0110YyXx | mov16b |
| 10100101 00000011 00ZzXxYy | lsl16k |
| 10100101 00000011 01ZzXxYy | lsr16k |
| 10100101 00000011 10ZzXxYy | rotl16k |
| 10100101 00000011 11ZzXxYy | asr16k |
| 10100101 00000100 | rotl8 |
| 10100101 00000101 | rotr8 |
| 10100101 00000110 | mul16wr wr4, wr2 |
| 10100101 00000111 | mul16swr wr4, wr2 |
| 10100101 00001Yyy | rotl8k |
| 10100101 000100Xx | inc16 |
| 10100101 000101Xx | inc216 |
| 10100101 000110Xx | dec16 |
| 10100101 000111Xx | dec216 |
| 10100101 001000Xx | rotl16 |
| 10100101 001001Xx | rotr16 |
| 10100101 001010Xx | rotl16 |
| 10100101 001011Xx | rotr16 |
| 10100101 001100Xx | lsr16 |
| 10100101 001101Xx | lsl16 |
| 10100101 001110Xx | lsr16 |
| 10100101 001111Xx | lsl16 |
| 10100101 010000Xx | asr16 |
| 10100101 010001Xx | asr16 |
| 10100101 010010Xx | movsa |
| 10100101 010011Xx | movsb |
| 10100101 010100Xx | mov8bta |
| 10100101 010101Xx | movat8b |
| 10100101 0110XxYy | cmp16 |
| 10100101 0111XxYy | mov8bb |
| 10100101 1000XxYy | mov16 |
| 10100101 1001YyXx | mov16 |
| 10100101 1010XxYy | mov16 |
| 10100101 1011XxYy | mov16 |
| 10100101 1100XxYy | mul16 |
| 10100101 1101XxYy | mul16 |
| 10100101 1110XxYy | mul16s |
| 10100101 1111XxYy | mul16s |