| # | Instruction | Description |
| 1 | andi | logical AND with immediate value |
| 2 | breq | branch if equal |
| 3 | brne | branch if not equal |
| 4 | dec | decrement |
| 5 | ldi | load immediate value |
| 6 | lds | load from data memory space |
| 7 | lpm | load from program memory space |
| 8 | lsl | logical shift left |
| 9 | lsr | logical shift right |
| 10 | mov | copy register |
| 11 | or | logical OR |
| 12 | ori | logical OR with immediate value |
| 13 | out | store to I/O location |
| 14 | pop | pop from the stack |
| 15 | push | push onto the stack |
| 16 | rcall | relative subroutine call |
| 17 | ret | return from subroutine |
| 18 | rjmp | relative unconditional jump |
| 19 | sts | store in data memory space |
| 20 | tst | test for zero or minus |