| Miscellaneous functions | |
| _BREAK | Programmed breakpoint |
| _NOP | NOP |
| _OPC | Insert an opcode |
| _SLEEP | Put processor to sleep |
| _WDR | Reset the watchdog |
| Status register manipulation | |
| _CLI | Disable interrupts and return original status register |
| _SEI | Enable interrupts and return original status register |
| disable_interrupt | Disable interrupts and return original status register |
| enable_interrupt | Enable interrupts and return original status register |