The atmega series contains two main type of timers: 8bit and 16bit. The avrforth timer driver attempts to treat both types as consistently as possible. All timer specific words begin with tx, where x is the timer number. Certain configuration constants are shared between all timers.
| word | stack | description |
|---|---|---|
| txcnt | ( -- a ) | counter register |
| txovfint | ( -- bit ) | overflow interrupt enable |
| txovfflag | ( -- bit ) | overflow interrupt flag |
| 'txovf | ( -- a ) | overflow interrupt vector |
| txclk | ( x -- ) | clock configuration |
| txwgm | ( x -- ) | waveform generation mode configuration |
| txocy | ( -- a ) | output compare register |
| txocyint | ( -- bit ) | output compare interrupt enable |
| tcocyflag | ( -- bit ) | output compare interrupt flag |
| 'txocy | ( -- a ) | output compare interrupt vector |
| txocy | ( x -- ) | output compare pin action configuration |
| txic | ( -- a ) | input capture register |
| txicint | ( -- bit ) | input capture interrupt enable |
| txicflag | ( -- bit ) | input capture interrupt flag |
| 'txic | ( -- a ) | input capture interrupt vector |
| txicf | ( -- bit ) | input capture noise cancelling filter enable |
| txice | ( x -- ) | input capture edge configuration |
These constants can be passed to txclk to
control the clock configuration of synchronous timers.
These constants can be passed to txclk to control
the clock configuration of timers with asynchronous ability (even if
asynchronous mode is not used).
These constants can be passed txwgm to configure
a timer's waveform generation mode.
These constants can be passed to txocy
to configure an output compare channel's compare action. y is
the letter of the output compare channel. Timers with only one output
compare channel still use the name txoca for
consistency.
These constants can be passed to txice to
configure an input capture channel's detection edge.