TIMER implements one COMPARE event for every available capture/compare register.
When the counter value becomes equal to the value specified in a capture compare register CC[n], the corresponding compare event COMPARE[n] is generated.
BITMODE specifies how many Counter and capture/compare register bits are used when the comparison is performed. Other bits are ignored.
The COMPARE event can be configured to operate in one-shot mode by configuring the corresponding ONESHOTEN[n] register. After writing CC[n], a COMPARE[n] event is generated the first time the Counter matches CC[n].