Specifications

Reserved Hardware
On the ATmega128RFA1, SNAP uses Timer 4 and Timer 5 internally.
Timer 4 provides the 1 millisecond “heartbeat” and Timer 5 is used in some sleep modes.
Do not peek()/poke() these timers!
The remaining timers are available for use by your scripts (for example, PWM).
SNAP Reference Manual Document Number 600-0007K Page 161 of 202