Initialize Secondard Timers optionWhen an Arduino sketch runs, prior to Setup() being called, a hidden init() function is called to set up the hardware. One of the things it does is configure the timers. Timer0 (used for millis) is always configured, but on the x313 series, due to the extremely limited flash, it is optional whether to initialize Timer1. If Timer1 is not initialized, Tone() and PWM on pins 12 and 13 will not work.
Aw, man, I looked at those docs, too. I didn't realize there were other docs beyond the main one. Thanks.
ATtinyCore UniversalThis core supports the following processors - essentially every ATtiny processor that makes sense to use with Arduino. Click the processor name for part-specific information: