I have little project going that makes me wonder what Arduino does behind the scenes. I'm generating a TONE at 50Hz and multiplexing a 2-digit array by reading the 50Hz back with an Interrupt, writing the digits out etc.
I am also generating 38KHz for IR transmission by direct register access to timer4 (This is a 32U4 Leonardo Micro @16MHz).
I did read the source on Tone() but saw only one reference to 32U4 during #define.
Is there a document somewhere that shows us timer usage for various Arduino boards without sifting through source code? How can I be sure I'm not stepping on Arduino with register access?