Цитата Сообщение от Gelip Посмотреть сообщение
What is rate in this setting: clock[0].rate=1/2 Is this is 3500/2=1750KHz ?
Yes, multiplier 1, divisor 2.

---------- Post added at 17:13 ---------- Previous post was at 17:03 ----------

I have used this info. In this document there is a table with divisors, for musical note A (440 Hz) is used 15*256+137=3977. And 3977*440=1749880 Hz, thus the clock frequency of the timer is the half of CPU clock.