need a higher PWM-frequency
I need PWM with at least 500Hz on 4 pins (3,5,6,9; pin 10 and 11 are needed for SPI communication).
On 16 Mhz this would be fine, because pin 5 and 6 would have 1000Hz and pin 3 and 9 500Hz, but on 8Mhz its 500 and 250Hz.
I hoped to get along without replaceing the whole board, as I already soldered it in (maybe this was not my best idea...).
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