AVR timer calculator

https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf

If I understand correctly AVR datsheet, partiularly for ATmega328p, section 15.9.2, OCRnA value is calculated by:

OCRnA  = F_OCnA/ F_clkIO / N - 1

For instance, for 1s timer, prescaler 1024 and 16-bit timer, the value should be 15624. On the web page result is 15625.

https://www.simulide.com/p/blog-page_8.html

On various sources, calculators shows either result, but according to datasheet, only one is correct.

Perhaps also to add prescaler value and resolution for complete calculation.

I will have a look to that javascript, but you are probably right, 15625 is the period in cycles and 15624 the match value.

Perhaps also to add prescaler value and resolution for complete calculation.

Good idea.