In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

Marcus,
  You are right. The pause values should be DIVIDED by 1.19
  50MHz would probably be overkill. If it works at 4MHz all the less power you will need.
  The way I got 1.19 was that I used SX-Sim and it told me that the interrupt uses 8 clocks.
  So the interrupt is called every 50 clocks, so it uses 8 of every 50 clocks. So the main program get 42 of every 50 clocks.
  50/42 = 1.19

  If you want to be really accurate you would have a counter in the interrupt routine, then you could determine the exact number of 40KHz pulses you wanted the signal to be on/off. You would probably need a faster clock to do that. 

Bean.

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