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

You'll need to determine the lowest common denomiator -- timing-wise -- run your ISR at that and then divide it up for your various VPs.  Here's a butt-simple example:

[code]' =========================================================================
  INTERRUPT 1_000
' =========================================================================

  INC led1Timer
  IF led1Timer = 100 THEN
    TOGGLE Led1
    led1Timer = 0
  ENDIF

  INC led2Timer
  IF led2Timer = 133 THEN
    TOGGLE Led2
    led2Timer = 0
  ENDIF

  IF led3Timer = 221 THEN
    TOGGLE Led3
    led3Timer = 0
  ENDIF

  RETURNINT[/code]

The ISR runs every millisecond; LED #1 gets toggled every 100 ms, LED #2 gets toggled every 133 ms, and LED #3 gets toggled every 221 ms.  The example is not really practical, but demonstrates that for each of your VPs you may need to keep track of separate dividers.

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