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

John,

The port B interrupts are edge detecting, so you won't have retriggering until you get a valid transition.  And yes, you can do what you want in SX/B; for example:

INTERRUPT

ISR_Start:
  WKPND_B = rbStatus                  ' get bits that changed

  IF rbStatus.0 = 1 THEN
    INC secs
    IF secs = 60 THEN
      secs = 0
      mins = mins + 1
      IF mins = 60 THEN
        mins = 0
        hours = hours + 1
      ENDIF 
    ENDIF
  ENDIF

  IF rbStatus.1 = 1 THEN
    INC rain
  ENDIF

ISR_Exit:
  WKEN_B = %00000000                  ' reload
  RETURNINT

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