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

I don't believe you quite understand the nature of the RTCC pin, when configured for external counting (step 1), it increments the RTCC counter, if you have also enabled the RTCC inturrupt (setp 2), the ISR will be called after the RTCC rolls over from 255 to 0. Now if you use the RTIW instruction you can set the RTCC to a specific value (step 3), meaning you could get it to call the ISR each time the RTCC pin is pulsed. But you must do all three things for that to occur.

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