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

The interrupt rate must be within the range obtainable by using the prescaler and RETURNINT value.
So for 60 Hz the clock must be 60*65536 or less, so that is about 3.9MHz.
Otherwise you will have to use a multiple and use a counter in the interrupt.

Bean.

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