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

If I remember right your clock was 4MHz and the Prescaler was 1:128 so 4,000,000Hz(clock) / 128(prescaler) = 31250Hz(RTCC clock) / 250(returnint value) = 125 interrupts per second.

You had 4,000,000Hz(clock) / 128(prescaler) = 31250Hz(RTCC clock) / 156(returnint value) = 200.3205 interrupts per second

The easiest way to count ISR cycles is to let SXSim do it for you.
But with ReturnInt = 250 and prescaler = 128, your ISR can take up to 32000 cycles (okay a little less) without problems.

Bean.

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