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

Okay by experiments here is what is works out to be:

If the prescaler is 1:8 or higher, the instruction that modifes RTCC is one count.

If the presclaer is 1:1, the instruction that modifies RTCC is three counts.

If the prescaler is 1:2 or 1:4, the instruction that modifes RTCC is five counts.

 

Seems weird, but that is how it works in my experiments. What I did was get the interrupt rate to be the same when I modifed RTCC and when I didn't. If the resulting rate was the same, the calculation must be correct.

 

Bean.

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