In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Dan;

When dealing with interrupts, and NOT directly messing with the RTCC, it takes 3 cycles to get in, and 3 cycles to get out. Under those circumstances, never have I experienced any cycles lost "in the confusion". That said, when the RTCC is directly accessed by a write, or a read-modify-write, (but not with a mov w,RTCC) then several (three as I recall) cycles are not counted in the RTCC. No confusion here. As stated previously this is without the use of a pre-scaler.

Bean's discoveries are quite interesting, and I'll have to make some tests on that so that I can fully appreciate his comments.

There is some confusion as to what the IDE indicates as the value of RTCC while in interrupt in DEBUG. I believe the count is out by one.

Cheers,

Peter (pjv)

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