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

Hi Andy;

A couple of things...

Firstly I believe this is due to the pipeline architecture, but am not positive of that.
Secondly, I do believe there is a very brief reference to this in the device spec sheetes, although I can't recall offhand exactly where. Third, this loss of ticks will happen any time you access the RTCC with instructions that operate in a "read-modify-write" manner, but not with those that work in a true "read" manner.
Fourth, I thought that the number of lost counts was three, not four.
Fifth, the IDE in debug will not always indicate the correct count in the RTCC, so please be aware of that. The method you are using; employing the I/O pins to indicate the value is a proper approach.

Cheers,

Peter (pjv)

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