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

Hi Dan;

You are absolutely correct; in the case cited, it takes 3 cycles to disable the interrupts.

If you were able to leave the MODE register in the $0B state, then of course it is reduced by one.

Personally, I rearely use the interrupt-on-b feature, as I find it is generally insufficiently deterministic for my needs. My preference is to run an RTCC ISR at a high speed, and do everything on a very steady basis. Of course, if there is a lot to do, or if legitimate inputs may happen very rapidly, this technique may not be optimum.

Cheers,

Peter (pjv)

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