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

How are you detecting this 'skipping' of the ISR?  

You may already know this, but if using the debugger sometimes you will see the ISR, and sometimes you won't.  The only way to use the debugger to test for ISR performance is to put a breakpoint in the ISR.

When I get this problem, and I am detecting the ISR entrance by some signal generated within the ISR, the problem has always been in my signal generation logic.  Make sure the ISR is not using any variables that are used by the main program unles you mean to do this.  Also make sure the ISR doesn't alter any banks (FSR) that the main program doesn't know about.  Finally, make sure the main program is not changing the RTCC counter.

 

Nate

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