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

Hi,

I appended a program to perform a single context switch using the secret instructions.
My goal is to have a single userdefined interrupt routine, that executes outside the isr.
Several issues:
1)
I save register M manually but since the context switch is done inside the isr (the real isr via rtcc)
M gets restored to whatever value it had upon entering the isr. How to restore M to
its value before running the misr (mainlevel interrupt)
2)
Upon finishing the misr (which runs as mainlevel code outside isr) I await the next
rtcc interrupt before returning to the normal mainlevel code. Is it possible to do 
a context switch outside isr that will never be interrupted by an rtcc interrupt.
This to avoid the wait.
3)
I use bank0 to save registers and skipped the first 4 bytes as these are used by SX/B.
The others are not as far as I know. Please tell me if these are used and for what purpose.

regards peter

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