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

If _PARAMCNT is loaded with the number of arguments for any gosub,
then you cannot use gosub in the interrupt section because that will
destroy _PARAMCNT, unless the sub called from isr happens to have
an identical number of parameters.
I also know that most subroutines have a fixed number of parameters
and therefore _PARAMCNT is hardly ever used, but still, this could lead
to some erratic program behaviour, which might not be repeatable,
and therefore almost impossible to debug.

regards peter

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