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Can you tell me : If an interrupt routine using (say) registerbank 2 calls a subroutine, does the subroutine have to be specified as using registerbank 2 as well? If so, what is the best way of specifying a routine that may be called from both the foreground and an interrupt?
In C51 there is a way to tell the compiler to generate register bank independent code for a given function. Then you could call such a function from either an ISR or mainline code using the normal cautions of course. Without this, you must call functions in the same register bank. - Mark
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