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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?
Yes, if the registerbank is different your data will almost definately get corrupted at some point. The method i have used is to declare #pragma registerbank ( ? ) at the start of a file that then only contaians the functions for that registerbank ( including the interrupt ).