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Hi, The compile error is: WARNING L15: MULTIPLE CALL TO SEGMENT SEGMENT: ?PR?_STRTONUM?PARSE CALLER1: ?PR?TC0?PERIPHERAL CALLER2: ?C_C51STARTUP The callers TC0 is an ISR using reg bank 2 and I don't know about the c51startup. The called function STRTONUM is using the directive of #pragma NOAREGS so can be called for any functions. The question is why I still got the multiple call error? Thanks for answering my question. By the way, C51 is V6.21, BL51 is V4.21 and LIB51 is V4.20. chao.
That's the sort of thing I had in mind in the last sentence (the C routine making other changes to IE). The compiler has to play it safe for the general case. In my case, I have the advantage of some extra information about what the routines are doing, so preserving IE modification isn't a problem. I suddenly panicked that I had overlooked some subtle 8051-ism about disabling interrupts and just hadn't noticed the error in the lab yet.