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Dear all, When I am writing some ASM function, I always need to PUSH the accumulator and all register I have used inside the function. I am wondering if this ASM function is to be called by other C function, do I still need to PUSH the accumulator and the register? It seems that the C compiler will avoid saving some useful data into the accumulator and the register that may need to be retrived after the ASM function call. Best Regards, H.K. Chan
Or even more directly: http://www.keil.com/support/man/docs/c51/c51_ap_regusage.htm Though it's probably a good idea to read that whole section of the manual.