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Hi: I use AT89C51,I have a problem in my software to useit and that's the time that one instruction takes to execute,I mean it's so long, I think that is because of multiply instruction(ASM:MUL AB).Please let me know if it is right or not? if freq>60HZ >> int0&int1 don't work my chip's frequency is 8MHz. Thank you
MUL AB and DIV AB are the only two instructions that take 4 machine cycles to execute. All the rest take 1 or 2 cycles. But I don't think this should make a problem. "if freq>60HZ >> int0&int1 don't work my chip's frequency is 8MHz." What do you exactly mean? Could you specify it? (give more details, ie. show a piece of program, etc.)