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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
Hi, nope, MUL AB takes 48 clock cycles, here it is 6,0mks only. 60Hz is about 17ms so MUL is about 0.036% of timers frequncy. If you use ASM-language so probably your problem is that you do not save some using registers while timers ISR --- PSW is the first candidate which has not been saved often and often by ASM programmers (= good days!