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Hello Every : I use AT89C52 and 11.059MHz oscillator. 1 instuction takes about 1 micro-second.(10^-6 sec.) I write a delay function in *.asm. It works well , but I want it adjustable. I want to delay according to the parameter I pass.My goal is to modify delay time for some protocol time slot testing. I found it some how difficult to achieve. Because the basic instruction , for example : _nop_ , take 1 micro-second. I can't add more decision. It will takes more time. How could I implement such kind of delay? Please give me a hand , thanks a lot~~