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主片初始化程序段:MOVAL,00010001B;ICW1:边沿,ICW4,ICW3OUT20H,AL;写入ICW1MOVAL,00001111B;ICW2:IR7中断类型号为0FHOUT21H,AL;写入ICW2MOVAL,00000100B;ICW3:主片IR2接从片INTOUT21H,AL;写