51单片机延时0.5s和20ms的程序(汇编) 12M晶振答:DELAY_20MS: ;60H,61H,62H MOV 62H,#26 MOV 61H,#5 MOV 60H,#74 DJNZ 60H,NOP DJNZ 61H,$-7 DJNZ 62H,$-13 RET ;--- LCALL DELAY_500MS ;包括lcall和返回一共0.5s,误差0us DELAY_500MS: ;60H,61H,62H MOV 62H,#10 MOV 61H,#102 MOV 60H,#243 DJNZ 60...