a1.asm

Proteus仿真实验经典12例程 Proteus仿真实验经典12例程

			ORG 00H
START:			MOV A,P1
			ANL A,#0F0H
			RR A
			RR A
			RR A
			RR A
			XOR A,#0F0H
			MOV P1,A
			SJMP START
			END