MCS－51单片机应用开发实用子程序.rar

				MOV  	R0, #30H			
				MOV  	R1, #10H			
				MOV  	R7,#3			
				CLR  	C 				
				LOOP:     	
				MOV  	A, @R0			
				SUBB 	A, @R1			
				MOV  	@R1, A			
				INC  	R0				
				INC  	R1
				DJNZ  	R7, LOOP      
				RET