MCS-51单片机应用子程序：12.1.2 P0口的扩展使用实例

MOV R0,}#73H MOV A,#88H MOVX @R0,A MOV R1,#20H MOV R2,#32H LOOP: MOV R0,@72H LOOP1: MOW A, @R0 JB ACC.7,LOOP1 MOV R0,#70H MOV A, @R1 MOVX @R0,A INC R1 MOV R0,#73H MOV A,#00H MOVX @R0,A MOV A, #01H MOVX @R0,A DJN R2,LOOP RET