10.1.4拨码盘接口.txt

MCS－51单片机应用开发实用子程序.rar

BCDIN:
MOV	R0,#50H					
MOV	R1,#51H					
SETB	P3.0	
MOV	A,P1	
CPL		A						
MOV	@R1,A					
CLR		P3.0						
MOV	A,P1						
CPL		A						
MOV	@R0,A					
RET