11.8 12位串行da转换器7543接口.txt

《MCS-51单片机应用开发实用子程序》配套的源代码

START:
MOV	A,DBH						
ACALL	ASMBB						
MOV	SBUF,A						
MOV	A,DBL						
ACALL	ASMBB					
MOV	SBUF,A						
MOV	DPTR,#DAAD					
MOVX	@DPTR,A						
RET
ASMBB:
MOV	R6,#00H
MOV	R7,#08H
CLR		C							
ALO:
RLC		A	
XCH		A,R6
RRC		A
XCH		A,R6
DJNZ	R7,ALO
XCH		A,R6
RET