MCS-51单片机应用子程序：11.2 12位AD转换器AD578AD678AD1678接口

START: MOV DPTR,#9000H MOVX DPTR,A LOOP: MOVX A,@DPTR JB ACC.7,LOOP MOVX A,@DPTR MOV 20H,A MOV DPTR,#6000H MOVX A,@DPTR MOV 21H,A RET