显示程序2.txt

共有 45 个程序源码

        ORG  0000H   ；这是利用动态扫描原理显示两位静态59数字的源程序       
        MOV SP,#40H
        MOV  P1,#0FFH
        MOV  P2,#0FFH
        MOV  P0,#0FFH
        MOV  20H,#1
        MOV  21H,#2
        MOV  22H,#3
DSP:	  MOV DPTR,#TAB
  	  MOV A,20H
	  MOVC A,@A+DPTR
RX1:	  MOV P1,A
	  CLR P0.0
          DJNZ R7,RX1
          MOV R7,#0FFH
	  MOV P1,#0FFH
          SETB P0.0
	  MOV A,21H
	  MOVC A,@A+DPTR
RX2:	  MOV P1,A
	  CLR P0.1
          DJNZ R7,RX2
          SETB P0.1
          MOV R7,#0FFH
	  MOV P1,#0FFH
          SETB P0.1
	  MOV A,22H
	  MOVC A,@A+DPTR
RX3:	  MOV P1,A
	  CLR P0.2
          DJNZ R7,RX3
          SETB P0.2
          AJMP DSP
TAB: DB 60H,7DH,0D0H,58H,4DH;0/1/2/3/4/5/6/7/8/9/
     DB 4AH,42H,7CH,40H,48H

	END