nc power.asm

实现单片机按键输入控制电压输出。并显示输出电压值。

ORG 00H
START:MOV R4,#04H
      MOV R0,#30H
CLEAR:MOV @R0,#00H
      INC R0
      DJNZ R4,CLEAR
L1:   MOV R3,#0EFH
      MOV R1,#00H
L2:   MOV A,R3
      MOV P1,A
      MOV A,P1
      MOV R4,A
      SETB C
      MOV R5,#03H
L3:   RRC A
      JNC KEYIN
      INC R1
      DJNZ R5,L3
      CALL DISPLAY
      MOV A,R3
      SETB C
      RLC A
      MOV R3,A
      JC  L2
      JMP L1
KEYIN:MOV R7,#60
D2:   MOV R6,#248
      DJNZ R6,$
      DJNZ R7,D2
D3:   MOV A,P1
      XRL A,R4
      JZ  D3
      MOV A,R1
      MOV DPTR,#TABLE
      MOVC A,@A+DPTR
      XCH  A,30H
      XCH  A,31H
      XCH  A,32H
      XCH  A,33H
      MOV A,32H
      ADD A,#10
      MOV 32H,A
      MOV A,33H
      CJNE A,#10,S2
      S2:JC HH
        SUBB A,#10
        MOV 33H,A
   HH:MOV A,30H
      CJNE A,#11,T1 
      MOV 30H,#0
      MOV A,33H
      MOV B,#100
      MUL AB
      MOV 36H,A
      MOV A,32H
      SUBB A,#10
      MOV B,#10
      MUL AB
      MOV 37H,A
      MOV A,31H
      ADD A,37H
      ADD A,36H
      MOV P0,A
   T1:CALL DISPLAY
      JMP L1
   
      
DISPLAY:MOV A,30H
        CALL DIS
        MOV P3,#01111111B
        CALL DELAY2
        MOV A,31H
        CALL DIS
        MOV P3,#10111111B
        CALL DELAY2
        MOV A,32H
        CALL DIS
        MOV P3,#11011111B
        CALL DELAY2
        MOV A,33H
        CALL DIS
        MOV P3,#11101111B
        CALL DELAY2
        RET
   DIS:
        MOV DPTR,#TAB
        MOVC A,@A+DPTR
        MOV P2,A
        RET
TAB: DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,40H,79H,24H,30H,19H,12H,2H,78H,0H,10H;0,1,2,3,4,5,6,7,8,9,0.,1.,2.,3.,4.,5.,6.,7.,8.,9.

DELAY:MOV R7,#06
D1:   MOV R6,#248
      DJNZ R6,$
      DJNZ R7,D1
      RET
DELAY2:MOV 34H,#10
D5:    MOV 35H,#100
       DJNZ 35H,$
       DJNZ 34H,D5
       RET

TABLE: DB   01,02,03
       DB   04,05,06
       DB   07,08,09
       DB   10,00,11