T0 as timer assembly program (interrupt method)-EEWORLD

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Assembly program for using MCU T0 as timer to realize digital tube display (interrupt method)

The circuit is: P0 port is connected to the font code pen segment of the digital tube, and P2 port is connected to the digital selection end of the digital tube.

下面是汇编语言源程序：
SECOND EQU 30H
   TCOUNT EQU 31H
    ORG 00H
    LJMP START
    ORG 0BH
    LJMP INT0X
START: MOV SECOND ,#00H
    MOV A,SECOND
    MOV B,#10
    DIV   AB
    MOV DPTR,#TABLE
    MOVC A,@A+DPTR
    MOV P0,A
    MOV A,B
    MOVC A,@A+DPTR
    MOV P2,A
    MOV TCOUNT,#00H
    MOV TMOD,#01H
    MOV TH0,#(65536-50000)/256
    MOV TL0,#(65536-50000) MOD 256
    SETB TR0
    SETB ET0
    SETB EA
    SJMP $
INT0X: MOV TH0,#(65536-5000)/256
           MOV TL0,#(65536-5000) MOD 256
     INC TCOUNT
     MOV A,TCOUNT
     CJNE A,#20,NEXT
     MOV TCOUNT,#00H
     INC SECOND
     MOV A,SECOND
     CJNE A,#60,NEX
     MOV SECOND,#00H
NEX: MOV A,SECOND
      MOV B,#10
      DIV AB
      MOV DPTR,#TABLE
      MOVC A,@A+DPTR
      MOV P0,A
      MOV A,B
      MOVC A,@A+DPTR
      MOV P2,A
NEXT: RETI
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH
       END

T0 works in mode 1, timing 50ms, a total of 20 cycles, totaling 1 second.

P0 port displays low, P2 port displays high, and resets to zero when 60 is reached

Reference address：T0 as timer assembly program (interrupt method)

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