xunhuan.asm

定时器的应用

NUM2    EQU     1FH
NUM3    EQU     0FFH
        ORG     0000H
        LJMP    START
TABLE:DB  3FH,18H,76H,7CH,59H,6DH,6FH,38H
      DB  38H,3FH,18H,76H,7CH,59H,6DH,6FH
      DB  6FH,38H,3FH,18H,76H,7CH,59H,6DH
      DB  6DH,6FH,38H,3FH,18H,76H,7CH,59H
      DB  59H,6DH,6FH,38H,3FH,18H,76H,7CH
      DB  7CH,59H,6DH,6FH,38H,3FH,18H,76H
      DB  76H,7CH,59H,6DH,6FH,38H,3FH,18H
      DB  18H,76H,7CH,59H,6DH,6FH,38H,3FH
START:  MOV     R4,#00H
LOOP3:  MOV     30H,R4
        MOV     R2,#00H
LOOP2:  MOV     R3,#00H
LOOP1:  MOV     R0,#00H
        MOV     R1,30H
SHOW:   MOV     A,R0
        CPL     A
        MOV     R6,A
        CLR     A
        ADD     A,R1
        MOV     DPTR,#TABLE
        MOVC    A,@A+DPTR
        MOV     R5,A
        MOV     P1,#00H
        MOV     P2,R6
        MOV     P1,R5
        INC     R0
        INC     R1
        CJNE    R0,#08H,SHOW
        INC     R3
        CJNE    R3,#NUM3,LOOP1
        INC     R2
        CJNE    R2,#NUM2,LOOP2
        MOV     A,R4
        ADD     A,#08H
        MOV     R4,A
        CJNE    R4,#40H,LOOP3
        LJMP    START
        END