帮忙看一下~!

只看该作者 · 2007-8-18 16:13

我用的片子是16F505,想让C口的1,2位输出一个脉冲信号,程序如下:
    list p=16F505

    #include "p16F505.inc"

    org    0x000
    goto  MAIN
; '__CONFIG' directive is used to embed configuration word within .asm file.
; The lables following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.


MAIN
       BSF  STATUS,PA0
       MOVLW 0x00
       MOVWF  OSCCAL  ;;内部RC晶振校准
       CLRWDT
       CLRF  TMR0
       BCF  STATUS,PA0
       MOVLW  b'00000000'
       OPTION
       BCF  STATUS,PA0
       MOVLW  b'00001111'   ;;;;;;;;;;;;;;;;;;端口B
       TRIS PORTB
       MOVLW  b'00000000'   ;;;;;;;;;;;;;;;;;;端口C
       TRIS PORTC
START
    BSF PORTC,1
     BSF PORTC,2
    MOVLW 0x59
    MOVWF 0x55
    DECFSZ 0x55,1
    GOTO $-1
    MOVLW 0X00
    MOVWF PORTC
    MOVLW 0x10       ;;50us  jinzhoukexin
    ;MOVWF AA       ;CHAO  SHENG  MAI KUAN 81uS
    ;DECFSZ   AA,1
    MOVLW 0x59
    MOVWF 0x56
    DECFSZ 0x56,1
    GOTO $-1
    GOTO START
; remaining code goes here
    END                       ; directive 'end of program'

但写完单片不知道为什么不出,是不是程序上的毛病?硬件也看了,没有那错了,请高手赐教,谢谢~!