三星单片机主程序只跑一次就停了，why？

只看该作者 · 2012-9-3 11:21

.public       main
      .public       start
      .include       "S3C8275.reg"

;//==============define symbol==============
page0to0       equ 00h
page1to1       equ 11h
page0to2       equ 20h
page1to2       equ 21h
page2to0       equ 02h
powerkey       equ 0fah ;;//

; ==================intterupt define=====================
;;    vector 00f6h, watch_timer_int ;// irq2 watch timer vector
      org 0100h
      jp    start

;;//=============reset===================================

start:
      nop
      nop
      ld    spl,# 0ffh
      call init_hardware

;//=========main program=================================
   org    200h
main:

      sb0
  ;    ld    p4,#0ffh
      ld    r0,#0
      ld    r1,#1
      ldb p0.3,r0
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay

      ldb p0.3,r1

      call delay
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay
      call delay

      jp    main

;;//=================================================sub

init_hardware:
      di
;//------------chen xu chu shi hua
      ld    btcon,# 10100011b  ;//disable WATCH DOG
      ld    clkcon,# 00011000b ;fxx

      ld    imr,#00000101b ;.3bit external inter(P0.0) ;.2bit  watchtime ;.0bit Timer1
      ld    sym,# 01h
      ld    pp,# page0to0
;//------------sb0------------------------------------
      sb0
      ld    osccon,# 04h  ;//main oscillator select
      ld    stpcon,# 10100101b

      ld    p0conh,# 00000010b
      ld    p0conl,# 10101010b
      ld    p0pur,# 0ffh

      ld    p0,# 0ffh

;    ld    p1conh,# 00h
;    ld    p1conl,# 00h
  ;    ld    p1,# 0ffh
;    ld    p1pur,# 0ffh

;       ld    p2conh,# 00h
;       ld    p2conl,# 00h

  ;    ld    p2pur,# 0ffh

;       ld    p3conl,# 00h
;       ld    p3conh,# 00h
;    ld    p3,# 7fh
;       ld    p3pur,# 0ffh

;       ld    extipnd,# 00h    ;//清除中断标志位
;       ld    exticonh,# 00h
;       ld    exticonl,#00000001b  ;p00 set falling edge into inter

;//------------sb1--------------------------
      sb1
      ld    wtcon,# 01001110b ;;//0.91ms 中断;
;       ld    tadata,# 0ffh
;       ld    tbdata,# 0ffh
      ld    tacon,# 10111110b ;set fxx/8

  ;    ld    p4conh,# 0aah
  ;    ld    p4conl,# 10101010b
;       ld    p4,#0ffh

;       ld    p5conh,# 10101010b
;       ld    p5conl,# 10101010b
;       ld    p5,00h

;       ld    p6con,# 000h
;    ld    lcon,# 01100001b
;//------------clear ram------------------------
      sb0
      ld    pp,#page0to0
;    call rampage0clr

      ei

      ret

;//================delay================================

delay:

push
pp

push
r0

ld
pp,#00h
            ld    r0,#16-3
d50:

nop

djnz
r0,d50

pop
r0

pop
pp
            ret

      END