.mmregs
         .include "c5xx.inc"    ;"init54x.inc"
         .def MAIN_START
         .def timer0_rev  
STACK    .usect "STACK",20h
         .data
  TIM0   .set 0024h ;定時(shí)器0的TIM 寄存器地址
  PRD0   .set 0025h ;定時(shí)器0的PRD 寄存器地址
  TCR0   .set 0026h ;定時(shí)器0的TCR 寄存器地址
 t0_flag .set 0060h ;定義輸出判別標(biāo)志
 t0_counter .usect "vars"，1 ;定義計(jì)數(shù)長度變量

          .text
MAIN_START:
         
     STM  #0000h，SWWSR
     STM  #0010h，TCR0  ; TCR TSS=1 ，關(guān)斷定時(shí)器0
     STM  #039999，TIM0 ;TIM0賦初值
     STM  #039999，PRD0 ;PRD0賦初值
     ST   #0，t0_flag   
     STM  #0269h ， TCR0 ;黃舳