EEPW论坛

请帮忙看一下程序，中断可以进，
为什么不能连续输出脉冲？设成连续模式也还是不行。在复位后只可以看到一个脉冲。
用30281
先谢谢了。
void init_pwm(void)
{

    /* induced voltage signal input setting */
    int4ic = 0x00;                      /* set both edge */
    int3ic = 0x00;
    int5ic = 0x00;
    ifsr = 0xf8;                      
   
    /* three-phase PWM initial setting */
    ictb2 = 1;                          /* one TB2 underflow interrupt */
    prcr  = 0x02;
    invc0 = 0x07 ;                    /* sawtooth modulation mode, no two active at an instance */
    invc1 = 0x50;          /* invalid short-circuit protection time, active */
    prcr  = 0x00;
     prcr  = 0x02;
    tb2sc = 0x00;
    idb0 = 0x30;                      /* set three-phase output buffer register 0 */
    idb1 = 0x30;                        /* set three-phase output buffer register 1 */
    prcr  = 0x00; 
    ta1mr = 0x13;                       /* one-shot pulse mode */
    ta2mr = 0x12;                       /* one-shot pulse mode */
    ta4mr = 0x12;                       /* one-shot pulse mode */
    tb2mr = 0x00;                       /* timer mode */
    trgsr = 0x45;                      /* trigger select register TB2 trigger */
    tb2 = 0xfff- 1;             /* carrier cycle */
    ta4 = ta1 = ta2 = 0x8ff;    /* initial DUTY */
   tb2ic = 0x06;                     /* TB2 interrupt enable */
 tabsr |= 0x96;                     /* tiemr count start */
    prcr  = 0x02;
 invc0 |= 0x08;                      /* output enable */
    prcr  = 0x00;
    asm("fset I");
}

/*/////////////////////////////////////////////////////////////////////////////
// PWM Interrupt Enable  pwm 中断设置初始化
//////////////////////////////////////////////////////////////////////////////*/

void    pwm_int(void)
{
 stg_i++;
 if (stg_i >= 6)
 {
  stg_i=0;
  if (stg_p <= 10) stg_p++;
  else stg_p=0;
 }
 

   idb0 = pwm_out_tbl0[stg_p];
        idb1 = pwm_out_tbl1[stg_p];
    tb2 = 0xfff- 1;             /* carrier cycle */
    ta4 = ta1 = ta2 = 0x8ff;    /* initial DUTY */
 tabsr |= 0x96;                     /* tiemr count start */
     tb2sc = 0x00;

}