求解STM8S003 TIM2 IAR不能写入寄存器问题

只看该作者 · 2014-8-20 15:02

STM8S003  TIM2 PWM无输出，发现写不入寄存器，,直接在IAR仿真时手动修改就能正常输出PWM，不知为什么,求原因
void TIM2_Init(void)
{
   TIM2_ARRH = 0x27;  //设定重装载值
   TIM2_ARRL = 0x10;  //
   TIM2_CCR1H = 0;  //设置占空比
  TIM2_CCR1L = 20;  //
   TIM2_CCER1 = 0x01;  //高电平有效，开启输出
  TIM2_CCMR1 = 0x68; ////PWM模式1;通道2PWM输出
  TIM2_CR1 = 0x01;  //计数使能
}

写入寄存器后结果
TIM2_ARRH =0x00
TIM2_ARRL = 0x14
TIM2_CCR1H = 0x00
TIM2_CCR1L = 0x00
TIM2_CCER1 = 0x00
TIM2_CCMR1 = 0x00
TIM2_CR1 = 0x01;