设置如下：
unsigned short pwmizhouqi=256;
  LPC_TMR16B1->TCR = 0;   
  LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);  
  LPC_TMR16B1->TCR = 0;  

   LPC_IOCON->PIO1_9 = 0X01;

  LPC_TMR16B1->MR0 = pwmizhouqi/2;
  
   LPC_TMR16B1-> PWMC = 0x01;

  LPC_TMR16B1-> PR=22;   

  LPC_TMR16B1->MCR = 0x0400;

  LPC_TMR16B1->MR3 = pwmizhouqi;  
  
  LPC_TMR16B1->CTCR = 0x00;

    LPC_TMR16B1->TCR = 1;
麻烦指点一下， 此帖出自小平头技术问答