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/***********************************************************************/
/*                                                                     */
/*  FILE        :uart.c                                                */
/*  DATE        :Thu, May 27, 2008                                     */
/*  DESCRIPTION :uart program file.                                    */
/*  CPU GROUP   :M30290                                                */
/*  by          :liufeng                                               */
/*                        */
/*                                                                     */
/***********************************************************************/
#include "sfr_M16C29config.h"
void delay(void);
void clock_initial(void);
void uarttx_initial(void);
void uartrx_initial(void);
void port_initial(void);
void main(void)
{  
 clock_initial();
 port_initial();
 uarttx_initial();
 //uartrx_initial();
 asm("NOP"); 
 asm("NOP"); 
}

void clock_initial(void)     //时钟初始化配置
{
 unsigned char i;
    prc1 = 1;
 pm20 = 0;
 prc1 = 0;
 
 prc0 = 1;        //允许写时钟
 
 prc2 = 1;
 pacr=0x03;        //80引脚版本
 
 prc1 = 1;        // Enable write to PM0,PM1,PM2,TB2SC,INVC0 and INVC1 registers 
 pm21 = 0;         // System clock protective bit

 cm10=0;cm05=0;
 for(i=0; i<10; i++);
 cm15=1;                                  //High drive capacity selected(cm1 bit 5)
 cm07=0;cm21=0;cm11=0;                    //Main clock selected(cm0 bit 7,cm1 bit1,cm2 bit 1)
 cm16=0;cm17=0;cm06=1;                    //CPU clock divide by 8 selected(cm0 bit 6, cm1 bit 6 and 7)
 pclk5=0;cm01=0;cm00=0;                   //CLKout pin function as normal I/O port P90(pclkr bit 5,cm0 bit 0 and 1)

 prc0 = 1;
 pclk1 = 1;         //f1SIO set  
 prc0 = 0;         //写时钟保护，   系统时钟8分频 
}

void uarttx_initial(void)      //串口发送
{
 unsigned int trans_data;  //发送REG
 
 trans_data = 0x0011;
 u0brg = 0x81;
 ucon = 0x00;
 u0c0 = 0x30;
 u0c1 = 0x00;
 u0mr = 0x05;
 u0tb = trans_data;
  u0c1 = 0x05;
 
 
 trans_data = ucon;
 trans_data = u0c0;
 trans_data = u0c1;
 trans_data = u0tb;  
 trans_data = u0c1;   
 /*
 clk0_u0c0=0;
 clk1_u0c0=0;
 u0brg = 0x81;
 
 u0mr = 0x05;
 te_u0c1=0;
 re_u0c1=0;
 
 clk0_u0c0=0;
 clk1_u0c0=0;
 asm("NOP");
 u0brg = 0x00;        // Setting UART0 bit rate generator (Approx 9600bps @20MHz f1)必须在U0C0后  

 crd_u0c0 = 1;       //禁止CTS  RTS
  
 ucon = 0x01;
 
 u0tb = trans_data;
 u0brg = 0x81;
 

 te_u0c1=1;
 re_u0c1=1;
 
 u0brg = 0x81;
 u1brg = 0x81;
 
 ti_u0c1 = 0;
*/

 while (1)
 {
  p9_0 = 1;
  u0tb = trans_data;
  
  
  while (ti_u1c1 == 0);   //Wait for transmission buffer emty
   u0tb = trans_data;         // Set transmission data
  te_u1c1 = 1;           // Transmission enabled
  p9_0 = 0;
  trans_data++;
 } 
}

void uartrx_initial(void)     //串口接收
{
 unsigned int recevie_data;   //接收REG
 pd6_1 = 0;
 pd6_2 = 0;        //RXD direction bit
 pd6_3 = 1;        //TXD direction bit
 u0mr = 0x05;
 u0c0 = 0x00;
 u0brg = 0x81;        /* Setting UART0 bit rate generator (Approx 9600bps @20MHz f1)必须在U0C0后 */
 ucon = 0x00;
 u0c1 = 0x05;
 while (1)
 {
  while (!ri_u0c1)
   {
    ;
  }
  recevie_data = u0rb;
  asm("NOP"); 
  asm("NOP"); 
 }
}

void delay(void)       //p9_0 LED delay
{
 unsigned int j,k;
 j = 0;
 k = 0;
 for (;j<3000;j++);
 for (;k<6000;k++); 
}

void port_initial(void)
{
 prc2 = 1;         // Enable write to PD9,PACR and S4C registers
 pd9_0 = 1;        //P9 direction bit
 
 pd6_1 = 0;        // CLK direction bit
 pd6_2 = 0;        //RXD direction bit
 pd6_3 = 1;        //TXD direction bit
 
}

还是不行，是不是硬件上有特别的要求

谢谢shiley指导