SCI串口问题，求帮助

liangliheng · 发表于 2011-4-23 13:29:22

我的程序是这样的
#include <hidef.h>    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */
#include <MC9S12XS128.h>    /* derivative information */
#pragma  LINK_INFO DERIVE"MC9S12XS128.h"
void SetBusCLK_64M(void)
{
CLKSEL=0X00;
PLLCTL_PLLON=1; //turn on PLL
SYNR =0xc0 | 0x07;
REFDV=0xc0 | 0x01;
POSTDIV=0x00;    //pllclock=2*osc*(1+SYNR)/(1+REFDV)=128MHz;
_asm(nop);       //BUS CLOCK=64M
_asm(nop);
_asm(nop);
_asm(nop);
while(!(CRGFLG_LOCK==1)); //锁相环输出稳定
CLKSEL_PLLSEL =1;          //engage PLL to system;
}

void SciInit(void)
{
SCI0BDH=0x01;
   SCI0BDL=0xa0;       //9600bps
   SCI0CR1=0;          //正常8位模式，无奇偶校验
   SCI0CR2=0x2c;       //允许发送
}

void SciWrite(char x)
{
while(!(SCI0SR1&0x80));
SCI0DRH=0;
SCI0DRL=x;
}

void main(void) {
  /* put your own code here */
  SetBusCLK_64M();
  SciInit();

EnableInterrupts;

  for(;;) {

_FEED_COP(); /* feeds the dog */
SciWrite(0x25);
  } /* loop forever */
  /* please make sure that you never leave main */
}
串口调试助手返回来的数值是十六进制的6D.
我的SCI00DRL明明是0x25，为什么返回来的是6D呢？我用的是PS1口单片机输出接到max232，求助，先感谢