#include <hidef.h>      /* common defines and macros */
#include <mc9s12xdp512.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xdp512"

void MCUInit(void)
{
   
     SYNR    = 0x02;    //时钟合成寄存器
     REFDV   = 0x01;    //时钟分频寄存器
                        //锁相环产生的时钟频率f=2*foscclk*(SYNR+1)/(REFDV+1)
                        //对于S12dg128 16MHz外部晶体振荡器，总线时钟为24MHz
                        //片内系统时钟为48MHz
     /*等待锁相环频率锁定*/
     while((CRGFLG & 0x08) !=0x08);
     CLKSEL |= 0x80;    //时钟选择寄存器
}

void SCIInit(void)
{
    unsigned char t;
    SCI0BDL = 0x9c;   
    SCI0BDH = 0x00;    
    SCI0CR1 = 0x00;    
    t=SCI0DRL;        
    t=SCI0SR1;       
    SCI0CR2 = 0x2C;
    
    SCI1BDL = 0x9c;   
    SCI1BDH = 0x00;    
    SCI1CR1 = 0x00;    
    t=SCI1DRL;        
    t=SCI1SR1;       
    SCI1CR2 = 0x0C;   
}

void put_char0(unsigned char c)
{
  while ((SCI0SR1 & 0X80) == 0);//D7=1时说明要发送的数据已经移入移位寄存器
                                //可以发送新的数据
  SCI0DRL=c;
}

void put_char(unsigned char c)
{
  while ((SCI1SR1 & 0X80) == 0);//D7=1时说明要发送的数据已经移入移位寄存器
                                //可以发送新的数据
  SCI1DRL=c;
}

void delay(){
   unsigned int i;
   for(i=0;i<3000;i++);
   for(i=0;i<2000;i++);      
}

void main(void) {
   MCUInit();
   DDRB=0XFF;
   PORTB=0X00;
   SCIInit();
   EnableInterrupts;
   for(;;)
 {          
   put_char('A');
   delay();   
   }
 }
 interrupt void SCI1_ISR(void){
  unsigned char ch;
  asm sei
  if((SCI0SR1 & 0x20))
  PORTB^=0XFF;
  ch=SCI0DRL;
  put_char0(ch);
  put_char0(' ');
 // PORTB=0x0F;    //读数据寄存器
  //输出完一个字符后跟着输出一个空格
  asm cli
}