main.c

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#include "cpu_reg.h"

int ms,f;

unsigned  	int  *ExRamStart = (unsigned  int *)0x4000;
void main()
{
	int		i;

     asm("  STM #0000h,CLKMD ");  
     while(*CLKMD & 0x01 );
     asm("  STM #40C7h,CLKMD ");  //设置CPU运行频率＝100M
/*  40C7h:5*clkin  =100M
    30c7h:4*clkin  =80M
    20c7h:3*clkin  =60M
    10C7h:2*clkin  =40M
*/
     asm("  stm   #4240h, SWWSR ");
     //2 wait except for on-chip program 1
     asm("  stm   #00E0h, PMST  "); //MP/MC = 0, IPTR = 001,ovly=0  
     asm("  stm   #0802h, BSCR  "); 
     asm("  STM #0h,IMR ");
     
     asm("  STM #0010h,TCR  "); //关定时器
     asm("  STM #0186ah,PRD  ");//1ms
     asm("  STM #0C2fh,TCR  "); //TCR=最后四位
     asm("  STM #0008h,IFR  ");
     asm("  ORM #0008h,*(IMR) ");/*开时间中断*/
 
     asm("  RSBX  INTM ");      /*开中断*/ 

	 for(i = 0; i < 0xC000; i++)
		{
			*(ExRamStart + i) = 0x5555;
			if(*(ExRamStart + i) != 0x5555)
				{
					while(1);
				}
		}
	
	i = 0;	
	
	for(i = 0; i < 0xC000; i++)
		{
			*(ExRamStart + i) = 0xAAAA;
			if(*(ExRamStart + i) != 0xAAAA)
				{
					while(1);
				}
		}
	
	 for (i=0;i<0xC000;i++)		*(ExRamStart+i)=i;	
     f=2;
     ms=0;
     while(1)
     {
       while(ms<500/f);     //LED_flash
       ms=0;
       asm("  RSBX  XF ");       
       while(ms<500/f);
       ms=0;
       asm("  SSBX  XF ");       
     }

}
	  
interrupt void  timer0()
{
     ms++;
}