原创 学习NEC单片机二-----定时中断

/*use TM50 timer control LED,use Frh 8M,8000000/8192=976.5Hz,f0=240,240/976.5=0.24S,0.24*20=4.8S*/
#pragma sfr
#pragma di     /*close interrupt*/
#pragma ei     /*open  interrupt*/
#define   UINT8 unsigned char
#define   UINT16 unsigned int
#pragma interrupt INTTM50 vect_INTTM50

UINT16 counter = 0;

void init_TM50()
{
  TCE50 = 0;    /*stop timer50*/
  CRC00 = 0;
  TCL50 = 0x07;
  CR50 = 0xf0;
  TMC50 = 0x85;
  TMIF50 = 0;
  TMMK50 = 0;
}  

void restart_TM50()
{
TMIF50 =0;
TCE50 = 0;
TCE50 = 1;
}

void main()
{
 IMS = 0xc8;   /*fast RAM 1024byte,32kbROM*/  
 IXS = 0x0c;     
 OSCCTL = 0x00;
 PCC = 0x00; /*main systerm time,Fcpu=Fxp*/     
 RCM = 0x82;   /*stop lrstop,open rstop*/
 MOC = 0x80;  /* stop X1 or EXCLK*/    
 MCM = 0x05;     /*high systerm time*/
 PM6 = 0xf0;
 P6 = 0xff;
 
 DI();          /*stop INT*/
 init_TM50();
 restart_TM50();
 EI();

 while( 1 )
 {
   ;
 }
 
 }
 
__interrupt void vect_INTTM50(void)
{
 counter ++;
 
 if( counter >= 20 )
 {
    counter = 0;
    P6 = ~P6;
 }
}