做点阵LED动态扫描，LED出现很快的闪烁

zyh19941117

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */
#include "MC9S12XS128.h"

static unsigned char j = 0;
uchar LedChar[] = {0x3C,0x3C,0x3C,0x00,0x00,0x3C,0x3C,0x3C};

#pragma CODE_SEG __NEAR_SEG NON_BANKED


void interrupt 16 TOI_ISR(void)
{

  TFLG2_TOF = 1;
  PORTA = 0xff;
  switch(j)
  {
      case 0: PORTB_PB5=0; PORTB_PB6=0; PORTB_PB7=0; break;
      case 1: PORTB_PB5=1; PORTB_PB6=0; PORTB_PB7=0; break;
      case 2: PORTB_PB5=0; PORTB_PB6=1; PORTB_PB7=0; break;
      case 3: PORTB_PB5=1; PORTB_PB6=1; PORTB_PB7=0; break;
      case 4: PORTB_PB5=0; PORTB_PB6=0; PORTB_PB7=1; break;
      case 5: PORTB_PB5=1; PORTB_PB6=0; PORTB_PB7=1; break;
      case 6: PORTB_PB5=0; PORTB_PB6=1; PORTB_PB7=1; break;
      case 7: PORTB_PB5=1; PORTB_PB6=1; PORTB_PB7=1; break;
      default: break;
  }
  PORTA=LedChar[j++];

}

#pragma CODE_SEG DEFAULT

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

  TSCR1_TEN = 1;   //中断使能
  TSCR2_TOI = 1;   //溢出中断允许
  TC0 = 0xfacb;    //赋初值，1ms
  DDRB=0xff;
  PORTB_PB4=1;
  DDRA = 0xff;
  PORTA = 0xff;
  EnableInterrupts;
  for(;;)
  {
    if(j>=8) j=0;
  } /* loop forever */
  /* please make sure that you never leave main */
}