dem1-9dungngatngoai.c

code for count in Pic use external interrupt

//*****************************************************************************
// Author  : nhh
// Date    : 03/04/06
// Hardware: PIC16F877A
//*****************************************************************************
#include <16F877A.h>
#fuses NOWDT,PUT,XT,NOPROTECT
#use delay(clock=4000000)
#use fast_io(b)
#use fast_io(d)
#byte portb=0x06
#byte portd=0x08
const unsigned char digital[]={0b00000110, 0b01011011, 0b01001111, 0b01100110,\
						0b01101101, 0b01111101, 0b00000111, 0b01111111, 0b01101111};
                  // ma hoa digital duoi dang mang
// Chuong trinh ngat
#int_ext
void ngat_RB0()
{
int i;
   if(i<9)
      {
      portd=digital[i];
      ++i;
      }
   if(i==9)
      {
      i=0;
      }
}
// Chuong trinh chinh
main()
{
set_tris_b(0b00000001);
set_tris_d(0);
enable_interrupts(global);
enable_interrupts(int_ext);
ext_int_edge(H_to_L);
portd=0b00111111;
while(true)
   {
   // chi doi ngat nen vong lap nay ko co gi ca !
   }
}