CCS Compiler: Interrupts

#include <16f876A.h>

#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=4000000)

inthdl_ext();


void main() {
   
   SET_TRIS_A ( 0b11111010 );
   SET_TRIS_B ( 0b00000001 );
   SET_TRIS_C ( 0b00000000 );
   
   enable_interrupts(INT_EXT);
   ext_int_edge(H_TO_L);

}

#INT_EXT
inthdl_ext() {
   output_bit(PIN_A2, 1);
   delay_ms(2000);
   output_bit(PIN_A2, 0);
}

                              T
                             ---
                +5V----o-----o o------o--------------- Key 1 IN
                       |              |
                       |              o->|-o
                       |      T            |
                       |     ---           |
                       o-----o o------o----|---------- Key 2 IN
                       |              |    |
                       |              o->|-o
                       |      T            |
                       |     ---           |
                       o-----o o------o----|---------- Key 3 IN
                                      |    |
                                      o->|-o---------- interrupt IN


                                     3x 1N4148
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