[TheHouse]

Độan code này mình viết y chang trong ebook, nhưng ngõ ra CCP1 không có tín hiệu.

#include <16f877a.h>
#use delay(clock=20000000)
#fuses HS, NOWDT


int duty_cycle, control_bits, hold_value;

void main()
{
   port_b_pullups(TRUE);
   setup_timer_2(T2_DIV_BY_1, 99, 1);
   setup_ccp1(CCP_PWM);
   
   while(true)
   {
   hold_value = (~(input_b()) & 0x7);
   while ((control_bits = (~(input_b()) & 0x7)) == hold_value);
   
      switch (control_bits)
      {
         case 0x1: duty_cycle = 35;
               break;
         case 0x2: duty_cycle = 59;
               break;
         case 0x4: duty_cycle = 94;
               break;
         default: duty_cycle = 0;
         
         
      }
   }

}