[tranvankien_bk]

chao cac bac !Em viet doan code nhu sau :

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

#byte PORTA         =0x05
#byte PORTB         =0x06
#byte PORTC         =0x07
#byte PORTD         =0x08
#byte PORTE         =0x09

#byte TRISA     =0x85
#byte TRISB     =0x86
#byte TRISC     =0x87
#byte TRISD     =0x88
#byte TRISE     =0x89



//---------------------------------------------------------------
void main(void)
{

   TRISA=0b000000;
   TRISB=0xff;
   TRISC=0xff;
   TRISD=0xff;
   TRISE=0xff;

    while(1)
    {

   PORTa=0b111111;
   delay_ms(1500);
   porta=0b000000;
   delay_ms(1500);

     };

) khi em thu tren proteus thi chan RA4 khong co tin hieu ra ?
ngoai ra khi em nap cho pic de chay thu trên mạch thi khong thay led nhap nhay ?
bac nao biet nguyen nhân chỉ dum em vói!!!!!!!!
em cam on truoc nha