mach nap PG2 - bao loi

[zonnamtao]

Em viet chuong trinh nap thu cho pic(pic6f877a). dung mach nap PG2 (tu lam). Khi mo chuong trinh nap((winpic800),(PICPgm Programmer)), test hadware thi oke.,veify thi oke.read oke. Nhung khi nap (program)thi bao loi va canh bao khong tim thay pic. . neu sau khi load chuong trinh ma chay read truoc roi sau do program all thi duoc nhung dem pic cam vao boad thi khong co tin hieu gi ca.mach nap do ap giua cac chan dung nhu huong dan(tren picvietnam). khi chay chuong trinh nap den van sang. Mong cac bac giup do.

chuong trinh: thulednhapnhay.c
#include <16F877A.h>
#FUSES NOWDT, HS, NOPUT, NOPROTECT, NODEBUG, NOBROWNOUT,NOLVP, NOCPD, NOWRT
#use delay(clock=4000000)
#byte portb=0x06
#use fast_io(b)
void main()
{
set_tris_b(0x00);
while(1)
{
portb=0x00;
delay_ms(250);
portb=0xff;
delay_ms(250);
}
}