#include <16F877.h>
#device adc=8
#FUSES NOWDT ,XT
#use delay(clock=4000000)
void main()
{
set_tris_b(0x00);
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
output_b(0x00);
while(true){
output_b(0xff);
delay_ms(500);
output_b(0x00);
delay_ms(500);
}
}