programming 16f877a in microc... what's with B0?

[b_engine]

Hi,
why is it difficult to use bin0 of all ports as a digital input in pic 16f877a
I tried this simple code and it doesn't work right :

void main() {
trisb.b0=1; trisd.b0=0;
portd.b0=0; portb.b0=0;
while(1){
portd.b0 = portb.b0;}}

but if i changed portb.b0 to portb.b1 it works fine , is there a different way to work with b0?
I'd be glad if someone can help.

 

[boyguitar1]

hi b_engine

void main()
 {
  trisb.b0=1;          // set RB0 as input
  trisd.b0=0;          // set RD0 as Output
  portd.b0=0;         // clear portd bit 0 
  portb.b0=0;         // clear portb bit 0 

while(1)
 {
   portd.b0 = portb.b0;        
 }
}

This case I tried apply 5V by using active high to RB0
It's normally work!! PortD has Level high 5V make LED light!

 

[ibitechs2005]

Please i want to know how to write to microcontroller EEPROM.Any special tools to do this?