PICKit 2 USART

[skimask]

You haven't enabled the serial port according to the PBP manual. All you've done is set the baud rate. That's it. HSERIN/HSEROUT are talking to a register that 'doesn't care' until you set the right DEFINEs.
Have a look, add the code, see what happens.

[DragonBall_6]

Hi

I had added in the Define as below. I'm using PIC16F877A and 4 MHz.
I enter "a" and click send. There are nothing echo back. "a" only show once when the echo button is checked.
Any idea???

DEFINE OSC 4

DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 20h
DEFINE HSER_BAUD 9600
DEFINE HSER_SPBRG 6
DEFINE HSER_CLROERR 1

datain VAR BYTE

main:

     HSerin [datain]
     HSerout [datain]
     
GoTo main

Any suggestion ???

Thanks

Peter

[skimask]

Did you try swapping the Rx/Tx pins on one end?
And while you're at it, try 2400 baud, instead of 9600. Yes, 9600 should work...but 2400 should be a bit more reliable if there are other problems.