Hserout questions

Hi All

Attempting to get some serial communication working with a 16f628 (4Meg Xtal) My defines are as below :-


DEFINE OSC 4
DEFINE HSER_TXSTA 24h
DEFINE HSER_RCSTA 90h
DEFINE HSER_BAUD 9600
DEFINE HSER_SPBRG 25

It works sometimes but not reliably ..... Any issues with above, ///maybe external xtal too slow ?

Just looking for a little guidance.

BR
Andy