Don't return from Interrupt!

[BigWumpus]

Argh,

if you want to use interrupts to receive serial input - use hardware !!!!!
Access direct the registers and place an inverter into the serial signal !

Using SERIN will lead you to big trouble !

[Toley00]

Thank you for the adviced I will use HSERIN instead of SERIN.

P.S. : If someone make to work the Hardware serial Port on the PIC16F688 with the Hserout command please let me know how you did it...