Hi ozion,

First rule of interrupts, Never Wait for anything.

Interrupt handlers should execute as fast as possible, and exit as soon as possible.

With 18F's you can get away with using HSERIN/HSEROUT with Waits and Pauses, by putting them in a LOW priority interrupt handler. But with the 16F's, you don't have that option.

If you want to use interrupts to receive serial data on 16F's, then you should only grab 1 byte at a time then exit. You can keep track of how many bytes have been received and set a Flag when finished so that it can be dealt with in the Main loop. Then you can HSEROUT to your hearts content.

Otherwise, do all the serial stuff in the main loop, RX and TX. The main loop should run fast enough to catch everything. And the interrupts will continue on like they should.

HTH,
  Darrel