I have two 16F628s, one sending commands to the other over the USART
with the baud rate at 31250.  It's working almost flawlessly and I'm
trying to finetune the receiving code to eliminate a couple of annoying
behaviors.  The main loop of the receiving program is doing PWM on 5
pins, each connected to LEDs.  I'm collecting bytes from the serial
port at interrupt time and thought it would be fruitful to experiment
with disabling interrupts during some iterations of the main loop to
see if the interrupt handler is interacting badly with the main loop at
certain points.  I can't seem to get this to work properly.

I've tried to disable/enable just the RX interrupt with:

        bcf     PIE1,RCIE

        (some code)

        bsf     PIE1,RCIE

and I've tried to disable/reenable all interrupts with:

        clrf    INTCON

        (some code)

        movelw  B'11000000'
        movwf   INTCON

In one case, it works very briefly 3-10 seconds and then the receiving
PIC goes into a coma and stops responding completely, in the other case
I appear to be getting serial port errors and it never works at all..

Is there some specific incantation for disabling/enabling rx interrupts
while the port is continuously getting data?  I don't care if I lose a
few commands, I just want to ignore the incoming data briefly and then
start paying attention again.

thanks for any ideas!

darren

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