>     Hello guys, every program i wrote that uses the serial port crashes
> the system if there are many characters arriving at the same time, or
> the pic is doing another thing and not expecting serial data.

        Which system is crashing, the PIC or the PC?

>     So i just tried to disable usart port and enable when need, but did
> not work too. Is it the correct aproach? How could I turn on/off 16F627
> serial port after its been setu?

        It sounds like you are missing flow control, this can either be done in
software (in the protocol between the devices, or using a more "common" form
of flow control) or in hardware (using the CTS, RTS lines). TTYL

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