how to control the incoming data?

[Ioannis]

If it is one off then I suggest to re-design your PCB. You won't have satisfactory results whatever you do besides the Interrupts generated by the USART.

There may be plenty of ideas, but will not respond fast enough.

Ioannis

[mister_e]

RB6 can use Interrupt on change, so yes you can use it.

It show one problem though, it will detect the Start-Bit... so there's big chance that SERIN/DEBUGIN/SERIN2 will not work as expected. But you could roll your own serial routine which will ignore the start-bit. This will work or not depending of your Baudrate and if you go on a ASM or PBP interrupt + home made serial routine. When using Darrel's instant interrupt with PBP type, it need some time to save/restore PBP systems var. Have a look at the following
http://darreltaylor.com/DT_INTS-14/kudos.html

If you create your own PC software, OR if you create your own transmitter with another PIC... then it open a few other possibilities.

But yeah, when at all possible, I prefer the USART interrupt as well.