Which chip do i use?

[The Master]

I dont want anyone to write all my code for me but a few examples would be nice.

So, I cant use serin2 like i normally would. The rest of that bit is a bit confusing. Are you saying that i should have a main loop that keeps an eye on serial data coming in and when it reaches a certain length then deal with it however i would if it had just come from serin2? Then in the background i should have RB0 interrupt the code and run the PWM sequence?

Im sorry im not getting it. There must be a few ppl sat at home shouting at their PCs "I cant believe he still doesnt understand!!!" lol. I have a feeling that eventually something will click and suddenly it will all seem really simple

[mackrackit]

"regular" interrupts will see the event happen be it an internal timer or change on a pin. Then it waits until the program is finished doing what ever then goes to the interrupt routine. This is the timing issue spoke of. That is where the clock programs come in for an explanation, there is only so much time between interrupt events.

If the program is in the middle of a serial command and an interrupt flag is set, the interrupt will not run until the serial routine is finished.

Here is a recent thread where an interrupt is being worked out.
http://www.picbasic.co.uk/forum/showthread.php?t=7490

[mister_e]

When dealing with interrupts and critical stuff... you don't want to use anything else than a REAL USART. Select a PIC with a EUSART/USART, use it and forget SERIN/SERIN2/DEBUG.