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There is no such thing as a PWM interrupt. But the PWM is generated by Timer2, and there is a TMR2 interrupt.

So, how are you going to proceed?

If the protocol can't be changed, too bad, but this is the method I've used, and it seems to work:

Start every packet with a "start character". In principle this can be any value, though ...

Check out Roman Black's "Blacknet" system:
http://www.romanblack.com/blacknet/blacknet.htm

Wondering what instructions these are?.

I meant the branch and pointer-oriented instructions, "C Compiler Optimized" as the datasheet says.
https://dl.dropboxusercontent.com/u/28291527 ...

With these enhanced midrange devices, if CCS "supports" them does that mean that the compiler will use the extra assembly instructions that these parts have? I'd have thought that it would t ...

One thing you have to consider is what the direction of data flow is. Do the units typically send data to each other arbitrarily, or is there a "master", which may be a computer or connected ...

Note that if you use a 40-pin chip where a 20-pin one (or smaller!) would work, you're wasting circuit board space, and you will pay for that, and so will your customers if it's a commercial product. ...

I think with your fast processor, the scheme I proposed is workable. In fact you could do it by "brute force" with an interrupt at every potential transition on the PWM output, i.e. every 5u ...

It may be easy to run 4 (or any number) of PWM's on one timer, or it may not. What makes the difference is how much resolution you need in the outgoing pulse, and I don't believe you've told us that. ...

Boy, everyone's got something to say, haven't they.

My contribution is that I don't like the sound of "a button connected between 5v and RB0". What is the normal state of RB0? I don't see ...

You need to have the master do something that uniquely identifies itself, and program the slaves so this action is the only thing that they'll use to reset their clocks.

One possibility would be to ...

What a truly atrocious interface! They have a limited grasp of spelling, too.

You will have to bet that your clock matches the unit's clock fairly exactly, and look for a pulse each from the un-bl ...

I assume this is part of an infrared light communication system as with TV remote controls.

Repeating Ttelmah's work on the topic:

You have 1.6W power dissipation while the current is flowing. B ...

Yes, you could mix up the hardware and software UARTs, if they run at the same baud rate. The real killer with software UARTs though, is that it's almost impossible to make them run in full-duplex mod ...

Now that you point the memory issue out, I'm realizing that my projects are typically small ones. That must be true if I haven't outgrown the PIC16 series!

As for USB, if I'm able to get that feat ...