Cap Sense ...getting a drowsy PIC to wake out of sleep!!

[Demon]

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5. Any external interrupt

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(that's my bold too - is a Timer interrupt deemed an 'external interrupt'?)
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I'm just reading up on this now too, using the PIC 16F877 as example, check pin RB0/INT.

3.2 PORTB and the TRISB Register
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RB0/INT is an external interrupt input pin and is configured using the INTEDG bit (OPTION_REG<6>).
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p. 33/218

I wished I had more, like a code example, but it's all I found so far (quickie search).

(just one more feature on my list of things to play with)

[Demon]

A very well-written tutorial:

http://www.hobbyprojects.com/pic_tut...utorial11.html

...The PIC has 4 sources of interrupt. They can be split into two groups. Two are sources of interrupts that can be applied externally to the PIC, while the other two are internal processes. We are going to explain the two external ones here.
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And a step-by-step tutorial with code examples from Nuts & Volts:

http://www.precision.net.in/picbasic/PIC_INT.PDF