Thanks for the fast response, Steve. Funny, I'm using a 12F675, but did think it was an overkill and a 10FXXX would be a fine fit.

Also thought the @ SLEEP would be the answer, but I have to admit interrupts (specially the ADC triggerred ones), are not my Forte. Could you possibly point me in the right direction?

Actually, the supply is 3.3, and the PIC merely needs to pull down an external pin thats held high (also at 3.3) with a very weak pull-up.

For those interested, this is a wired remote for DSLRs that uses a smartphone as a triggering device with s/w thats available free (for Androids for sure, dont know about other platforms)

Regards,

Anand Dhuru