> like PIC16F610 is the cheapest pic with right number of IOs

The 16F54 is half the price and has 12 I/O also

Most PIC's quiescents are quite similar @ 32kHz, if that's what's
used for timing, whether they're nanowatt or standard

12F675 9uA
16F88 9uA
18F1320 13uA
16F870 20uA

The 16F610 is average at 13uA at comparable Vcc. That's potentially
100,000 hours (11 years) from 1.3Ah AAs, with the PIC fully awake


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist