Thanks to everyone who responded to my inquire on PIC's lowest power
scheme and the best timed method to wake PIC up from sleep mode. Advices
were really exellent. I am going to try recalibrating of watchdog timer
before powering PIC down. It will save some real estate (external timer
or RTC) and hopefully some current. By the way, databook drawing for
PIC16C63 shows that maximum current with WDT enabled is about 10uA (in
0-70C and 5V). Is it really so? Is it applicable to other PICs (like
16C556 I am going to use)?
I have few other questions:
1. What is the difference between PIC16Cxxx and PIC16LCxxx?
2. Pins configuration in power down mode.
My thought:
- configure all pins as inputs (all peripherals are powered down
also,     so pins are floating);
- turn on internal pull-up on port B;
- pull pins on other ports down with 100K resistors.
Is it correct? Anything else to do for cutting current down?

Again thank you all for help.

Gennady Palitsky
Jefferson Audio Video Systems
gennadyp@mainlink.net