The reason for the low clock speed is that I MUST get the thingie
to use as low current as ever possible. If I look in the data sheet
it seems like the curent consumption is approx proportional to
the clock rate, hence this low clock freq.
I am trying to replace an EPLD logic circuit with the PIC16C84
and the requirement is that operating current has to be below
500 uA. With the sleep trick I can probably get it down there as
average current because of the low signalling duty cycle.
But I think that 10 MHz clock will raise current too much.
Code packets consist of 4 chars at 1200 baud which effectively
keeps the PIC out of sleep for about 33 ms.


Bo Berglund
PaddelvŠgen 10, S-17545 JŠrfŠlla, Sweden
e-mail: bo.berglund@mailbox.swipnet.se


----------
From:   Bruce Cannon[SMTP:bcannon@CCNET.COM]
Sent:   den 25 maj 1997 07:16
To:     PICLIST@MITVMA.MIT.EDU
Subject:        Re: Wakeup time from sleep on 16C84???

Why not use a faster osc?  10Mhz would both speed startup and reduce the
temp dependent freq variation by a factor of ten, right?

>I want to use my '84 as a code receiver and have it sleep
>between transmissions. Codes are sent at 1200 baud and I use
>a 1MHz resonator as clock source (configured as XT type).
>Is the wakeup time short enough and stable enough to not miss
>the first information bit?