----- Original Message -----
From: "Gabriel Caffese" <gabrielsdi@IMPSAT1.COM.AR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 20, 2002 11:43 PM
Subject: Re: [PIC]: Turning on a PIC micro every 5 minutes.....


> Thanks Bob,
>
>         But I forgot to say, that the system will use 2 button cell
(lithium)
> batteries in parallel,
> so Vdd is 6volt, and will use a 4mhz Xtal, cause it has to download data
> every 1 month.

Is the chip even specced to run at Vdd = 6V ??

You could still run with an RC OSC, but then use the 32.768KHz crystal to
'calibrate' a timebase for a bit-banged software UART (or, if your baud rate
is low enough, you could even compute an appropriate value to store in the
BRGEN and use the hardware UART).

>         Another thing, is that I have never been able to get a lower
consumption
> that 0.08 ma @5v,
> in sleep mode !!!
>         So, what can I do ?

This may be because of drain thru an I/O pin. There are two possibilities:
(1) a floating input causes drain in the input stage. (2) an output driving
high into some load.

Also, it might be some other part of your circuit.

Bob Ammerman
RAm Systems

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