It'll work fine with a 32.768Khz Tuning fork crystal. Put a variable cap on
the hot leg of the OSC so that you can" tweak" its value so that it keeps
time pretty well. If you use a CR2032 I'd guess about a month minimum. But
if you can CHARGE the battery sometimes (like a Vanadium Lithium type),
sized the same then you can have no worries, and it will run..er.. like a
clock...<g>

--B ob

At 06:50 PM 7/11/2003 -0300, you wrote:
>Hi!
>     Hello again all!! I need to make a system that must have a Real Time
>Clock. I just don't want to add 2~3 dolars to my product by adding the
>DS1307, wich is very good, but also expensive here in Argentina. So, I'm
>considering on using a PIC16F628 to perform the requiered tasks and,
>also, mantain the actual time. So I would like to know you  opinions on
>this, I I will use a standard CR2032 3V battery to mantein the time when
>no power is pressent. Do you think that this could work? For how long if
>I only try to mantain the time ?
>
>
>     Thanks!
>
>Mauricio Jancic
>Janso Desarrollos
>(54) 11 4542 3519
>Republica Argentina
>Microchip Consultant Program Member
>
>
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