>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 31 May 2006 11:34
>To: Microcontroller discussion list - Public.
>Subject: Re: [PIC] operation time counter
>
>
>> > > The total time to be checked is 5 years and the resolution
>> > > has to be 1 minute.
>> >
>> >You simply won't get that accuracy over 5 years with a PIC's
>> >TMR. An external timing source is needed
>> >
>> AFAICT the OP only requires a resolution of 1 minute, not an 
>accuracy 
>> of 1 minute in 5 years
>
>Hi Mike, if that were the case then the "5 years" is 
>irrelevant. You may as well take the reading for the day and 
>start afresh

Joe,
It's only relevant in that it determines the maximum counter size required, i.e. the number of cells in the EEPROM which need to be updated.  5 years is 2630880 minutes which will comfortably fit into 3 bytes which IIRC is the size counter that Bob was using?

Regards

Mike

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