In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Bongo wrote:

Greetings Kramar

 

Real time clocks need very accurate xtals, as a very small error results in big changes.  Based on a 4mHz xtal that is good for driving a micro, can easily result in time gain/losses of 10 minutes per day.

The 32.768kHz watch xtal is the one to use, if you do not want to adjust your "clock" every day.  This introduces some limitations.

The more flexible approach is to use the Dallas time/date chip.  Drive this with the 32.768kHZ xtal and then use whatever speed you want on the SX.

Many years ago I saw very good information in the app notes for the basic stamp.  Suggest you have a look.

Greetings from queensland.

bongo

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