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

With an accurate chip clock source (e.g. TTL oscillator) the SX should be fine for regular time-keeping IF you don't mind resetting the time when the power goes off. Otherwise, an external RTC like a DS1302 or DS1307 will preserve the time in a power outage.

There are formulas for calculating day of the week, etc., as well from the time and date, so these functions can be handled w/o an external RTC as well.

e.g. Dr. Allen's code here: [url]http://forums.parallax.com/forums/default.aspx?f=15&m=413898[/url]

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