🚀 go-pugleaf

"Darrin" <darrin_2000au@yahoo.com> wrote in message news:<409b5562$1@dnews.tpgi.com.au>...
> To those in the know:
> I am after designing a Real-Time Clock circuit with 8 Data output lines,
> such that at a specific time of the day it should output a set pattern of
> data on its output, hold this data at the outputs for exactly 3 hours, then
> revert to default (defined) for the rest of the day. Further, this change
> should only happen during weekdays and not weekends or public holidays. I am
> hoping to achieve this by using a RTC chip.  I am presently looking at a
> chip which I believe may be able to do this (RTC-62421). Has anyone used
> this chip before or have any information like datasheet, specs etc...? Any
> ideas or suggestions appreciated - Tks/Darrin

Hi Darrin,
You are best off using a more common RTC like the DS1307 for which
there are plenty of drivers available for various microcontrollers.
You shouldn't have to write your own just to talk to a simple RTC
chip.
A simple RTC with a small 8 bit microcontroller will do exactly what
you want.
If you want it to be standalone then you'll need some sort of display
like an LCD to set the time/date and alarm times etc. Or else hook it
up to your PC via serial port and do it that way. The EEPROM in the
micro can be used to store the alarm times and other data, and a
battery will keep your RTC going, so the entire design will be
tolerant of power loss.

Regards
Dave :)