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Topic: 1hz clock (Read 4 times) previous topic - next topic

Mori

an ATtiny and an external 8 or 16 Mhz crystal could do it (Set it up to pulse every second)
Memento Mori
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baum

I am going to end this topic and start a new, more specific one. Thanks for all the help!

CrossRoads

Yes,
Feed 64 KHz into CCLK, RCO from stage 1 into stage 2, RCO Pulse from will yield a low going pulse 1/64K wide 1x a second.

http://www.eetkorea.com/ARTICLES/2001SEP/2001SEP06_AMD_AN.PDF
See figure 3 for suggestion on getting 64KHz source. Other ways also possible, this seems pretty straight forward.
http://www.z80.info/uexosc.htm
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

baum

#18
May 25, 2011, 11:42 pm Last Edit: May 25, 2011, 11:45 pm by baum Reason: 1
Quote
seems pretty straight forward.


Not as easy as I would have hoped, but I guess it will be fine. For the first link, they don't specify where the output is...any ideas?

Also, is there a way I can get 50% duty cycle?

CrossRoads

Enable the outputs, and use the MSB, which will change hi/lo/hi/lo every 1/2 second.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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