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Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc.

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Old 12th November 2007, 10:13 AM   (permalink)
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Quote:
Originally Posted by Dawny

Ok my question is this… the circuit I want to build calls on a 13MHz Crystal the PIC in the circuit is a 16F870, which according to it’s datasheet can run up to 20MHz (correct me if you know I’m wrong) Anyway I was just wondering seeing I can’t find a 13MHz Crystal but I can find a 10 or 20MHz ...

Thank you in advance…

Dawn.
Ok... if not able to get 13 MHz then use 12 MHz..

no problem... as too much accuracy is not required in your project ... it seems...

Ok,

it will work well with 12 MHz also...

I feel ... try... then only you'll learn....

Regards,

Simran..
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Old 14th November 2007, 01:58 PM   (permalink)
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Thank you one and all for your input on this topic, you've given me a lot to think about

Dawn.
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Old 14th November 2007, 06:25 PM   (permalink)
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Quote:
Originally Posted by simrantogether
Ok... if not able to get 13 MHz then use 12 MHz..
no problem... as too much accuracy is not required in your project ... it seems...
it will work well with 12 MHz also...
Huh? If she uses a 12Mhz crystal, without changing the code to compensate, the frequency counter will be out by 8% or so. ie a 100Mhz frequency will read as 108.33Mhz!
A quote from the author's page:
Quote:
The accuracy of this counter is set by the frequency of the 13MHz crystal. I advice you to choose a good and stable crystal. In my case I use a very stable and accurate SMD 13.000MHz crystal. The crystal frequency can be fine tuned by a variable capacitor C11 to obtain very high accuracy.
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