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Adc Clock Is Freezing My Program!

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This is a strange problem - I have an ADC interrupt that works fine when using Frc, the dedicated ADC oscillator, as long as internal oscillator frequency operates at 2, 4, or 8MHz. Below 2MHz, the program freezes, but only when using Frc. The other ADC clock sources work fine.

 

Anyone have any ideas? Thanks!

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Info is thin on the ground for this one.

 

From what I read, the FRC is not recommended on low device clock rates due to digital switching noise unless the device is put to sleep during conversion.

 

I would have thought this noise would only effect the accuracy and not freeze the device.

 

How do you read note 4 in the data sheet ?

 

Cheers

 

Reynard

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