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20PU = 20mhz clock

10PU = 10mhz clock

note that these are the maximum clock speeds. voltage and settings will apply also. I believe most AVR's default to 1mhz until you have set the specified fuse setting.

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Q: What is the difference between Atmel microprocessor Atmega88-20pu vs Atmega88pv-10pu?
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