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atmega32u4 is low-power Atmel 8-bit AVR RISC-based microcontroller

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Does the Arduino pro-micro 3.3v use an 8MHz crystal or a 16MHz crystal with a clock divisor ...

Since the pro-micro exists in a 3.3v variant, I presume there is some way to get the Atmega32u4 chip working at lower voltages. … Since the pro-micro 3.3v is the "mainstream" supported board using the Atmega32u4 at a lower voltage, I would like to configure my project to be compatible. …
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