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Supports Three Power Supply Methods: Usb, Vin, External 5V Input The Developer Board Can Be Powered Via The Mini B Usb Port, An Unregulated External 7 12V Power Supply Pin 30 , Or A Regulated External 5V Power Supply Pin 27 . The Highest Voltage Source Is Automatically Selected As The Power Source. Clock Frequency 20Mhz, 48Kb Flash Memory Including 6Kb For Bootloader With Breadboard Function, It Has A Pin Layout That Can Be Compatible With The Mini Usd Ch340G, 5V Board, 16Mhz, Arduino Compatible