Description: PU kernel: ARM Cortex-M4 CPU Max Main frequency: 120 MHz Operating voltage range: 2.6V~3.6V Internal oscillator: with external clock frequency range: 4 MHz ~ 32 MHz Program FLASH capacity: 256KB RAM Total capacity: 64KB EEPROM / Data FLASH capacity: 256KB GPIO Port number: 51 ADC (cells / channel number / bit