Description: CPU kernel: ARM Cortex-M0 CPU maximum main frequency: 50 MHz operating voltage range: 2.5V~5.5V internal oscillator: with external clock frequency range: 4 MHz ~ 24 MHz program FLASH capacity: 64KB RAM total capacity: 4KB EEPROM / data FLASH capacity: 4KB GPIO port number: 40 ADC (number of cells / channel number / number of digits): 1