Description: CPU kernel: ARM Cortex-M0 CPU Maximum primary frequency: 48 MHz Operating Voltage Range: 1.8V~5.5V Internal Oscator: External Clock frequency range: 4 MHz ~ 32 MHz Program FLASH Capacity: 256KB RAM Total capacity: 32KB EEPROM / Data FLASH capacity: -GPIO port number: 40 ADC (Unit / channel number / bit