Attribute Parameter Value Product Category Microcontroller (MCU/MPU/SOC) CPU Core ARM Cortex-M0+ Max CPU Frequency 80MHz CPU Bit Width 32 Bit Program Storage Capacity 64KB Program Memory Type FLASH RAM Capacity 9KB EEPROM Capacity - Attribute Parameter Value I/O Count 27 ADC (Bit Width) 12bit DAC (Bit Width) - Oscillator Type Internal + External Operating Voltage 1.71V~3.6V Operating Temperature -40℃~+105℃ Functional Features Window Watchdog (WWDG); Independent Watchdog (IWDG); Brown-out Reset (BOR/LVD/LVR/LVI); Calendar Function; Power-On Reset (POR); Built-in General-Purpose Timers; Hardware CRC; Infrared Remote Control; Integrated LDO