Description: CPU kernel: ARM Cortex-M3 CPU Max Main frequency: 72 MHz Operating voltage Range: 2V~3.6V internal oscillator: program FLASH capacity: 512K@x8bit RAM Total capacity: 64KB GPIO Port number: 112 ADC (number of cells / channels / number of digits): 1@x21ch / 12bit DAC (cells / channels / digits): 1@x2ch / 12bit peripherals / work