Description: CPU kernel: ARM Cortex-M4 CPU Maximum primary frequency: 180 MHz Operating voltage range: 1.7V~3.6V internal oscillator: program FLASH capacity: 512K@x8bit RAM Total capacity: 128KB GPIO port number: 114 ADC (unit / channel / digits): 1@x24ch / 12bit DAC (unit / channel / digits): 1@x2ch / 12bit