Description: CPU kernel: ARM Cortex-M3 CPU maximum primary frequency: 72 MHz operating voltage range: 2V~3.6V internal oscillator: program FLASH capacity: 64K@x8bit RAM Total capacity: 20KB GPIO Port number: 26 ADC (cells / channel / digits): 1@x10ch / 12bit peripheral / function / protocol stack: temperature sensor; DMA; watchdog; P