Description: CPU kernel: 51 Series Operating Voltage Range: 2.5V~5.5V Internal oscillator: programmed FLASH Capacity: 61KB RAM Total capacity: 4KB GPIO Port number: 62 ADC (cells / channel / digits): 1@x8ch / 10bit (E) PWM (cells / channel / digits): 1@x6ch / 15bit 16 bit Timer number: 5 Internal comparison