Description: CPU kernel: 51 Series CPU Maximum primary frequency: 40 MHz Operating voltage range: 2.4V~5.5V Internal oscillator: -External clock Frequency range: -Program FLASH Capacity: 8KB RAM Total Capacity: 256Byte EEPROM / Data FLASH Capacity: -GPIO port number: -ADC (number of cells / number of channels / number of digits): -DAC (unit