Manufacturer: Atmel  •  Series: 8x251  •  Core Processor: C251  •  Core Size: 8/16-Bit  •  Speed: 24MHz  •  Connectivity: EBI/EMI, I²C, Microwire, SPI, UART/USART  •  Peripherals: POR, PWM, WDT  •  Number of I /O: 32  •  Program Memory Type: ROMless  •  RAM Size: 1K x 8  •  Voltage - Supply (Vcc/Vdd): 4.5 V ~ 5.5 V  •  Oscillator Type: Internal  •  Operating Temperature: 0°C ~ 70°C  •  Package / Case: 44-VQFP