PICAXE Chips - PICAXE PICAXE-28X1, PICAXE chip, PICAXE family, 4V to 5.5V supply voltage, 128Bytes flash memory, 22 I/O pins, 4 ADC channels, 2 PWM channels, 16MHz clock speed, I2C interfaces, 28-DIP case, advanced level PICAXE chip, program memory 600 line, separate data memory, interrupts, infra-red receive, support SOR digital temperature sensor, control of radio-control servos, keyboard input, I2C interface for linking to external EEPROMs and other devices, 8/10-Bit ADC, 12-Bit temperature read, PWM motor control, input pulse counting, serial output via programming cable, higher baud rate for serial work. PICAXE-28x1 Chip