Patent ID: 7761727

Claim:
A micro-controller controlling data transfer to or from an external device, the micro-controller comprising: an oscillating circuit generating an oscillating signal in response to a logic level of an oscillating control signal; a transfer control unit receiving data through a data line, transferring data to an external device through the data line, and outputting a first signal, the transfer control unit being operated in response to the oscillating signal and receiving a first power supply voltage; a main control unit controlling the micro-controller, and outputting a second signal, the main control unit being operated in response to the oscillating signal and receiving a second power supply voltage lower than the first power supply voltage; and an oscillating control circuit outputting the oscillating control signal, a logic level of the oscillating control signal being determined by logic levels of the first signal and the second signal, the first signal and the second signal being asynchronous to each other.