Microcontroller and method of controlling the same

A method of controlling a microcontroller that comprises an oscillator, a data input unit, and a CPU (central processing unit), the method comprising:

• outputting, by the data input unit, a start request signal, when the data input unit receives a first input data;
• starting the oscillator according to the start request signal, to generate a clock signal;
• operating the data input unit to receive a second input data using a first clock signal based on the clock signal;
• and
• supplying a second clock signal based on the clock signal to the CPU after the data input unit normally completes the operation, to perform processing according to the second input data when the CPU is operated,
• wherein the data input unit receives the first input data without receiving the first clock signal.

A microcontroller comprising:

• a data input unit that receives a first input data and outputs a start request signal upon receiving the first input data;
• an oscillator that starts according to the start request signal, to generate a clock signal;
• a clock signal supply control unit that outputs the start request signal supplied from the data input unit to the oscillator, and outputs a first clock signal and a second clock signal based on the clock signal;
• and
• a CPU (central processing unit) that operates with the second clock signal,
• wherein the data input unit receives a second input data using a first clock signal and the clock supply control unit outputs the second clock signal to the CPU after the second input data is received by the data input unit.