| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a portable terminal reducing power consumption by detecting the operation of a keyboard to start a clock oscillator. SOLUTION: This portable terminal is provided with a CPU 1, the clock oscillator 5 and the operation keyboard 3 and communicates in a time division system. In this case, a key input detecting circuit 2 detecting the operation of the keyboard 3 and an interruption controller 4 are provided. When the portable terminal comes into a intermittently receiving state, the CPU 1 outputs a stoppage signal to stop a clock oscillating part 5 to enter a sleeping mode and when the keyboard 3 is operated, the circuit 2 detects it to send data to the CPU 1 and outputs a signal to an interruption controller 4. Then the controller 4 starts the part 5 and after the output becomes stable, the controller 4 supplies a clock to the CPU 1 and sends the signal to the CPU 1 to switch the sleeping mode to a normal mode.</p> |
