| 摘要 |
<p>PURPOSE:To reduce the current consumption of e key input circuit by omitting the need to always produce, a clock signal of high frequency for a high frequency oscillation circuit. CONSTITUTION:Plural AD input keys ere arrayed at an operating part 1. A key input detecting part 5 is connected between the pert 1 end an interruption port INT of a control part 2. The part 2 monitors whether the detection signal showing that the input is received vie an AD input key of the part 1 is supplied or not to the port INT from the part 5 based on the clock signal of comparatively low frequency generated by a low frequency oscillation circuit. When detection signal is supplied to the port INT, the part 2 actuates a high frequency circuit 4 and decides 8 specific AD key operated based on the clock signal of comparatively high frequency.</p> |
