| 摘要 |
PURPOSE:To designate lots of functions with a few keys by starting a timer circuit outputting a timer signal with a prescribed pulse width when a start switch signal is outputted to count the number of start switch signals. CONSTITUTION:Upon the detection of a start switch 1 by the switch ON/OFF recognition circuit 4 of an automobile telephone controller 10, the circuit 4 applies a start switching signal 4 to a timer circuit 5 and a counter circuit 6. The timer circuit 5 detects the rise of the start switching signal (a) to output a timer signal (b) with a prescribed pulse width. A counter circuit 6 counts the number of the switching pulse signals (a) at the fall of the start switching signal (a) while the timer signal (b) representing the ON state is received. A counted value deciding circuit 7 applies a counted value signal (d) to an automobile telephone radio equipment control circuit 8. Thus, the number of designated functions is remarkably increased without increasing the number of switches such as function keys. |
