| 摘要 |
PURPOSE:To save the number of timers by inputting a signal of a prescribed period to a CPU as an interruption request and giving it to a device requiring a drive signal with a prescribed period. CONSTITUTION:A prescribed numeral is written in a counter 22 and a read latch 23 from a CPU a via a gate 21, counted down/up by using a pulse 200 to form the overflow. In this case, a signal is outputted to a F/F 25 and a F/F 3 from the counter 22. In inputting an interruption request signal from a Q output of the F/F 25 to the CPU and a drive signal is fed to a buzzer from the inverse of Q output of the F/F 3. In receiving an interruption request signal generated from the F/F 25 by the CPU 1, the CPU 1 resets the F/F 25 via a gate 26. |
