| 摘要 |
<p>PURPOSE:To prevent the malfunctions due to the noises by resetting a CPU after protecting it in the prescribed frequency when the CPU has abnormality. CONSTITUTION:A CPU normal action pulse is supplied to a pulse cut-off detecting circuit 1 and a CPU abnormality informing pulse is sent to a terminal 102 in case said normal action pulse is not received for a fixed period of time or longer. When an abnormality pulse generating circuit 2 receives the abnormality informing pulse, sends an abnormality detecting pulse having the prescribed fixed time width to a terminal 103. A resetting signal output circuit 3 supplies the CPU abnormality informing pulse via the terminal 102 and at the same time supplies the abnormality detecting pulse via the terminal 103. Then a CPU resetting signal is sent to a terminal 104 when the CPU abnormality pulse is turned on by the prescribed frequency while the abnormality detecting pulse is kept turned on.</p> |
