| 摘要 |
<p>PURPOSE:To prevent a malfunction by generating an interruption signal of the central processing unit (CPU) by a detection signal from the electric power source variation circuit, and without delay informing an abnormal and recovery of the electric power source to the CPU. CONSTITUTION:An output signal 2 of the detection circuit 1 is input to the phase variation detection circuit 3. This phase variation detection circuit 3 detects a variation of the potential of the output signal 2, generates an interruption signal 4, and informs an abnormal of the electric power source to CPU5. When the electric power source has been recovered to its normal state, the potential of the output signal from the detection circuit 1 is varied opposite to its abnormal time, and the phase variation detection circuit 3 generates an interruption signal 4 and informs that the electric power source has been recovered to CPU5. In this regard, each circuit is backed up by the auxiliary electric power source 6.</p> |
