| 摘要 |
<p>PURPOSE:To guarantee accurate operation of a CPU by using a monostable multivibrator to inhibit an unmasked interruption applied to the CPU for a prescribed time at application power. CONSTITUTION:When power failure is restored by the application of power, an unmasked interruption NMI release signal is generated to actuate a monostable multivibrator 5. Thus, an output terminal O2 of the vibrator 5 goes to a low level for a prescribed time to inhibit the input of the NMI to the CPU1 for a prescribed time. The CPU1 processes power failure restoration such as return of stack pointer and return of register and is restored. Thus, when an RAM backed up by a battery is used for the memory, even if power is applied, the movement of the software is brought into the continuous movement.</p> |
