PURPOSE: To attain power on reset without fail even when a power supply condition or the like is different by outputting a signal, which is reset by the output signal of a periodic time longer than the periodic time of the load signal of a counter, from its own counter.
CONSTITUTION: The period of a reset time is made longer than the periodic time of a counter load signal 2 so as not to reset the operation of a counter circuit 5 in the middle. When a counter signal 6 is changed from an H level to an L level and reset by a reset signal 3, a normal operation is started by finishing the reset of a power on reset requiring circuit 4 after the lapse of the reset time even when the initial state of the signal 6 is at the H level or the L level. In the normal operation state of the circuit 4, the circuit 5 is loaded periodically by the signal 2 and since the period of the signal 6 is longer than that of the signal 2, the circuit 5 is set at the L level at all times. Therefore, even when the power supply condition or the like is different, power on reset is attained without fail.
KONOHI HAJIME
KIKUCHI KAZUYA
