摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that, in case of taking an interface between an internal circuit, which uses a low voltage by generating the low voltage based on a high power supply voltage, and an external circuit which uses a high voltage, the operation of the internal circuit is sometimes required to be paused while the external circuit is being operated, and under this condition, such circuit (POC circuit) as transmits the fact, that occurrence of low voltage has been paused, to the circuit of interface is required, however, a conventional circuit is required to use a circuit, in which a through current flows under such condition as the low voltage is generated, resulting in increase in power consumption. <P>SOLUTION: The operation of a regulator 107 is stopped by a signal for stopping generation of a low voltage, and under such condition as VOUT is fully dropped, a supply stop signal to the circuit of interface is transmitted to a level shift circuit 121. Thus, occurrence of a through current at the level shift circuit 121 is suppressed. Further, a through current can be prevented under a normal condition in a POC circuit 41 that provides the supply stop signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |