| 摘要 |
<p>PURPOSE:To easily confirm the operation of a high voltage generation circuit from outside by providing a high voltage detection circuit detecting the output state of the high voltage generation circuit and outputting a detected result to the external terminals. CONSTITUTION:A mode setting circuit generates a control signal operating the high voltage generation circuit 2 by the state of the external terminal 10. When the high voltage generation circuit 2 normally operates and it generates a high voltage, the high voltage detection circuit 9 detects it and outputs an H-level. At that time, a selector 8 selects the output of the high voltage detection circuit 9 by the control signal outputted from the mode setting circuit, and outputs the H-level to the external terminal 11 through an output buffer 6. When the high voltage is not generated, an L-level is outputted to the external terminal 11 since the output of the high voltage detection circuit 9 is 'L'. Thus, it can be confirmed from outside whether the high voltage generation circuit 2 normally operates or not.</p> |
