| 摘要 |
<p>PURPOSE:To form a power supply terminal with one pin so as to enlarge the capacity of a memory and reduce the number of wiring, by providing a circuit which reads out the power supply for a writing voltage and converts the power supply into the power supply for a reading voltage. CONSTITUTION:At the time of readout, a reading voltage VCC of a low voltage is applied to a power supply terminal 12 and also to the output terminal OUT of a regulated power supply circuit 13, and then, the reading out operation is performed. On the other hand, at the time of writing, a writing voltage VPP of a high voltage is applied to the power supply terminal 12 and the low voltage VCC is outputted to the output terminal OUT. Therefore, the high voltage VPP is directly supplied to X- and Y-address decoders 2 and 3 and the low voltage VCC is supplied to a peripheral circuit 15, and then, a program control circuit 6 is operated by a program signal P from a control terminal 11. Thus the writing operation is performed.</p> |
