Technique for preventing data stored in a memory of telephone sy

Details Technique for preventing data stored in a memory of telephone sy Technique for preventing data stored in a memory of telephone sy

1997-02-12

1999-03-09

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

379413, 379 2, 379 27, 379 32, 455572, 455343, H04M 124, H04M 308, H04M 322

Patent

active

058811281

ABSTRACT:
A circuit for preventing data stored in a memory of a telephone system from being corrupted including: a memory for receiving a plurality of control signals from the processor and for storing received data; a decoder connected to a chip enable terminal of the memory, for receiving a plurality of control signals from the processor and for generating a memory enable signal during a normal operation voltage range of the processor, and for placing the memory in an inactive state by supplying a disabling signal to the chip enable terminal of the memory during an abnormal operation voltage range of the processor; a voltage sensing circuit, connected to a chip enable terminal of the decoder, for generating a high level during the normal operation voltage range of the processor, and for generating a low level during the abnormal operation voltage range of the processor for controlling the decoder; and a battery power source supplier for supplying power to the memory and the decoder.

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