G - Physics – 11 – C
Patent
G - Physics
11
C
354/34, 354/230.
G11C 7/00 (2006.01) G07B 17/00 (2006.01) G07B 17/04 (2006.01) G11C 16/20 (2006.01) G11C 16/22 (2006.01) G11C 16/30 (2006.01) G11C 16/32 (2006.01)
Patent
CA 1219676
NON-VOLATILE MEMORY PROTECTION CIRCUIT WITH MICROPROCESSOR INTERACTION ABSTRACT OF THE DISCLOSURE The method and associated apparatus for controlling the erasure and writing of data in non-volatile memory during the power up, power down and normal operating cycles of an elec- tronic postage meter, comprising the steps of monitoring an input power signal to provide an output enable signal when the input power signal reaches a first predetermined threshold voltage, transmitting a reset signal to a microprocessor to inhibit the generation of a write signal prior to the input signal reaching the threshold voltage, transmitting a non- volatile erase signal from the microprocessor subsequent to the input power signal reaching the threshold voltage, applying a bias voltage to a terminal of the non-volatile memory to allow the erasure of data therefrom only during a coincidence between the non-volatile memory erase signal and the output enable signal, providing a low voltage warning signal to the microprocessor when the input power signal falls below a speci- fied value, removing the output enable signal when the input power signal falls below a second predetermined threshold voltage, transmitting a non-volatile memory write signal from the micro- processor subsequent to receiving the low voltage warning signal and prior to removal of the output enable signal, applying a bias voltage to a terminal of the non-volatile memory to allow the writing of data therein only during a coincidence between the non-volatile memory write signal and the output enable signal, and providing a reset signal to the microprocessor coincident with the removal of the output enable signal to inhibit the generation of any spurious write or erase signals by the microprocessor.
453057
Eckert Alton B.
Nambudiri Easwaran C.n.
Pitney Bowes Inc.
Sim & Mcburney
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