Epm having an improvement in accounting update security

Details Epm having an improvement in accounting update security Epm having an improvement in accounting update security

G - Physics

06

F

354/230, 354/241

G06F 9/445 (2006.01) G06F 11/14 (2006.01) G07B 17/00 (2006.01)

Patent

CA 2003374

An electronic postage meter has two non-volatile memories for storing postage meter accounting data under control of a CPU operating under a program in ROM. An accounting data recovery routine is stored in ROM. Prior to updating critical information in the non-volatile memories, a recovery address which calls the recovery program is stored in NVM and cleared after a successful update. At each power-up of the meter, the non-volatile memory is checked to see if the address is present and if it is, the accounting data is done again from the start of the accounting cycle.

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