发明名称 |
Data protection system for electronic postage meters having multiple non-volatile multiple memories |
摘要 |
A method and associated apparatus is provided for protecting the accounting data stored in an electronic postage meter having multiple non-volatile memories for the storage of accounting data, including the steps of and associated apparatus for providing a first non-volatile memory; writing postage transactions accounting data into the first non-volatile memory in real time during each trip cycle of the meter; providing a second non-volatile memory; writing postage transaction accounting data into the second non-volatile memory only during the power cycle of the meter; and disabling the first non-volatile memory when the meter enters a power down cycle to prevent any further writing of data into the first non-volatile memory. Advantageously, the first non-volatile memory is clamped to ground potential during the power down cycle.
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申请公布号 |
US4706215(A) |
申请公布日期 |
1987.11.10 |
申请号 |
US19840643111 |
申请日期 |
1984.08.22 |
申请人 |
PITNEY BOWES INC. |
发明人 |
KIRSCHNER, WALLACE;NAMBUDIRI, EASWARAN C. N.;PATTERSON, DOUGLAS H. |
分类号 |
G07B17/00;G11C16/06;G11C16/22;(IPC1-7):G06F7/12 |
主分类号 |
G07B17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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