Nonvolatile memory protection arrangement for electronic...

Details Nonvolatile memory protection arrangement for electronic... Nonvolatile memory protection arrangement for electronic...

G - Physics

07

B

354/241, 354/34,

G07B 17/02 (2006.01) G06F 11/00 (2006.01) G06F 11/14 (2006.01) G07B 17/00 (2006.01)

Patent

CA 1267237

NONVOLATILE MEMORY PROTECTION ARRANGEMENT FOR ELECTRONIC POSTAGE METER HAVING PLURAL NONVOLATILE MEMORIES Abstract of the Disclosure A system for the nonvolatile storage of data, such as a postage meter system, includes a microcomputer coupled to an MNOS type nonvolatile memory and also coupled to an EEPROM type nonvolatile memory, each memory having address lines and data lines. The address lines and data lines of the two nonvolatile memories are coupled to microcomputer ports such that the MNOS memory data lines are always at a high value whenever the EEPROM memory is addressed for the purpose of either writing or reading. The EEPROM nonvolatile memory control terminals and the MNOS nonvolatile memory control terminals are coupled to different ports of the microcomputer. Access to the MNOS nonvolatile memory is achieved by input/output mapping techniques. Access to the EEPROM nonvolatilememory is achieved by memory mapping techniques. In this way, protection is provided against inadvertently accessing the wrong memory or wrong address while executing read/write instructions to a selected memory.

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