Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1996-05-10
1999-03-30
Bragdon, Reginald G.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711163, 36518501, 36518518, 36518527, G06F 1216, G11C 1604
Patent
active
058901914
ABSTRACT:
Method and apparatus for providing erasing and programming protection of an EEPROM (22) to significantly reduce the possibility of unintentional erasing or programming of the EEPROM (22). In one embodiment, a read access of a block protect value (111) is a requirement for enabling the EEPROM charge pump (78). The block protect value (111) may be located in the EEPROM array (22) itself. In one embodiment, an externally provided signal (24) must be provided to an integrated circuit (10) in order to enable a write access to modify the block protect value (111). In one embodiment, a charge pump enable value (103) is provided to enable or disable operation of the charge pump (78). Thus, a combination of hardware and software protection is provided for an EEPROM (22), including protection for enabling of a charge pump (78).
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Catherwood Michael I.
Espinor George L.
Bragdon Reginald G.
Hill Susan C.
Larson J. Gustav
Motorola Inc.
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