Semiconductor device and electronic equipment having a non-volat

Details Semiconductor device and electronic equipment having a non-volat Semiconductor device and electronic equipment having a non-volat

1998-02-24

2000-07-11

Elms, Richard T.

Static information storage and retrieval

Floating gate

Data security

365195, 365196, G11C 1604

Patent

active

06088262&

ABSTRACT:
A semiconductor device which can be re-used even if the read protection is set for a non-volatile memory included therein, and electronic equipment including such a semiconductor device. The data written in a memory cell array is protected from being read out from the outside for security. Only when erase of all data in the memory cell array is detected, the read protection is released. Thus, a microcomputer can be refused. The detection with respect to whether or not all data has been erased can be accomplished through execution of a flash erase operation or by reading out all address data. A read protection control circuit includes an EEPROM for storing information that the read protection is enabled. A plurality of such EEPROM's are used. If the read protection for the memory cell array is enabled, the erase/write to the EEPROM's are inhibited. The memory cell array is controlled separately from the EEPROM's. In the normal operation mode, the read-out of data by CPU is permitted. Such a configuration may be applied to a semiconductor device including a gate array block.

REFERENCES:
patent: 5818771 (1998-10-01), Yasu et al.
patent: 5881002 (1999-03-01), Hamakawa
patent: 5892711 (1999-04-01), Park
patent: 5917750 (1999-06-01), Miyakawa et al.

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