Microcomputer and microprocessor having flash memory operable fr

Details Microcomputer and microprocessor having flash memory operable fr Microcomputer and microprocessor having flash memory operable fr

1999-09-17

2000-11-28

Nelms, David

Static information storage and retrieval

Powering

36518906, 36518909, G11C 700

Patent

active

061544124

ABSTRACT:
A microcomputer incorporating a flash memory which is erased and programmed electrically in a stable manner within a relatively wide range of external power supply voltages including those for low-voltage operations The microcomputer comprises a voltage clamp unit including a reference voltage generating circuit and a constant voltage generating circuit. In operation, the voltage clamp unit generates a voltage of a low dependency on a supply voltage and clamps the generated voltage to a voltage level which, within a tolerable range, is lower than a single supply voltage externally furnished This prevents voltages boosted by boosting circuits operating on the clamped voltage, i.e., programming and erasure voltages, from being dependent on the externally supplied voltage.

REFERENCES:
patent: 4229667 (1980-10-01), Heimbigner et al.
patent: 5444664 (1995-08-01), Kuroda et al.
patent: 5537073 (1996-07-01), Arimoto
patent: 5991221 (1999-11-01), Ishikawa et al.

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