Single chip microprocessor with on-chip modifiable memory

Details Single chip microprocessor with on-chip modifiable memory Single chip microprocessor with on-chip modifiable memory

1980-11-17

1983-05-03

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 900

Patent

active

043822797

ABSTRACT:
A microprocessor architecture which permits automatic programming of a non-volatile memory included on the same chip as a processing and control unit. The microprocessor includes a permanent memory such as an EPROM which can be electrically written word by word. The microprocessor additionally includes a processing and control unit connected to the permanent memory through two sets of data and address registers. Circuits are also included for distributing memory write voltage in a manner which does not interfere with normal operation of the microprocessor. As a result, the data contents at one memory location can be modified (written) the same time instructions are being read from another memory location. Memory writing can alternatively be effected by a sub-program comprising a sequence of microinstructions, or by a write automaton comprising hard-wired logic circuits.

REFERENCES:
patent: 3792441 (1974-02-01), Wymore et al.
patent: 4128873 (1978-12-01), Lamiaux
patent: 4153933 (1979-05-01), Blume, Jr. et al.
Osborne, A. et al., "An Introduction to Microcomputers", vol. II, Jun. 1977, pp. 1-1 to 1-21.

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