Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

1985-08-21

1987-10-20

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Having particular data buffer or latch

365230, G11C 700

Patent

active

047018860

ABSTRACT:
In a one-chip microcomputer, a EPROM is formed together with a ROM and RAM on one semiconductor substrate. Data such as fixed data necessary in the microcomputer can be changed by the use of the EPROM. In case data are to be written in the EPROM, a EPROM writer is used. This EPROM writer outputs write data to the EPROM and checks (or verifies) the data written in the EPROM immediately thereafter. If any error is detected, the subsequent data write is interrupted. In order to inhibit the unnecessary operation interruption in case the address designated by the EPROM writer comes out of the range of the EPROM, the checking (or verifying) data signal to be fed from the one-chip microcomputer to the EPROM writer is forcibly set at a level which indicates satisfactory operation of the EPROM.

REFERENCES:
patent: 4208728 (1980-06-01), Blahut et al.
Japanese Laid-Open Patent No. 152933/1979, Dec. 1, 1979.

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