Method of controlling a semiconductor integrated circuit
US5109359A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 27, 1990 |
| Grant date | Apr 28, 1992 |
| Priority date | — |
| Expiry date | Feb 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0684
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a one-chip microcomputer, an electrically programmable read only memory (EPROM) is formed together with a read only memory (ROM) and random access memory (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, an 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.