Circuit arrangement for inputting control signals into a microcomputer system
US4488220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1982 |
| Grant date | Dec 11, 1984 |
| Priority date | — |
| Expiry date | Mar 19, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/32
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
With this circuit arrangement a plurality of control commands can be inputted into a microcomputer system by means of only a single input channel and the microprocessor is relieved of the operation of scanning the peripherals for detecting the presence of control commands. By means of a release or enabling signal the microprocessor signals its preparedness for receiving interruptions, and the release or enabling signal activates a scanning and comparator unit arranged between an interrupt requirement input of the microprocessor and a peripheral unit. Thereafter the scanning and comparator unit scans control command transmitters grouped together in the peripheral unit and characterized by an address and compares the switching state thereof with a switching state which is stored under the same address. If the two switching states are different, there is generated an interrupt requirement or requisition and the stored switching state is adapted to the switching state of the control command transmitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.