Programming interface for a universal asynchronous receiver/transmitter
US5822548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/105
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A universal asynchronous receiver/transmitter (UART) computer programming interface emulates three-wire interface control. A register select circuit is supplied with address signals from a host CPU and has a plurality of register outputs organized into first and second groups. One of these groups of outputs are those which are required for three-wire operation in communications devices; and these outputs are mapped to the appropriate communications devices or registers. The other group of outputs required for three-wire operation, but with no corresponding function in a communications device, are implemented by means of an UART emulator circuit producing a data output which is coupled to an internal data bus, along with the output of the registers for the communications devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.