Method of establishing a clock in the I/O card of a personal computer
US5241647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of establishing a clock for the UART circuit provided in a standard I/O card or a combined graphic and I/O card is disclosed. The essential step of the method of the invention is to directly impress the clock of the main board of a personal computer into the UART circuit of the I/O card thereby eliminating the need for an independent crystal for the UART circuit. In an alternative embodiment of the method according to the present invention, the clock for the graphic data processing circuit provided in a combined graphic and I/O card is impressed directly to the UART circuit provided in the same card. The method of establishing a clock in the I/O card also includes a step of processing the directly impressed clock, either from the main board of the personal computer or from the graphic data processing circuit, to obtain the desired clock for the UART circuit with a desired frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.