Buffering digitizer data in a first-in first-out memory
US5455907A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1993 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Sep 10, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04883
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computer system with a digitizer based screen display in which the digitizer data is buffered through a first-in first-out memory (FIFO). The processor is only interrupted when a full digitizer data packet is available in the FIFO, rather than being interrupted on each data byte available in the FIFO. The FIFO can hold multiple digitizer data packets, so that data is not lost should the processor in the computer system be unable to immediately handle these digitizer data packets. The system also provides a filter in a separate controller that examines each digitizer data packet to determine if the pen is in a predefined screen location that performs a prespecified function. If so, rather than pass the digitizer data packet to the system processor through the FIFO, the command is passed through a separate register to the processor based on the "hotspot" touched on the screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.