System to service processor interface for a tablet computer
US5329625A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1992 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Apr 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03547
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.