System to service processor interface for a tablet computer
First Claim
1. A digitizer tablet computer comprising:
- a pen actuated digitizer for generating digitizer data indicative of pen position;
a digitizer controller connected to said digitizer for converting said digitizer data into digital coordinate data indicative of pen position;
a display for visually indicating representations of pen position;
a host processor connected to said display for controlling operation thereof;
a service processor connected to said host processor through an interface comprising an input buffer, an output buffer, and a controller status register (CSR);
first means connecting said service processor to said digitizer controller for receiving and buffering said coordinate data and transmitting such coordinate data to said service processor for processing;
second means in said service processor for transforming said coordinate data into processed data;
and third means for transmitting said processed data from said service processor to said host system through said interface.
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Accused Products
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.
134 Citations
14 Claims
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1. A digitizer tablet computer comprising:
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a pen actuated digitizer for generating digitizer data indicative of pen position; a digitizer controller connected to said digitizer for converting said digitizer data into digital coordinate data indicative of pen position; a display for visually indicating representations of pen position; a host processor connected to said display for controlling operation thereof; a service processor connected to said host processor through an interface comprising an input buffer, an output buffer, and a controller status register (CSR); first means connecting said service processor to said digitizer controller for receiving and buffering said coordinate data and transmitting such coordinate data to said service processor for processing; second means in said service processor for transforming said coordinate data into processed data; and third means for transmitting said processed data from said service processor to said host system through said interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification