Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1992-04-22
1995-09-12
Swarthout, Brent
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
341 22, H03K 1794
Patent
active
054500800
ABSTRACT:
A keyboard interface controller in the nature of a state machine is placed in a stop mode or an idle mode after initialization. In stop or idle mode, all the keyboard conductors associated with the X-axis are activated, while all keyboard conductors associated with the Y-axis are sensed. Upon being awakened by an interrupt upon key closure from which the Y-axis location of the closed key is determined, the controller sequences through the steps of (a) determining the X-axis of the keyboard by activating the determined Y-axis conductor and sensing the X-axis conductors; (b) converting the crosspoint to a unique code; (c) transmitting the crosspoint code to the host; and (d) checking for either another closure or the release of the closure detected. When all keys are released, the controller returns to stop or idle mode.
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Carroll David H.
Mullen Jr. Thomas J.
Samsung Semiconductor Inc.
Swarthout Brent
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