Keyboard circuit

Details Keyboard circuit Keyboard circuit

G - Physics

08

C

340/176, 354/236

G08C 25/00 (2006.01) H03M 11/00 (2006.01)

Patent

CA 1073554

KEYBOARD CIRCUIT ABSTRACT OF THE DISCLOSURE Disclosed is a simplified keyboard for a terminal device, calculator, or the like, in which each key is sequentially scanned and parallel key code data is sent to an entry register. A pair of flip-flops in combination with firmware ascertain that only valid key code data is sent to the entry register for uti- lization by the system, providing double entry and key bounce protection. The firmware further provides N-key rollover and auto repeat with a variable repeat rate, and expands the key- board from a single-mode to an eight-mode capability.

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