Method and interface circuit for scanning keys and external resi

Details Method and interface circuit for scanning keys and external resi Method and interface circuit for scanning keys and external resi

1997-10-31

2000-02-01

Horabik, Michael

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 22, 34082579, H03M 1100

Patent

active

060208333

ABSTRACT:
A method and an interface circuit for scanning keys and external resistors of a keypad are disclosed. The interface circuit includes: (a) an I/O device including m output ports and n input ports for allowing a key to be set between every two ports of the I/O device to construct a key disposition and allowing external resistors to be set between each of the output ports and each of the input ports to construct an external resistor disposition; (b) a clock generator providing a clock for the I/O device for having each external resistor in the external resistor disposition and each key in the key disposition scanned in response to the clock; (c) an external resistor detector latching a first scanning result of the each external resistor and outputting a first detecting signal in response to the first scanning result for changing a preset function of a system; and (d) a key input detector latching a second scanning result of each key and outputting a second detecting signal in response to the second scanning result to identify a key of the keypad.

REFERENCES:
patent: 4231024 (1980-10-01), Munetsugu
patent: 4408184 (1983-10-01), Ishii
patent: 4583092 (1986-04-01), Saito
patent: 4906993 (1990-03-01), Freeman
patent: 5381142 (1995-01-01), Simmons
patent: 5430443 (1995-07-01), Mitchell
patent: 5448236 (1995-09-01), Shiga
patent: 5450080 (1995-09-01), Irwin
patent: 5621402 (1997-04-01), Spak
patent: 5719597 (1998-02-01), Fong

Affiliated with

Also associated with

Rating

Method and interface circuit for scanning keys and external resi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and interface circuit for scanning keys and external resi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and interface circuit for scanning keys and external resi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-941129