Title:
キーパッド装置
Document Type and Number:
Japanese Patent JP4027285
Kind Code:
B2
Abstract:
A keypad device including a parallel/serial conversion device, a keypad module, and a controller coupled to the parallel/serial conversion device and the keypad module. The keys in the keypad module are arranged in parallel. After the key is triggered, an interrupt signal will be fed to the controller. On receiving the interrupt signal, the controller will feed a drive voltage to the keypad module generating a parallel signal therein. After causing the parallel/serial conversion device to read and store the parallel signal, the controller will be able to read the parallel signal serially by using the clock signals. The status of the keypad module can thereby be obtained.
Inventors:
Yu-Chun Pen
Xiao-Chun Ho
Sai-Chen Yi
Qi-Minju
Xiao-Chun Ho
Sai-Chen Yi
Qi-Minju
Application Number:
JP2003284260A
Publication Date:
December 26, 2007
Filing Date:
July 31, 2003
Export Citation:
Assignee:
Hi-Tech Computer Corporation
International Classes:
G06F3/02; G06F3/023; G09G5/00; H01H13/70; H03M11/20
Domestic Patent References:
| JP61059519A | ||||
| JP62219017A | ||||
| JP7013671A | ||||
| JP2000013997A | ||||
| JP2002157067A |
Attorney, Agent or Firm:
Makoto Hagiwara