Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Keyboard control circuit of universal serial bus interface

A universal serial bus, control circuit technology, applied in the direction of input/output of user/computer interaction

Inactive Publication Date: 2003-04-23
VIA TECH INC
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when replacing other types of small keyboards in design, the software program must be rewritten to comply with the new key arrangement and functions.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Keyboard control circuit of universal serial bus interface
  • Keyboard control circuit of universal serial bus interface
  • Keyboard control circuit of universal serial bus interface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0011] According to the present invention, refer to figure 1 The preferred embodiment shown, is applicable to notebook computer and has the keyboard control circuit 100 of universal serial bus (USB) interface and comprises: shift register 102, keyboard matrix circuit 104, filter circuit 106, buffer circuit 108, address generator 110 . A comparison and selection unit 112 , a mapping device 114 and an interface conversion circuit 116 . For convenience of description, in a preferred embodiment, the number of keys of the small keyboard (keypad) supported by the keyboard matrix circuit 104 can reach 128, that is, the keyboard keys are arranged in 16 rows in the vertical direction and 8 columns in the horizontal direction (16× 8). The shift register 102 generates m (m=16) keyboard scan output signals SO_0˜SO_15 and a reference signal Xo according to the start sign...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The keyboard control circuit is applicable to notebook computer with several keyboard keys, it includes: mapping device for storing several key codes correspondent to keyboard keys; shift register for producing several keyboard saccding output signals and reference signals according to starting signal and clock signal; keyboard matrix circuit for receiving these keyboard scanning output signals and providing several keyboard scanning input signals; address generator for generating address signal according to the reference signal and triggered keyboard scanning input signal; comparison selector for selecting and outputing key code correspondent to address signal from mapping device and interface conversino circuit for converting the key code outputted by comparison selector unit into a differential signal meeting general serial bus specification.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a keyboard control circuit suitable for notebook computers and having a universal serial bus interface. Background technique [0002] The advent of the digital age, especially the advancement of personal computers, has improved human work efficiency, and the rapid development of notebook computers has brought great convenience to human work or life. Generally speaking, the peripheral input and output devices of the computer system are the bridge between the user and the computer. After the instruction of the operator, the relevant program will be executed according to the instruction. Among the peripheral input devices of the current computer, the keyboard is the most basic device. There are many keys on the keyboard, and each key corresponds to a key code, which may represent a character or a function. Generally, the keyboard used in the desktop computer has a keyboar...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F3/02
Inventor 林益明
Owner VIA TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com