Title:
SCANNING METHOD OF KEYBOARD
Document Type and Number:
Japanese Patent JP2001273079
Kind Code:
A
Abstract:
To detect key operations quickly without heavy CPU load.
In a scanning method of keyboard of which controlling means output scanning signals at specified time intervals and monitor the status of on and off of the keys, the controlling means have switching function of scanning signals which selectively outputs at least two kinds of scanning signals, the first scanning signal at tl time intervals and the second scanning signal at t2 time internals, and output the first scanning signal and perform keys scanning at a high speed when all the keys are off at t3 time intervals, and output the second scanning signal and switch to the key scanning at a low speed when either key is on.
More Like This:
Inventors:
TAKAHASHI SHUICHI
Application Number:
JP2000086352A
Publication Date:
October 05, 2001
Filing Date:
March 27, 2000
Export Citation:
Assignee:
HIOKI ELECTRIC WORKS
International Classes:
G06F3/023; H03M11/20; (IPC1-7): G06F3/023; H03M11/20
Attorney, Agent or Firm:
Takuya Ohara