TW223195B - Method and apparatus to detect additional functions of keypad - Google Patents

Method and apparatus to detect additional functions of keypad

Info

Publication number
TW223195B
TW223195B TW82109865A TW82109865A TW223195B TW 223195 B TW223195 B TW 223195B TW 82109865 A TW82109865 A TW 82109865A TW 82109865 A TW82109865 A TW 82109865A TW 223195 B TW223195 B TW 223195B
Authority
TW
Taiwan
Prior art keywords
ports
keypad
resistors
attached
states
Prior art date
Application number
TW82109865A
Other languages
Chinese (zh)
Inventor
Chyi-Chang Wu
Original Assignee
United Microelectronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Microelectronics Corp filed Critical United Microelectronics Corp
Priority to TW82109865A priority Critical patent/TW223195B/en
Application granted granted Critical
Publication of TW223195B publication Critical patent/TW223195B/en

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Abstract

A method to detect additional functions of keypad by using the existingI/O ports to detect the states of resistors attached to the ports, wherethe state is connected to power, ground or floating, comprises thefollowing steps: 1. Whenever a keypad is depressed, the output of the keypad scanningcircuit is hold for a period of time; 2. During the period, proceeding detecting the attached resistors'statesfor column I/O ports or row I/O ports and sending the detected data toa memory device for deciding the attached resistors' states for columnI/O ports or row I/O ports; 3. Stopping detecting the attached resistors' states and releasing thekeypad scanning circuit to continue the scanning.
TW82109865A 1993-11-23 1993-11-23 Method and apparatus to detect additional functions of keypad TW223195B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW82109865A TW223195B (en) 1993-11-23 1993-11-23 Method and apparatus to detect additional functions of keypad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW82109865A TW223195B (en) 1993-11-23 1993-11-23 Method and apparatus to detect additional functions of keypad

Publications (1)

Publication Number Publication Date
TW223195B true TW223195B (en) 1994-05-01

Family

ID=51348194

Family Applications (1)

Application Number Title Priority Date Filing Date
TW82109865A TW223195B (en) 1993-11-23 1993-11-23 Method and apparatus to detect additional functions of keypad

Country Status (1)

Country Link
TW (1) TW223195B (en)

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