| 摘要 |
A method for detecting a key input signal in a mobile communication terminal is disclosed. The terminal has a plurality of keys constituting a key matrix structure with rows, columns, and a switch for connecting one of the rows to one of the columns, and including pull-up resisters for maintaining an input value of each row in the key matrix structure as a 'high' value. The method comprises designating all ports connected to the rows and the columns as input ports; selecting one of a plurality of the columns, changing the selected column into an output port, and outputting a 'low' signal to the output port; scanning the keys; and changing a column selected after the key scan back into an input port. |
