Functional expansion system for a touch pad

A method for expanding function of a touch pad of an electronic device which has at least a key and is capable of calling or executing application software or programs thereof, comprising following steps:

• (A) setting up an instruction data base with a plurality of data related to an operational instruction corresponding to a control signal;
• (B) receiving both key pressing signal and touch signal from the touch pad;
• (C) switching controlled status of the electronic device between a normal mode and a special mode according to the pressing signal;
• (D) recognizing touch coordinates, touch frequency or continuous locus according to the touch signal and reading out the operation instruction;
• and
• (E) creating the control signal corresponding to the operational instruction to call or execute one of the application software or programs based on the data saved in the instruction data base.

An electronic device in which a plurality of application software and programs are set up or saved, comprising:

• a touch pad creating touch signal while being point-hit or drawn a line;
• at least a key creating pressing signal while being pressed;
• and
• a functional expansion system for the touch pad;
• wherein the functional expansion system further comprises:
• a mode switching module receiving the pressing signal and switching a controlled status of the electronic device between normal mode and special mode according to the pressing signal according to the pressing signal;
• a signal receiving module connecting with the touch pad to receive the touch signal;
• an instruction data base providing a plurality of preset data related to an operational instruction corresponding to a control signal;
• and
• a recognizing and figuring module connecting with the mode switching module, the signal receiving module and the instruction data base respectively, recognizing one of parameters of touch coordinates, touch frequency and continuous locus under the special mode according to the touch signal, reading out the operational instruction and creating the control signal to call or execute an application software or program in the preset data saved in the instruction data base according to relation between the operational instruction and the control signal.