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Pushbutton device and operation method

A technology of buttons and electronic devices, which is applied in the input/output direction of user/computer interaction, and can solve problems such as increasing the difficulty of circuit design.

Inactive Publication Date: 2004-05-05
HTC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will sacrifice the number of pins that other circuits can use, and also increases the difficulty of circuit design

Method used

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  • Pushbutton device and operation method
  • Pushbutton device and operation method
  • Pushbutton device and operation method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Please refer to figure 1 , which shows a block diagram of a key device provided according to a preferred embodiment of the present invention. The key device includes a parallel / serial conversion device 12 and a key module 15 for coupling to the controller 11 in an electronic device, such as a personal digital assistant. The buttons in the button module 15 are arranged in parallel, so as to have both expansibility and simplicity. Before the button module 15 is activated, the input / output pin KP of the controller 11 functions as an input pin. After the button module 15 is activated, an interrupt signal is fed into the input / output pin KP. After receiving the interrupt signal, the controller 11 converts the function of the input / output pin KP into an output pin, and feeds a driving potential into the key module 15 through the input / output pin KP, so that the key module 15 outputs a Parallel signal DP. Next, the controller 11 feeds the load signal LOAD into the parallel / ...

Embodiment 2

[0046] Then please refer to Figure 4, which shows a block diagram of a key device provided according to the second embodiment of the present invention. The key device includes a key module 45 , a conversion circuit 42 , a control circuit 411 and an identification circuit 415 , wherein the control circuit 411 and the identification circuit 415 can be provided in the microcontroller 41 . When a certain (or some) key in the key module 45 is pressed, the key module 45 outputs a low-level interrupt signal INT to the control circuit 411 . When the control circuit 411 receives the interrupt signal INT, it will feed a high-level driving potential DV into the conversion circuit 42, so that the conversion circuit 42 receives the bit data group BDP generated by the button module 45 in parallel, wherein the bit data The group BDP corresponds to the state in which the button module 45 is pressed, and may include several bits of data, for example, eight. After the conversion circuit 42 r...

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Abstract

A key unit is composed of a parallel-serial converter and a key module, which are coupled with a controller. The keys in key module are configured in parallel mode. After a key is pressed, an interrupt signal is fed to controller for feeding a drive level to the key module. The key module then generates a parallel signal which is read out by the parallel-serial converter and then latched. Then the parallel signal can be read out by clock signals in serial mode to know the state of key module.

Description

technical field [0001] The present invention relates to a key device and an operating method, and more particularly, to a key device and a method for reading key signals thereof. Background technique [0002] At present, in the circuit design of the key device, the direct type and the matrix type are more common. The so-called direct-type button device refers to directly connecting the button to a general purpose input and output (GPIO) pin of the controller, and the controller itself directly determines the state of the button. Although this structure has the advantages of simplicity and directness, since each button has a dedicated GPIO pin, when a large number of buttons are required, many GPIO pins will be occupied. Due to the limited GPIO pins of the controller, it is impossible to waste precious GPIO pins on the button circuit, which is a design limitation of the direct-type button device. In addition to being unable to apply the direct key device to the circuit desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/02
Inventor 彭昱钧何绍钧叶西城徐志铭
Owner HTC CORP
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