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Pushbutton device and operation method

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

Inactive Publication Date: 2005-11-23
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 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 a controller 11 in an electronic device, such as a personal digital assistant. The buttons in the button module 15 are arranged in parallel to have expandability and simplicity. Before the key module 15 is touched, the input / output pin KP of the controller 11 functions as an input pin. After the key module 15 is touched, an interrupt signal is fed into the input / output pin KP. After receiving the interrupt signal, the controller 11 will convert the function of the input / output pin KP into an output pin, and feed a driving potential to 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 / serial conversion device 12, so ...

Embodiment 2

[0046] Then please refer to Figure 4, which shows a block diagram of a key device provided according to Embodiment 2 of the present invention. The button device includes a button module 45 , a conversion circuit 42 , a control circuit 411 and a recognition circuit 415 , wherein the control circuit 411 and the recognition circuit 415 can be set in the controller 41 . When a certain (or some) keys in the key module 45 are 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 key module 45 in parallel, wherein the bit data The group BDP corresponds to the status of the button module 45 being pressed, and may include several bits of data, for example, 8 bits. After the conversion circuit 42 receives the bit data g...

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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 in particular to a key device and a method for reading key signals. Background technique [0002] At present, in the circuit design of the key device, two kinds of direct type and matrix type are more common. The so-called direct key device refers to that the key is directly connected to the general purpose input output (GPIO) pin (pin) of the controller, and the state of the key is directly judged by the controller itself. Although this structure has the advantages of simplicity and directness, since each key has a dedicated GPIO pin, when a large number of keys are required, many GPIO pins will be occupied. Due to the limited GPIO pins of the controller, precious GPIO pins cannot be wasted unscrupulously on the key circuit, which is a limitation in the design of the direct key device. In addition to the fact that the direct key device cannot be applied to the circuit design ...

Claims

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Application Information

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Patent Type & Authority Patents(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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