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MCU (micro control unit) keyboard circuit and implementation method for same

The technology of a keyboard circuit and implementation method is applied in the direction of electric digital data processing, instrument, user/computer interaction input/output, etc., which can solve the problems of insufficient I/O resources of the MCU system, achieve resource saving, simple processing software, Effectiveness-enhancing effects

Inactive Publication Date: 2015-02-18
LAUNCH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a kind of MCU keyboard circuit and its implementation method, solve the problem of insufficient I / O resource of MCU system

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  • MCU (micro control unit) keyboard circuit and implementation method for same
  • MCU (micro control unit) keyboard circuit and implementation method for same

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] see figure 1 , the keyboard circuit proposed by the present invention includes: M keys (hereinafter described as S 1 , S 2 ,...,S M , 1≤i≤M), and M resistors R corresponding to the buttons one by one (hereinafter described as R 1 , R 2 ,...,R M ), public resistance R 9 , capacitance C 1 , Schmitt trigger, MCU. In this embodiment, the value of M is 8, that is, 8 buttons and 8 resistors R are included.

[0028] where the resistor R 1 One end of the connection is connected to the VCC power supply, and the other end is connected to the resistor R 2 to R 8 sequentially connected in se...

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Abstract

The invention provides an MCU (micro control unit) keyboard circuit and an implementation method for the same. The circuit comprises an MCU, M keys S1 to SM, M resistors R1 to RM, a common resistor and a Schmitt trigger, wherein one end of the resistor R1 is connected with a VCC power supply, and the other end of the resistor R1 is sequentially connected in series with the resistors R2 to RM; the end, not connected with the adjacent resistor, of the resistor RM is connected with one end of the key SM; one end of the key Si is connected with the connecting end, connected with the resistor Ri+1, of the resistor Ri, and i is more than or equal to 1 and less than or equal to M-1; the other ends of the keys S1 to SM are grounded through the common resistor; the connecting ends, connected with the common resistor, of the keys S1 to SM are connected with a first input interface of the MCU and the input end of the Schmitt trigger after being connected to a point A respectively; the output end of the Schmitt trigger is connected to a second input interface of the MCU. According to the MCU keyboard circuit and the implementation method for the same, MCU resources are greatly saved, and the advantages of simplicity, high efficiency, high reliability and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of keyboards, in particular to a keyboard circuit which is simple, efficient and especially saves MCU resources and its implementation method. Background technique [0002] Usually, the implementation method of the keyboard circuit of the MCU is as follows: [0003] (1) Independent keyboard method [0004] Generally, when the number of keys is not greater than 8, this method can be used, and each key is connected to an I / O line of an MCU. In this way, several keys need to occupy several I / O lines of the MCU. This method occupies more MCU hardware resources. [0005] (2) Matrix keyboard method [0006] Generally, when the number of keys is greater than 8, this method is often used: arrange the keys in a matrix form, connect the rows and columns of the matrix to the I / O lines of the MCU, and the number of I / O lines occupied by the MCU is the number of rows of the matrix. The sum of the number and the numbe...

Claims

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Application Information

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IPC IPC(8): G06F3/02
CPCG06F3/023
Inventor 刘均邓芳鸿李剑锋
Owner LAUNCH TECH CO LTD
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