Keyboard circuit and keyboard control system

Abstract

The invention relates to a keyboard circuit and a keyboard control system. The keyboard circuit is connected with i ports of a controller, wherein each port is connected into a high electric level; the keyboard circuit comprises i first keys, j second keys and j key control units and j is a natural number; one end of each first key is grounded and the other ends of the different first keys are correspondingly connected with the different ports respectively; one end of each second key is grounded and the other ends of the different second keys are correspondingly connected with one end of different key control units respectively; the other ends of the key control units are connected with m ports in all the ports; the combination manners of one group of the ports connected with the other ends of the different key control units are different; and each key control unit is used for enabling the electric levels of all the ports connected with the corresponding key control units to be lowered to low electric levels after the second keys connected with the corresponding key control units are pressed down. According to the keyboard circuit and the keyboard control system, whether the keys are pressed down or not is identified through the different port combinations, so that the utilization rate of the ports is increased.

Description

technical field [0001] The invention relates to the technical field of keyboards, in particular to a keyboard circuit and a keyboard control system. Background technique [0002] The keyboard is the most commonly used and most important input device, through which English letters, numbers, punctuation marks, etc. can be input into the computer, so as to issue commands and input data to the computer. With the continuous expansion of the application field of microcomputer systems, there are more and more application systems with multiple buttons. [0003] In a traditional keyboard circuit, a button usually corresponds to a port of a controller (for example: MCU (Microcontroller Unit, micro control unit)), so that whether the button is pressed can be judged according to the level of the port. However, due to the limited number of ports of the controller, in the case of a large number of buttons, the port resources of the controller are not enough to be allocated, and if a cont...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a keyboard circuit and a keyboard control system for the problem that the port resources of the controller are insufficiently allocated when the number of keys is required to be large.

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