Instrument keyboard controller compatible with standard computer keyboard

Abstract

The invention relates to a keying controller which is compatible with the standard computer keyboard in the field of electronic applied technology. It comprises a power, a keyboard interface chip, a single chip machine, a dog circuit, a clock signal source, a PS / 2 standard keyboard interface and a serial interface. The power is connected with the keyboard interface chip, the single chip machine, the dog, the clock signal source, the power input end of the PS / 2 standard keyboard interface; the single chip machine reset signal, the clock signal input end are separately connected with the dog and the clock signal source; the keyboard interface chip key signal output end, the data end and the chip select end are separately connected with the chip machine out off port, the data end and the chip select end; the chip machine data output end is connected with the serial interface and the data end of the PS / 2 standard keyboard interface.

Description

technical field [0001] The invention belongs to the technical field of electronic applications and relates to an instrument keyboard control circuit, in particular to an instrument keyboard control device compatible with standard computer keyboards. technical background [0002] There are two kinds of existing keyboards, one is the common standard computer keyboard on the market, this kind of keyboard has PS / 2 standard keyboard interface, it communicates with the host through an internally integrated dedicated chip according to the PS / 2 protocol, and completes the keyboard input Function. This keyboard can only be used as an input device of a standard computer, and is therefore not suitable as a functional keyboard for various instruments because of its single-function limitation. Another kind is the keyboard on various instruments, and its circuit is made up of power supply 1, keyboard interface chip 2, single-chip microcomputer 3, watchdog circuit 4, clock signal source 5...

AI Technical Summary

Problems solved by technology

This kind of keyboard is generally integrated with the instrument itself. Each instrument needs to design its own keyboard circuit separately, and needs to compile different control software according to different instrument requirements, so it is not universal.

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