隨著嵌入式系統的飛速發展，嵌入式PC 得到了廣泛應用。標準的PC 鍵盤由于體積大，按鍵多等原因在多數情況下不能滿足要求。本文在介紹PS/2 通信協議的基礎上，利用AT89C52 實現了一種PC 非標準鍵盤的設計。給出了其完整的硬件實現電路圖和主要的軟件開發方法。該鍵盤具有結構簡單、工作穩定、便于擴展等特點，并已在某型航空圖像回傳系統中得到具體應用。
關鍵詞：鍵盤，PS/2 協議，單片機，嵌入式系統
Abstract: with the rapid development of embedded system, embedded PC has been used widely in most fields. With its large buck and excessive keys, the standard keyboard for PC doesn’t meet users’ demands. This paper firstly introduces the PS/2 communication protocol, and then uses the AT89C52 microprocessor to design a PC nonstandard keyboard successfully. The hardware circuit diagram and the main software developing method are given out with details. The designed keyboard has the advantages of simple structure,
and can work steadily, and is also easy to extend. It has been used in an aeronautic image transmission system practically.
Keywords: keyboard, PS/2 protocol, single chip microprocessor, embedded system