本文針對人防報警系統的控制模塊進行設計，針對單片-機端口數目有限、端口驅動能
力較弱等問題，使用鍵盤管理芯片MAX72I9 實現數碼管顯示驅動，用DS 1302 實現真時鐘顯示，節省了單片機I/O 口，電路連接簡單。并給出了以上系統設計時的軟件流程，將各系統的實現分為不同功能模塊，以便于軟件維護和修改，同時簡單介紹了一些抗干擾措施。
關鍵字: 顯示驅動；模塊；微處理器；報警系統
Abstract: This paper designed control system of civil air defense alarm system. Because the SCM’s port number was limited and port driving power is feebleness, this design realizes nixie tube's Display drive with keyboard management chip MAX7219 and realizes true time display with DS1302, which can economize SCM I/O port and make circuit connection simplicity. Then this paper presents the software flow, divide the realization of the system into different function modules for the purpose of software maintenance and amendment. The paper also gives some antijamming measures.
Keywords: Display Driver; Module; Microprocessor; Alarming System