ＭＣＵ和ＣＰＬＤ组成的船用仪表显示接口
摘 要：针对通常微控制器(Multi Control Unit, MCU)接口设计方法所需芯片种类多、印刷线路板面积大及设计复杂等缺点，采用复杂可编程逻辑器件(Complex Programmable Logic Device, CPLD)设计方法，合理设计智能仪器仪表的微控制器外围电路.微控制器外围的看门狗监视电路、接口电路、地址锁存器、地址译码器和I/O扩展接口由CPLD XC9572XL编程实现.CPLD多种数字逻辑系统功能的实现，使芯片种类和数量减少、管脚定义灵活、电路板设计简化.实验表明：系统体积缩小，系统的性能和可靠性提高.由MCU和CPLD组成的高性能和高可靠性的嵌入式仪器仪表为船用仪器仪表系统提供新的途径.
关键词：智能仪器仪表； 复杂可编程逻辑器件； 微控制器； 外围电路； 船用仪表
中图分类号：U665.14； TP273文献标志码：A
Display interface for marine instrument based on MCU and CPLD
XIA Yongminga, SHI Jingb
(a. Logistics Eng. College; b. Academy of Sci. & Tech., Shanghai Maritime Univ., Shanghai 200135, China)
Abstract： Due to the usual design method of the MCU interface has such disadvantages as too many types of chip needed, large area of printed board, complicated design, taken the advantage of the method of the complex programmable logic device CPLD, the microcontroller unit (MCU’s peripheral circuit of the intelligent instrumentation) is designed. The watchdog’s monitoring circuit, interface circuit, address latch, address decoder and expanding of the I/O are realized by programming the CPLD XC9572XL. The realization of multiple digital logic functions of the CPLD can reduce the type and the number of the chip. And the flexibility of the pin definition can simplify the design of the circuit board. Experiments show that the system size is reduced and the reliability and performance are improved. The embedded instrumentation with high-performance and high-reliability based on MCU and CPLD provides a new way for...
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