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使用LED显示驱动器代替单片微机对LED显示器直接控制,既减少了所使用的I/O线,又减轻了软件的负担。它综合了静态锁存显示和动态扫描显示的优点。本文先对显示驱动器MCl44997芯片作一简单介绍,然后,介绍利用并行输出口在串行输出程序控制下进行串行通讯的8048与显示驱动器接口,接着介绍本身具有串行外围接口(SPI)的8051与显示驱动器的接口。接口电路在进行串行通讯时,占用单片微机三条I/O线。不通讯时,仅占用一条I/0线,另外两条I/O线可作他用。
The use of LED display driver instead of single-chip direct control of the LED display, not only reduces the I / O lines used, but also reduce the burden on the software. It combines the advantages of static latch display and dynamic scan display. This article first makes a brief introduction to the display driver MCl44997 chip, and then introduces the use of parallel output port serial communication under the control of the serial output program 8048 and display driver interface, followed by its own serial peripheral interface (SPI) 8051 Interface with the display driver. Interface circuit in the serial communication, single-chip microcomputer occupies three I / O lines. Not communication, only occupy an I / 0 line, the other two I / O lines for other purposes.