Keyboard display usually adopts the following three methods: 1. Use the keyboard display dedicated chip 8279 with parallel interface. 8279 has many external components (display driver, decoding, etc.), occupies a large circuit board area, and has a high overall cost. It is often overkill in small and medium-sized systems. 2. Use general parallel I/O (3) chip expansion (such as 8255, etc.). It needs to drive the display. The keyboard display scan takes up a lot of CPU time. 3. Use the keyboard display chip with FC bus. The MAX6955 driver in this article uses Maxim\'s keyboard scanning, LED display, 400kbps, FC-compatible 2-wire serial interface, which can greatly simplify the design.
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