Selecting a serial bus

摘要

At the heart of most of today's advanced electronic products is a microcontroller that communicates with one or more peripheral devices. At one time, microcontroller periphery was memory mapped and connected to the data and address bus. Chip-select signals were decoded from address lines to give each component its unique location in the limited address range. The access time was short, but the overhead inflated the package size and overall cost. The obvious alternative is a serial interface, and there are some options in this area.