SPI Interface for 632/634

Low Speed "SPI" Synchronous Serial Interface

In addition to the RS-232 asynchronous serial interface, the 632 Intelligent Serial Display also features a SPI interface. This interface is a great, low-cost way to connect the display to microcontrollers that do not have a UART available. Any three general purpose output pins and a short "send byte" routine are all that is needed. The display can even be controlled by three of the pins on a PC's parallel port and the proper software. A microprocessor's hardware SPI port can also be used, provided that the port's speed can be set to satisfy the timing constraints. Another useful feature of SPI is that additional displays can be controlled with only one additional output port (SPI_CS) per display. All the other lines (/SPI_CLK and SPI_DATA) are common.

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