The 68338 has a powerful Queued Serial Peripheral Interface that allows simple hardware expansion to over five hundreds different SPI compatible devices. The circuit at right demonstrates glueless expansion adding a second UART (from the previous section) 11 A-D channels with 12-bit resolution, 16 voltage output 10-bit D-A channels, and 32 individually programmable bidirectional digital I/O pins.

The table below lists some of the manufacturers of SPI compatible devices and their product offerings. This is by no means complete, but it does give you an idea of the expansion possibilities just working the serial bus.

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