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spru620 p39 ch7
Using HPI Pins for General-Purpose I/O
When the HPI is enabled (HPIENA signal high), the HPI data bus pins can also be used for general-purpose I/O (GPIO). In the 16-bit nonmultiplexed mode, GPIO can be performed on HD[15:0]. In the 8-bit multiplexed mode, pins HD[7:0] can be GPIO pins.
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