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2.1.2. Data register

The data register is eight bits wide and is used to:

  • read the value input on those PrimeCell GPIO lines that are configured as inputs

  • program the value on those PrimeCell GPIO lines that are configured as outputs.

The same data register appears at 256 locations in the memory map. This allows you to use the address bus [9:2] as an additional bit masking feature.

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