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BF518 GRIO input and output driver

Question asked by ABC on Oct 20, 2009
Latest reply on Jan 28, 2010 by JoeT

The ADSP-BF51x Blackfin Processor Hardware Reference


on page 9-15:

"Once the input driver of a GPIO pin is enabled, the GPIO is not allowed to operate as an output anymore. Never enable the input driver (by setting PORTxIO_INEN

bits) and the output driver (by setting PORTxIO_DIR bits) for the same GPIO."


on page 9-19:

When the GPIO’s input drivers are enabled while the GPIO direction registers configure it as an output, software can trigger a GPIO interrupt by writing to the data/set/toggle registers. The interrupt service routine should clear the GPIO to acknowledge the request."


Why requirements contradict each other?