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Rabbit 6000 User’s Manual
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157
15.3 Operation
The following steps must be taken before using Parallel Port H.
1. Select the desired input/output direction for each pin via PHDDR.
2. Select high/low or open-drain functionality for outputs via PHDCR.
3. If a particular drive strength, slew rate, or pullup/down status is desired for a Parallel Port H pin, set
that in the appropriate PHxCR.
4. If an alternative peripheral output function is desired for a pin, select it via PHALR or PHAHR and
then enable it via PHFR. Refer to the appropriate peripheral chapter for further use of that pin.
5. All these settings will be superseded if a 16-bit memory interface is selected since Parallel Port H is
used for the upper half of the data bus in that mode.
Once Parallel Port H is set up, data can be read or written by accessing PHDR. The value of an output pin
read in from PHDR will reflect its current output value, but any value written to an input pin will not
appear on that pin until that pin becomes an output.
If one of the Flexible Interface Modules has been enabled to use Parallel Port H, writing to PHDR will no
longer change the state of the pins, and the settings of PHFR, PHALR, and PHAHR will be ignored. The
other Parallel Port H registers are still valid. Refer to Chapter 33 for more details.
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