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Rabbit 6000 User’s Manual
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130
12.3 Operation
The following steps must be taken before using Parallel Port E.
1. Select the desired input/output direction for each pin via PEDDR.
2. Select high/low or open-drain functionality for outputs via PEDCR.
3. If a particular drive strength, slew rate, or pullup/down resistor status is desired for a Parallel Port E
pin, set that in the appropriate PExCR.
4. If an alternative peripheral output function is desired for a pin, select it via PEALR or PEAHR and
then enable it via PEFR. Refer to the appropriate peripheral chapter for further use of that pin.
Once the port is set up, data can be read or written by accessing PEDR. Read PEDR to learn the current
state of a Parallel Port E pin; 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 E, writing to PEDR will no
longer change the state of the pins, and the settings of PEFR, PEALR, and PEAHR will be ignored. The
other Parallel Port E registers are still valid. Refer to Chapter 33 for more details.
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