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Rabbit 6000 User’s Manual
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109
10.3 Operation
The following steps must be taken before using Parallel Port C.
1. Select the desired input/output direction for each pin via PCDDR.
2. Select driven or open-drain functionality for outputs via PCDCR.
3. If a particular drive strength, slew rate, or pullup/down resistor status is desired for a Parallel Port C
pin, set that in the appropriate PCxCR.
4. If an alternate peripheral output function is desired for a pin, select it via PCALR or PCAHR and
then enable it via PCFR. 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 PCDR. The value in PCDR of an output
pin 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 C, writing to PCDR will no
longer change the state of the pins, and the settings of PCFR, PCALR, and PCAHR will be ignored. The
other Parallel Port C registers are still valid. Refer to Chapter 33 for more details.
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