Rabbit 6000 User’s Manual
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13.2.4 Interrupts
External interrupts can be accepted from any pin on Parallel Port F; see Chapter 7 for more details.
13.3 Operation
The following steps must be taken before using Parallel Port F.
1. Select the desired input/output direction for each pin via PFDDR.
2. Select high/low or open-drain functionality for outputs via PFDCR.
3. If a particular drive strength, slew rate, or pullup/down status is desired for a Parallel Port F pin, set
that in the appropriate PFxCR.
4. If an alternative peripheral output function is desired for a pin, select it via PFALR or PFAHR and
then enable it via PFFR. 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 PFDR. Read PFDR to learn the current
state of a Parallel Port F pin; any value written to an input pin will not appear on that pin until that pin
becomes an output.
It is possible to enable a Flexible Interface Module to override Parallel Port F, which is a different option
than the alternate output selection of the FIMA interface. If one of the Flexible Interface Modules has been
enabled to override Parallel Port F, writing to PFDR will no longer change the state of the pins, and the set-
tings of PFFR, PFALR, and PFAHR will be ignored. The other Parallel Port F registers are still valid.
Refer to Chapter 33 for more details.
Summary of Contents for 6000
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