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Rabbit 6000 User’s Manual
digi.com
94
8. P
ARALLEL
P
ORT
A
8.1 Overview
Parallel Port A is a byte-wide port that can be used as an input or an output port. Parallel Port A is also
used as the data bus for the slave port and external I/O bus. The Slave Port Control Register (SPCR) is
used to configure how Parallel Port A is used. Parallel Port A is an input after reset. If the SMODE pins
have selected the slave port bootstrap mode, Parallel Port A will be the slave port data bus until disabled by
the processor. Parallel Port A can also be used as an external I/O data bus to isolate external I/O from the
main data bus.
The drive strength and slew rate can be individually controlled for each Parallel Port A pin. In addition, a
75 k
pullup or pulldown resistor can be enabled on each pin.
Note that it is possible for either Flexible Interface Module to use any of the parallel ports. See Chapter 33
for more information.
After reset, the default condition for Parallel Port A is all inputs. When PADR is read, the actual voltage on
the pins is returned, whether the port is set as an input or an output.
Table 8-1. Parallel Port A Pin Alternate Output Functions
Pin Name
Slave Port
Data Bus
External I/O
Bus
PA[7:0]
SD[7:0]
ID[7:0]
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