Datasheet

Port Integration Module
MC9S12DP256 — Revision 1.1
Port Integration Module
Data direction
register
This register defines whether the pin is used as an input or an output. If
a peripheral module controls the pin the contents of the data direction
register is ignored.
Figure 26 Illustration of I/O pin functionality
Reduced drive
register
If the port is used as an output the register allows the configuration of the
drive strength.
Pull device enable
register
This register turns on a pull-up or pull-down device. It becomes only
active if the pin is used as an input or as a wired-or output.
Polarity select
register
This register selects either a pull-up or pull-down device if enabled. It
becomes only active if the pin is used as an input. A pull-up device can
be activated if the pin is used as a wired-or output.
Port T This port is associated with the Enhanced Capture Timer module. In all
modes, port T pins PT[7:0] can be used for either general-purpose I/O,
or with the channels of the Enhanced Capture Timer. During reset, port
T pins are configured as high-impedance inputs.
I/O
DDR
MOD
do
obe
mod_en
PT
PTI
1
0
1
1
0
0
PAD
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Freescale Semiconductor, Inc.
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