MC9S12T64 Datasheet, PDF (268/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Port Integration Module (PIM)
Input register
Data direction
register
if the port is used as general purpose output. When reading this address,
the value of the pins is returned if the data direction register bits are set
to 0. If the data direction register bits are set to 1, the contents of the I/O
register is returned. This is independent of any other configuration.
This is a read-only register and always returns the value of the pin.
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.
PTI
0
PT
1
I/O
0
1
DDR
MOD
0
1
do
obe
mod_en
PAD
Reduced drive
register
Figure 39 Illustration of I/O pin functionality
If the port is used as an output the register allows the configuration of the
drive strength.
Pull device enable This register turns on a pull-up or pull-down device. It becomes only
register
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.
MC9S12T64Revision 1.1.1
Port Integration Module (PIM)
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