MC9S12NE64CPVE Datasheet, PDF (135/554 Pages) Freescale Semiconductor, Inc – MC9S12NE64 Device Overview

Functional Description
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 3-46).
PTI
0
1
PT
0
1
PAD
DDR
0
1
data out
Module _{output enable}
module enable
Figure 3-46. Illustration of I/O Pin Functionality
3.4.3 Reduced Drive Register
If the port is used as an output the register allows the configuration of the drive strength.
3.4.4 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.
3.4.5 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 or wired-or output. A pull-up device can also be
activated if the pin is used as a wired-or output.
3.4.6 Port T
This port is associated with the standard Timer.
In all modes, port T pins PT[7:4] can be used for either general-purpose I/O or standard timer I/O.
During reset, port T pins are configured as high-impedance inputs.
MC9S12NE64 Data Sheet, Rev. 1.1
Freescale Semiconductor
135