mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 882

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 22 DP512 Port Integration Module (S12XDP512PIMV2)
22.4.1.2
This is a read-only register and always returns the buffered state of the pin
22.4.1.3
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
22.4.1.4
If the pin is used as an output this register allows the configuration of the drive strength.
22.4.1.5
This register turns on a pull-up or pull-down device. It becomes active only if the pin is used as an input
or as a wired-OR output.
22.4.1.6
This register selects either a pull-up or pull-down device if enabled. It becomes active only 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. If the pin is
used as an interrupt input this register selects the active interrupt edge.
22.4.1.7
If the pin is used as an output this register turns off the active high drive. This allows wired-OR type
connections of outputs.
882
Input Register
Data Direction Register
Reduced Drive Register
Pull Device Enable Register
Polarity Select Register
Wired-OR Mode Register
Figure 22-76. Illustration of I/O Pin Functionality
Module
DDR
PTI
PT
MC9S12XDP512 Data Sheet, Rev. 2.17
module enable
data out
output enable
0
1
0
1
0
1
PIN
(Figure
22-76).
Freescale Semiconductor
(Figure
22-76).