mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 1028

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

Chapter 24 DG128 Port Integration Module (S12XDG128PIMV2)
24.0.5.65 Port AD1 Pull Up Enable Register 1 (PER1AD1)
Read: Anytime.
Write: Anytime.
This register activates a pull-up device on the respective PAD[7:0] pin if the port is used as input. This bit
has no effect if the port is used as output. Out of reset no pull-up device is enabled.
Functional Description
Each pin except PE0, PE1, and BKGD can act as general purpose I/O. In addition each pin can act as an
output from the external bus interface module or a peripheral module or an input to the external bus
interface module or a peripheral module.
A set of configuration registers is common to all ports with exceptions in the expanded bus interface and
ATD ports
not become active.
This device does not become active while the port is used as a push-pull output.
1028
Port
PER1AD1[7:0]
M
A
B
E
K
S
P
H
Reset
T
Field
W
R
7–0
Example: Selecting a pull-up device
PER1AD17
Data
(Table
yes
yes
yes
yes
yes
yes
yes
yes
yes
0
7
Pull Device Enable Port AD1 Register 1
0 Pull-up device is disabled.
1 Pull-up device is enabled.
24-60). All registers can be written at any time; however a specific configuration might
Direction
Data
PER1AD16
yes
yes
yes
yes
yes
yes
yes
yes
yes
Figure 24-67. Port AD1 Pull Up Enable Register 1 (PER1AD1)
0
6
Table 24-60. Register Availability per Port
Table 24-59. PER1AD1 Field Descriptions
Input
yes
yes
yes
yes
yes
—
—
—
—
PER1AD15
MC9S12XDP512 Data Sheet, Rev. 2.17
0
5
Reduced
Drive
yes
yes
yes
yes
yes
yes
PER1AD14
0
4
Enable
Pull
yes
yes
yes
yes
yes
yes
Description
PER1AD13
0
3
Polarity
Select
yes
yes
yes
yes
—
—
—
—
—
PER1AD12
1
Wired-OR
0
2
Mode
yes
yes
—
—
—
—
—
—
—
PER1AD11
Freescale Semiconductor
Interrupt
Enable
0
1
yes
yes
—
—
—
—
—
—
—
PER1AD10
Interrupt
Flag
yes
yes
0
0
—
—
—
—
—
—
—