mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 962

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

Chapter 23 DQ256 Port Integration Module (S12XDQ256PIMV2)
23.0.5.73 Port AD1 Pull Up Enable Register 1 (PER1AD1)
Read: Anytime.
Write: Anytime.
This register activates a pull-up device on the respective PAD[15:8] 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.
962
PER1AD1[15:8]
Port
M
A
B
C
D
E
K
S
Reset
T
Field
W
R
7–0
Example: Selecting a pull-up device
PER1AD115 PER1AD114 PER1AD113 PER1AD112 PER1AD111 PER1AD110 PER1AD19
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.
23-67). All registers can be written at any time; however a specific configuration might
Direction
Data
yes
yes
yes
yes
yes
yes
yes
yes
yes
Figure 23-75. Port AD1 Pull Up Enable Register 1 (PER1AD1)
0
6
Table 23-67. Register Availability per Port
Table 23-66. PER1AD1 Field Descriptions
Input
yes
yes
yes
—
—
—
—
—
—
MC9S12XDP512 Data Sheet, Rev. 2.17
0
5
Reduced
Drive
yes
yes
yes
yes
0
4
Enable
Pull
yes
yes
yes
yes
Description
0
3
Polarity
Select
yes
yes
—
—
—
—
—
—
—
1
Wired-OR
0
2
Mode
yes
yes
—
—
—
—
—
—
—
Freescale Semiconductor
Interrupt
Enable
0
1
—
—
—
—
—
—
—
—
—
PER1AD18
Interrupt
Flag
0
0
—
—
—
—
—
—
—
—
—