Programming Model
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32-25
32.5.12 Pull_Up Enable Registers
The Pull_Up Enable Registers enable or disable the pull-up on each port pin. When the pull-up is disabled,
then the pin is tri-stated when not driven.
There are four distinct Pull_Up Enable Registers; each holds the data for one of the four GPIO ports (Port
A, Port B, Port C, and Port D).
NOTE:
The Port C Pull_Up Enable Register has a different reset value than the
other Port A, B or D Pull_Up Enable Registers.
PUEN_A
PUEN_B
PUEN_C
PUEN_D
Port A Pull_Up Enable Register
Port B Pull_Up Enable Register
Port C Pull_Up Enable Register
Port D Pull_Up Enable Register
Addr
0x0021C040
0x0021C140
0x0021C240
0x0021C340
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PUEN
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
1
1
1
1
1
1
1
1.
The reset value for PUEN_C is 0xF910FFFF.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0xFFFF/0xF910
1
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PUEN
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0xFFFF
Table 32-21. Pull_Up Enable Register Description
Name
Description
Settings
PUEN [i]
Bits 31–0
Pull_Up Enable
—Determines whether the port pin [i] is pulled up
1
to
a logic high. When the pin is configured as an input, clearing this bit
causes the signal to be tri-stated when not driven by an external
source. When the pin is configured as an output, clearing this bit
causes the signal to be tri-stated when it is not enabled.
1.
PUEN_B bit 11 is pulled down when the bit is set.
0 = Pin [i] is tri-stated when
not driven internally or
externally
1 = Pin [i] is pulled high
1
when not driven
internally or externally
Summary of Contents for DragonBall MC9328MX1
Page 68: ...1 12 MC9328MX1 Reference Manual MOTOROLA Introduction ...
Page 86: ...2 18 MC9328MX1 Reference Manual MOTOROLA Signal Descriptions and Pin Assignments ...
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Page 160: ...8 8 MC9328MX1 Reference Manual MOTOROLA System Control ...
Page 272: ...13 32 MC9328MX1 Reference Manual MOTOROLA DMA Controller ...
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