32-16
MC9328MX1 Reference Manual
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32.5.4 Data Registers
The Port X Data Register holds the value to be output from port X when a pin is configured as an output
and the Data Register is chosen in the Output Configuration Register 1 and Output Configuration
Register 2.
There are four distinct Data Registers; each holds the data for one of the four GPIO ports (Port A, Port B,
Port C, and Port D).
DR_A
DR_B
DR_C
DR_D
Port A Data Register
Port B Data Register
Port C Data Register
Port D Data Register
Addr
0x0021C01C
0x0021C11C
0x0021C21C
0x0021C31C
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
DR
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DR
TYPE
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 32-12. Data Register Description
Name
Description
Settings
DR [i]
Bits 31
–
0
Data
—Contains the GPIO output values when the Output
Configuration Registers select the Data Register as the output for the
pin (selection
11
).
0 = Drives the output signal
low
1 = Drives the output signal
high
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