Programming Model
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32-23
32.5.10 General Purpose Registers
The General Purpose Registers control a multiplexer in the IOMUX module. The settings in these registers
choose whether a pin is used for its primary peripheral function or for its alternate peripheral function (see
Figure 32-1 on page 32-2).
There are four distinct General Purpose Registers; each holds the data for one of the four GPIO ports (Port
A, Port B, Port C, and Port D).
GPR_A
GPR_B
GPR_C
GPR_D
Port A General Purpose Register
Port B General Purpose Register
Port C General Purpose Register
Port D General Purpose Register
Addr
0x0021C038
0x0021C138
0x0021C238
0x0021C338
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
GPR
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
GPR
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 32-19. General Purpose Register Description
Name
Description
Settings
GPR [i]
Bits 31
–
0
General Purpose
—Selects between the primary and alternate
functions of the pin. When the associated bit in the GIUS register is
set, this bit has no meaning.
Note:
Ensure that this bit is cleared when there is no alternate
function for a particular pin.
0 = Select primary pin
function
1 = Select alternate pin
function
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