32-18
MC9328MX1 Reference Manual
MOTOROLA
GPIO Module and I/O Multiplexer (IOMUX)
32.5.6 Sample Status Registers
The read-only Sample Status Registers contain the value of the GPIO pins for the port. The register is
updated on every clock. The contents are used as a status value when the pins are configured as inputs.
There are four distinct Sample Status Registers; each holds the data for one of the four GPIO ports (Port A,
Port B, Port C, and Port D).
SSR_A
SSR_B
SSR_C
SSR_D
Port A Sample Status Register
Port B Sample Status Register
Port C Sample Status Register
Port D Sample Status Register
Addr
0x0021C024
0x0021C124
0x0021C224
0x0021C324
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
SSR
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
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
SSR
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
Table 32-14. Sample Status Register Description
Name
Description
Settings
SSR [i]
Bits 31
–
0
Sample Status
—Contains the value of the GPIO pin [i]. It is sampled
on every clock.
0 = Pin value is low
1 = Pin value is high
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