LM3S1918 Luminary Micro, Inc, LM3S1918 Datasheet - Page 173
LM3S1918
Manufacturer Part Number
LM3S1918
Description
Lm3s1918 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S1918.pdf
(489 pages)
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Reset
Reset
Type
Type
GPIO Direction (GPIODIR)
GPIO Port A base: 0x4000.4000
GPIO Port B base: 0x4000.5000
GPIO Port C base: 0x4000.6000
GPIO Port D base: 0x4000.7000
GPIO Port E base: 0x4002.4000
GPIO Port F base: 0x4002.5000
GPIO Port G base: 0x4002.6000
GPIO Port H base: 0x4002.7000
Offset 0x400
Type R/W, reset 0x0000.0000
July 26, 2008
Bit/Field
31:8
7:0
RO
RO
31
15
0
0
Register 2: GPIO Direction (GPIODIR), offset 0x400
The GPIODIR register is the data direction register. Bits set to 1 in the GPIODIR register configure
the corresponding pin to be an output, while bits set to 0 configure the pins to be inputs. All bits are
cleared by a reset, meaning all GPIO pins are inputs by default.
RO
RO
30
14
0
0
reserved
RO
RO
29
13
0
0
Name
DIR
RO
RO
28
12
0
0
reserved
RO
RO
27
11
0
0
Type
R/W
RO
RO
RO
26
10
0
0
Reset
0x00
0x00
RO
RO
25
0
9
0
Preliminary
RO
RO
24
0
8
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
GPIO Data Direction
The DIR values are defined as follows:
Value
reserved
0
1
R/W
RO
23
Description
Pins are inputs.
Pins are outputs.
0
7
0
R/W
RO
22
0
6
0
R/W
RO
21
0
5
0
R/W
RO
20
0
4
0
DIR
LM3S1918 Microcontroller
R/W
RO
19
0
3
0
R/W
RO
18
0
2
0
R/W
RO
17
0
1
0
R/W
RO
16
0
0
0
173
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