LM3S308 Luminary Micro, Inc, LM3S308 Datasheet - Page 151
LM3S308
Manufacturer Part Number
LM3S308
Description
Lm3s308 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S308.pdf
(419 pages)
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Reset
Reset
Type
Type
GPIO Digital Enable (GPIODEN)
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
Offset 0x51C
Type R/W, reset 0x0000.00FF
June 04, 2008
Bit/Field
31:8
7:0
RO
RO
31
15
0
0
RO
RO
Register 18: GPIO Digital Enable (GPIODEN), offset 0x51C
Note:
The GPIODEN register is the digital input enable register. By default, all GPIO signals are configured
as digital inputs at reset. If a pin is being used as a GPIO or its Alternate Hardware Function, it
should be configured as a digital input. The only time that a pin should not be configured as a digital
input is when the GPIO pin is configured to be one of the analog input signals for the analog
comparators.
30
14
0
0
RO
RO
29
13
reserved
0
0
Name
Pins configured as digital inputs are Schmitt-triggered.
DEN
RO
RO
28
12
0
0
reserved
RO
RO
27
11
0
0
Type
R/W
RO
RO
RO
26
10
0
0
RO
RO
Reset
25
0xFF
0x00
0
9
0
Preliminary
RO
RO
24
0
8
0
reserved
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.
Digital Enable
The DEN values are defined as follows:
Value
0
1
R/W
RO
23
0
7
1
Description
Digital functions disabled.
Digital functions enabled.
R/W
RO
22
0
6
1
R/W
RO
21
0
5
1
R/W
RO
20
0
4
1
DEN
R/W
RO
19
0
3
1
LM3S308 Microcontroller
R/W
RO
18
0
2
1
R/W
RO
17
0
1
1
R/W
RO
16
0
0
1
151
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