LM3S613 Datasheet, PDF (258/591 Pages) List of Unclassifed Manufacturers – Microcontroller

General-Purpose Input/Outputs (GPIOs)
Register 18: GPIO Digital Enable (GPIODEN), offset 0x51C
Note: Pins configured as digital inputs are Schmitt-triggered.
The GPIODEN register is the digital 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.
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
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
DEN
Type RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Bit/Field
31:8
7:0
Name
reserved
DEN
Type
RO
R/W
Reset
0x00
0xFF
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 Description
0 Digital functions disabled.
1 Digital functions enabled.
258
July 14, 2014
Texas Instruments-Production Data