LM3S2608 Luminary Micro, Inc, LM3S2608 Datasheet - Page 191

• Manufacturer Part Number: LM3S2608
• Description: Lm3s2608 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

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
GPIO Port F base: 0x4002.5000
GPIO Port G base: 0x4002.6000
GPIO Port H base: 0x4002.7000
Offset 0x51C
Type R/W, reset -
July 26, 2008
Bit/Field
31:8
7:0
RO
RO
31
15
0
0
Register 18: GPIO Digital Enable (GPIODEN), offset 0x51C
Note:
The GPIODEN register is the digital enable register. By default, with the exception of the GPIO
signals used for JTAG/SWD function, all other GPIO signals are configured out of reset to be undriven
(tristate). Their digital function is disabled; they do not drive a logic value on the pin and they do not
allow the pin voltage into the GPIO receiver. To use the pin in a digital function (either GPIO or
alternate function), the corresponding GPIODEN bit must be set.
RO
RO
30
14
0
0
reserved
RO
RO
29
13
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
Reset
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.
Digital Enable
The DEN values are defined as follows:
Value
reserved
0
1
R/W
RO
23
Description
Digital functions disabled.
Digital functions enabled.
Note:
0
7
-
R/W
RO
22
0
6
-
The default reset value for the GPIOAFSEL,
GPIOPUR, and GPIODEN registers are 0x0000.0000
for all GPIO pins, with the exception of the five
JTAG/SWD pins (PB7 and PC[3:0]). These five pins
default to JTAG/SWD functionality. Because of this,
the default reset value of these registers for GPIO
Port B is 0x0000.0080 while the default reset value
for Port C is 0x0000.000F.
R/W
RO
21
0
5
-
R/W
RO
20
0
4
-
DEN
LM3S2608 Microcontroller
R/W
RO
19
0
3
-
R/W
RO
18
0
2
-
R/W
RO
17
0
1
-
R/W
RO
16
0
0
-
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