LM3S6633 Luminary Micro, Inc, LM3S6633 Datasheet - Page 180
LM3S6633
Manufacturer Part Number
LM3S6633
Description
Lm3s6633 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S6633.pdf
(534 pages)
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Reset
Reset
Type
Type
General-Purpose Input/Outputs (GPIOs)
GPIO Alternate Function Select (GPIOAFSEL)
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
Offset 0x420
Type R/W, reset -
180
Bit/Field
31:8
RO
RO
31
15
0
0
Register 10: GPIO Alternate Function Select (GPIOAFSEL), offset 0x420
The GPIOAFSEL register is the mode control select register. Writing a 1 to any bit in this register
selects the hardware control for the corresponding GPIO line. All bits are cleared by a reset, therefore
no GPIO line is set to hardware control by default.
The commit control registers provide a layer of protection against accidental programming of critical
hardware peripherals. Writes to protected bits of the GPIO Alternate Function Select (GPIOAFSEL)
register (see page 180) are not committed to storage unless the GPIO Lock (GPIOLOCK) register
(see page 190) has been unlocked and the appropriate bits of the GPIO Commit (GPIOCR) register
(see page 191) have been set to 1.
Important:
Caution – It is possible to create a software sequence that prevents the debugger from connecting to
the Stellaris
pins to their GPIO functionality, the debugger may not have enough time to connect and halt the
controller before the JTAG pin functionality switches. This may lock the debugger out of the part. This
can be avoided with a software routine that restores JTAG functionality based on an external or software
trigger.
RO
RO
30
14
0
0
reserved
RO
RO
29
13
0
0
Name
®
All GPIO pins are tri-stated by default (GPIOAFSEL=0, GPIODEN=0, GPIOPDR=0,
and GPIOPUR=0), with the exception of the five JTAG/SWD pins (PB7 and PC[3:0]).
The JTAG/SWD pins default to their JTAG/SWD functionality (GPIOAFSEL=1,
GPIODEN=1 and GPIOPUR=1). A Power-On-Reset (POR) or asserting RST puts both
groups of pins back to their default state.
microcontroller. If the program code loaded into flash immediately changes the JTAG
RO
RO
28
12
0
0
reserved
RO
RO
27
11
0
0
Type
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.
reserved
R/W
RO
23
0
7
-
R/W
RO
22
0
6
-
R/W
RO
21
0
5
-
R/W
RO
20
0
4
-
AFSEL
R/W
RO
19
0
3
-
R/W
RO
18
0
2
-
July 25, 2008
R/W
RO
17
0
1
-
R/W
RO
16
0
0
-
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