LM3S8930 Luminary Micro, Inc, LM3S8930 Datasheet - Page 166
LM3S8930
Manufacturer Part Number
LM3S8930
Description
Lm3s8930 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S8930.pdf
(526 pages)
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General-Purpose Input/Outputs (GPIOs)
Table 9-3. GPIO Register Map
166
Offset
0x40C
0x41C
0x000
0x400
0x404
0x408
0x410
0x414
0x418
0x420
0x500
Name
GPIODATA
GPIODIR
GPIOIS
GPIOIBE
GPIOIEV
GPIOIM
GPIORIS
GPIOMIS
GPIOICR
GPIOAFSEL
GPIODR2R
■
■
■
■
■
■
Important:
Note:
GPIO Port B: 0x4000.5000
GPIO Port C: 0x4000.6000
GPIO Port D: 0x4000.7000
GPIO Port E: 0x4002.4000
GPIO Port F: 0x4002.5000
GPIO Port G: 0x4002.6000
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.
The default register type for the GPIOCR register is RO for all GPIO pins, with the exception
of the five JTAG/SWD pins (PB7 and PC[3:0]). These five pins are currently the only
GPIOs that are protected by the GPIOCR register. Because of this, the register type for
GPIO Port B7 and GPIO Port C[3:0] is R/W.
The default reset value for the GPIOCR register is 0x0000.00FF for all GPIO pins, with the
exception of the five JTAG/SWD pins (PB7 and PC[3:0]). To ensure that the JTAG port
is not accidentally programmed as a GPIO, these five pins default to non-committable.
Because of this, the default reset value of GPIOCR for GPIO Port B is 0x0000.007F while
the default reset value of GPIOCR for Port C is 0x0000.00F0.
The GPIO registers in this chapter are duplicated in each GPIO block, however,
depending on the block, all eight bits may not be connected to a GPIO pad. In those
cases, writing to those unconnected bits has no effect and reading those unconnected
bits returns no meaningful data.
Type
W1C
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.0000
0x0000.00FF
Reset
-
Preliminary
Description
GPIO Data
GPIO Direction
GPIO Interrupt Sense
GPIO Interrupt Both Edges
GPIO Interrupt Event
GPIO Interrupt Mask
GPIO Raw Interrupt Status
GPIO Masked Interrupt Status
GPIO Interrupt Clear
GPIO Alternate Function Select
GPIO 2-mA Drive Select
July 25, 2008
page
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