LM3S1512 Luminary Micro, Inc, LM3S1512 Datasheet - Page 169

• Manufacturer Part Number: LM3S1512
• Description: Lm3s1512 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

a. X=Ignored (don’t care bit)
9.3
July 25, 2008
Register
GPIOIEV
GPIOIM
Desired
Interrupt
Event
Trigger
0=Low level,
1=High level,
or negative
0=masked
Register Map
Table 9-3 on page 170 lists the GPIO registers. The offset listed is a hexadecimal increment to the
register’s address, relative to that GPIO port’s base address:
■
■
■
■
■
■
■
■
Important:
Note:
or positive
masked
1=not
edge
edge
GPIO Port A: 0x4000.4000
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
GPIO Port H: 0x4002.7000
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.
Pin 2 Bit Value
7
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.
X
0
6
a
X
0
5
X
0
Preliminary
4
X
0
3
X
0
2
1
1
LM3S1512 Microcontroller
1
X
0
0
X
0
169