LM3S5K36 Datasheet, PDF (422/1050 Pages) Texas Instruments – Stellaris® LM3S5K36 Microcontroller

General-Purpose Input/Outputs (GPIOs)
Register 8: GPIO Masked Interrupt Status (GPIOMIS), offset 0x418
The GPIOMIS register is the masked interrupt status register. If a bit is set in this register, the
corresponding interrupt has triggered an interrupt to the interrupt controller. If a bit is clear, either
no interrupt has been generated, or the interrupt is masked.
In addition to providing GPIO functionality, PB4 can also be used as an external trigger for the ADC.
If PB4 is configured as a non-masked interrupt pin (the appropriate bit of GPIOIM is set), an interrupt
for Port B is generated, and an external trigger signal is sent to the ADC. If the ADC Event
Multiplexer Select (ADCEMUX) register is configured to use the external trigger, an ADC conversion
is initiated. See page 557.
If no other Port B pins are being used to generate interrupts, the Interrupt 0-31 Set Enable (EN0)
register can disable the Port B interrupts, and the ADC interrupt can be used to read back the
converted data. Otherwise, the Port B interrupt handler must ignore and clear interrupts on PB4 and
wait for the ADC interrupt, or the ADC interrupt must be disabled in the EN0 register and the Port
B interrupt handler must poll the ADC registers until the conversion is completed. See page 121 for
more information.
GPIOMIS is the state of the interrupt after masking.
GPIO Masked Interrupt Status (GPIOMIS)
GPIO Port A (APB) base: 0x4000.4000
GPIO Port A (AHB) base: 0x4005.8000
GPIO Port B (APB) base: 0x4000.5000
GPIO Port B (AHB) base: 0x4005.9000
GPIO Port C (APB) base: 0x4000.6000
GPIO Port C (AHB) base: 0x4005.A000
GPIO Port D (APB) base: 0x4000.7000
GPIO Port D (AHB) base: 0x4005.B000
GPIO Port E (APB) base: 0x4002.4000
GPIO Port E (AHB) base: 0x4005.C000
Offset 0x418
Type RO, reset 0x0000.0000
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
MIS
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
Bit/Field
31:8
7:0
Name
reserved
MIS
Type
RO
RO
Reset
0
0x00
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.
GPIO Masked Interrupt Status
Value Description
1 An interrupt condition on the corresponding pin has triggered
an interrupt to the interrupt controller.
0 An interrupt condition on the corresponding pin is masked or
has not occurred.
A bit is cleared by writing a 1 to the corresponding bit in the GPIOICR
register.
422
January 21, 2012
Texas Instruments-Production Data