UM10503
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User manual
Rev. 1.3 — 6 July 2012
337 of 1269
NXP Semiconductors
UM10503
Chapter 17: LPC43xx GPIO
17.5.1.3 Pin interrupt level (rising edge) interrupt set register
For each of the 8 pin interrupts selected in the PINTSELn registers (see
and
), one bit in the SIENR register sets the corresponding bit in the IENR register
depending on the pin interrupt mode configured in the ISEL register:
•
If the pin interrupt mode is edge sensitive (PMODE = 0), the rising edge interrupt is
set.
•
If the pin interrupt mode is level sensitive (PMODE = 1), the level interrupt is set.
17.5.1.4 Pin interrupt level (rising edge interrupt) clear register
For each of the 8 pin interrupts selected in the PINTSELn registers (see
and
), one bit in the CIENR register clears the corresponding bit in the IENR register
depending on the pin interrupt mode configured in the ISEL register:
•
If the pin interrupt mode is edge sensitive (PMODE = 0), the rising edge interrupt is
cleared.
•
If the pin interrupt mode is level sensitive (PMODE = 1), the level interrupt is cleared.
17.5.1.5 Pin interrupt active level (falling edge) interrupt enable register
For each of the 8 pin interrupts selected in the PINTSELn registers (see
and
), one bit in the IENF register enables the falling edge interrupt or the configures
the level sensitivity depending on the pin interrupt mode configured in the ISEL register:
•
If the pin interrupt mode is edge sensitive (PMODE = 0), the falling edge interrupt is
enabled.
•
If the pin interrupt mode is level sensitive (PMODE = 1), the active level of the level
interrupt (HIGH or LOW) is configured.
Table 188. Pin interrupt level (rising edge) interrupt set register (SIENR, address 0x4008
7008) bit description
Bit
Symbol
Description
Reset
value
Access
7:0
SETENRL
Ones written to this address set bits in the IENR, thus
enabling interrupts. Bit n sets bit n in the IENR register.
0 = No operation.
1 = Enable rising edge or level interrupt.
NA
WO
31:8
-
Reserved.
-
-
Table 189. Pin interrupt level (rising edge interrupt) clear register (CIENR, address 0x4008
700C) bit description
Bit
Symbol
Description
Reset
value
Access
7:0
CENRL
Ones written to this address clear bits in the IENR, thus
disabling the interrupts. Bit n clears bit n in the IENR
register.
0 = No operation.
1 = Disable rising edge or level interrupt.
NA
WO
31:8
-
Reserved.
-
-