UM10503
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User manual
Rev. 1.3 — 6 July 2012
338 of 1269
NXP Semiconductors
UM10503
Chapter 17: LPC43xx GPIO
17.5.1.6 Pin interrupt active level (falling edge) interrupt set register
For each of the 8 pin interrupts selected in the PINTSELn registers (see
and
), one bit in the SIENF register sets the corresponding bit in the IENF register
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
set.
•
If the pin interrupt mode is level sensitive (PMODE = 1), the HIGH-active interrupt is
selected.
17.5.1.7 Pin interrupt active level (falling edge interrupt) clear register
For each of the 8 pin interrupts selected in the PINTSELn registers (see
and
), one bit in the CIENF register sets the corresponding bit in the IENF register
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
cleared.
•
If the pin interrupt mode is level sensitive (PMODE = 1), the LOW-active interrupt is
selected.
Table 190. Pin interrupt active level (falling edge) interrupt enable register (IENF, address
0x4008 7010) bit description
Bit
Symbol Description
Reset
value
Access
7:0
ENAF
Enables the falling edge or configures the active level interrupt
for each pin interrupt. Bit n configures the pin interrupt selected
in PINTSELn.
0 = Disable falling edge interrupt or set active interrupt level
LOW.
1 = Enable falling edge interrupt enabled or set active interrupt
level HIGH.
0
R/W
31:8 -
Reserved.
-
-
Table 191. Pin interrupt active level (falling edge interrupt) set register (SIENF, address
0x4008 7014) bit description
Bit
Symbol
Description
Reset
value
Access
7:0
SETENAF Ones written to this address set bits in the IENF, thus
enabling interrupts. Bit n sets bit n in the IENF register.
0 = No operation.
1 = Select HIGH-active interrupt or enable falling edge
interrupt.
NA
WO
31:8
-
Reserved.
-
-