UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
339 of 1269
NXP Semiconductors
UM10503
Chapter 17: LPC43xx GPIO
17.5.1.8 Pin interrupt rising edge register
This register contains ones for pin interrupts selected in the PINTSELn registers (see
) on which a rising edge has been detected. Writing ones to this
register clears rising edge detection. Ones in this register assert an interrupt request for
pins that are enabled for rising-edge interrupts. All edges are detected for all pins selected
by the PINTSELn registers, regardless of whether they are interrupt-enabled.
17.5.1.9 Pin interrupt falling edge register
This register contains ones for pin interrupts selected in the PINTSELn registers (see
) on which a falling edge has been detected. Writing ones to this
register clears falling edge detection. Ones in this register assert an interrupt request for
pins that are enabled for falling-edge interrupts. All edges are detected for all pins
selected by the PINTSELn registers, regardless of whether they are interrupt-enabled.
Table 192. Pin interrupt active level (falling edge) interrupt clear register (CIENF, address
0x4008 7018) bit description
Bit
Symbol Description
Reset
value
Access
7:0
CENAF
Ones written to this address clears bits in the IENF, thus
disabling interrupts. Bit n clears bit n in the IENF register.
0 = No operation.
1 = LOW-active interrupt selected or falling edge interrupt
disabled.
NA
WO
31:8
-
Reserved.
-
-
Table 193. Pin interrupt rising edge register (RISE, address 0x4008 701C) bit description
Bit
Symbol
Description
Reset
value
Access
7:0
RDET
Rising edge detect. Bit n detects the rising edge of the pin
selected in PINTSELn.
Read 0: No rising edge has been detected on this pin since
Reset or the last time a one was written to this bit.
Write 0: no operation.
Read 1: a rising edge has been detected since Reset or the
last time a one was written to this bit.
Write 1: clear rising edge detection for this pin.
0
R/W
31:8 -
Reserved.
-
-
Table 194. Pin interrupt falling edge register (FALL, address 0x4008 7020) bit description
Bit
Symbol Description
Reset
value
Access
7:0
FDET
Falling edge detect. Bit n detects the falling edge of the pin
selected in PINTSELn.
Read 0: No falling edge has been detected on this pin since
Reset or the last time a one was written to this bit.
Write 0: no operation.
Read 1: a falling edge has been detected since Reset or the
last time a one was written to this bit.
Write 1: clear falling edge detection for this pin.
0
R/W
31:8
-
Reserved.
-
-