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UM10503
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User manual
Rev. 1.3 — 6 July 2012
341 of 1269
NXP Semiconductors
UM10503
Chapter 17: LPC43xx GPIO
17.5.2.3 GPIO grouped interrupt port enable registers
The grouped interrupt port enable registers enable the pins which contribute to the
grouped interrupt. Each port n (n = 0 to 7) is associated with its own port enable register,
and the values of all registers together determine which pins contribute to the grouped
interrupt.
17.5.3 GPIO port register description
17.5.3.1 GPIO port byte pin registers
Each GPIO pin GPIOn[m] has a byte register in this address range. The byte pin registers
of GPIO port 0 correspond to registers B0 to B31, the byte pin registers of GPIO port 1
correspond to registers B32 to B63, etc.. Byte addresses are reserved for unused GPIO
port pins (see
Software typically reads and writes bytes to access individual pins but also can read or
write halfwords to sense or set the state of two pins, and read or write words to sense or
set the state of four pins.
Remark:
To read the signal on the GPIO input, enable the input buffer in the syscon block
for the corresponding pin (see
Table 197. GPIO grouped interrupt port polarity registers (PORT_POL, addresses 0x4008
8020 (PORT_POL0) to 0x4008 803C (PORT_POL7) (GROUP0 INT) and 0x4008 9020
(PORT_POL0) to 0x4008 903C (PORT_POL7) (GROUP1 INT)) bit description
Bit
Symbol Description
Reset
value
Access
31:0
POL
Configure pin polarity of port n pins for group interrupt. Bit m
corresponds to pin GPIOn[m] of port n.
0 = the pin is active LOW. If the level on this pin is LOW, the
pin contributes to the group interrupt.
1 = the pin is active HIGH. If the level on this pin is HIGH, the
pin contributes to the group interrupt.
1
-
Table 198. GPIO grouped interrupt port n enable registers (PORT_ENA, addresses 0x4008
8040 (PORT_ENA0) to 0x4008 805C (PORT_ENA7) (GROUP0 INT) and 0x4008 9040
(PORT_ENA0) to 0x4008 905C (PORT_ENA7) (GROUP1 INT)) bit description
Bit
Symbol Description
Reset
value
Access
31:0
ENA
Enable port n pin for group interrupt. Bit m corresponds to pin
GPIOPn[m] of port n.
0 = the port n pin is disabled and does not contribute to the
grouped interrupt.
1 = the port n pin is enabled and contributes to the grouped
interrupt.
0
-