UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 140 of 523
NXP Semiconductors
UM10462
Chapter 8: LPC11U3x/2x/1x Pin configuration
Every port pin has a corresponding IOCON register for programming the digital or analog
function, the pull-up/pull-down configuration, the repeater, and the open-drain modes.
The USART, counter/timer, and SSP functions are available on more than one port pin.
Table 134. LPC11U2x pin description
Symbol
Pin HVQFN33
Pin LQFP48
Pin LQFP64
Reset
state
[1]
Type Description
RESET
/PIO0_0 2 3 4
[2]
I; PU I RESET — External reset input with 20 ns glitch filter. A
LOW-going pulse as short as 50 ns on this pin resets the
device, causing I/O ports and peripherals to take on their
default states, and processor execution to begin at address
0. This pin also serves as the debug select input. LOW
level selects the JTAG boundary scan. HIGH level selects
the ARM SWD debug mode.
In deep power-down mode, this pin must be pulled HIGH
externally. The RESET
pin can be left unconnected or be
used as a GPIO pin if an external RESET
function is not
needed and Deep power-down mode is not used.
-I/OPIO0_0 — General purpose digital input/output pin.
PIO0_1/CLKOUT/
CT32B0_MAT2/
USB_FTOGGLE
34 5
[3]
I; PU I/O PIO0_1 — General purpose digital input/output pin. A LOW
level on this pin during reset starts the ISP command
handler or the USB device enumeration (see pin PIO0_3).
-OCLKOUT — Clockout pin.
-OCT32B0_MAT2 — Match output 2 for 32-bit timer 0.
-OUSB_FTOGGLE — USB 1 ms Start-of-Frame signal.
PIO0_2/SSEL0/
CT16B0_CAP0
81013
[3]
I; PU I/O PIO0_2 — General purpose digital input/output pin.
-I/OSSEL0 — Slave select for SSP0.
-ICT16B0_CAP0 — Capture input 0 for 16-bit timer 0.
PIO0_3/USB_VBUS 9 14 19
[3]
I; PU I/O PIO0_3 — General purpose digital input/output pin. A LOW
level on this pin during reset starts the ISP command
handler. A HIGH level during reset starts the USB device
enumeration.
-IUSB_VBUS — Monitors the presence of USB bus power.
PIO0_4/SCL 10 15 20
[4]
I; IA I/O PIO0_4 — General purpose digital input/output pin
(open-drain).
-I/OSCL — I
2
C-bus clock input/output (open-drain).
High-current sink only if I
2
C Fast-mode Plus is selected in
the I/O configuration register.
PIO0_5/SDA 11 16 21
[4]
I; IA I/O PIO0_5 — General purpose digital input/output pin
(open-drain).
-I/OSDA — I
2
C-bus data input/output (open-drain).
High-current sink only if I
2
C Fast-mode Plus is selected in
the I/O configuration register.
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