Datasheet

LPC11E1X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 1.1 — 24 September 2013 8 of 62
NXP Semiconductors
LPC11E1x
32-bit ARM Cortex-M0 microcontroller
6.2 Pin description
Table 3 shows all pins and their assigned digital or analog functions in order of the GPIO
port number. The default function after reset is listed first. All port pins have internal
pull-up resistors enabled after reset except for the true open-drain pins PIO0_4 and
PIO0_5.
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 3. Pin description
Symbol
HVQFN33 LQFP48 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.
-I/OPIO0_0 — General purpose digital input/output pin.
PIO0_1/CLKOUT/
CT32B0_MAT2
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.
-OCLKOUT — Clockout pin.
-OCT32B0_MAT2 — Match output 2 for 32-bit timer 0.
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 9 14 19
[3]
I; PU I/O PIO0_3 — General purpose digital input/output pin.
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.
PIO0_6/SCK0 15 22 29
[3]
I; PU I/O PIO0_6 — General purpose digital input/output pin.
-I/OSCK0 — Serial clock for SSP0.
PIO0_7/CTS
16 23 30
[5]
I; PU I/O PIO0_7 — General purpose digital input/output pin
(high-current output driver).
-ICTS
— Clear To Send input for USART.