Datasheet

LPC81XM All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.3 — 22 April 2014 9 of 76
NXP Semiconductors
LPC81xM
32-bit ARM Cortex-M0+ microcontroller
SWDIO/PIO0_2/TMS 7 6 6 4
[2]
I/O I; PU SWDIO — Serial Wire Debug I/O. SWDIO is enabled by
default on this pin.
In boundary scan mode: TMS (Test Mode Select).
I/O - PIO0_2 — General purpose digital input/output pin.
SWCLK/PIO0_3/
TCK
6553
[2]
I/O I; PU SWCLK — Serial Wire Clock. SWCLK is enabled by default
on this pin.
In boundary scan mode: TCK (Test Clock).
I/O - PIO0_3 — General purpose digital input/output pin.
PIO0_4/WAKEUP/
TRST
5442
[6]
I/O I; PU PIO0_4 — General purpose digital input/output pin.
In ISP mode, this is the USART0 transmit pin U0_TXD.
In boundary scan mode: TRST
(Test Reset).
This pin triggers a wake-up from Deep power-down mode. If
you need to wake up from Deep power-down mode via an
external pin, do not assign any movable function to this pin.
This pin should be pulled HIGH externally before entering
Deep power-down mode. A LOW-going pulse as short as 50
ns causes the chip to exit Deep power-down mode and
wakes up the part.
RESET
/PIO0_5 4 3 3 1
[4]
I/O I; PU RESET — External reset input: 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.
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 or for any movable function if an external
RESET
function is not needed and the Deep power-down
mode is not used.
I- PIO0_5 — General purpose digital input/output pin.
PIO0_6/VDDCMP 18 15 15 -
[9]
I/O I; PU PIO0_6 — General purpose digital input/output pin.
AI - VDDCMP — Alternate reference voltage for the analog
comparator.
PIO0_7 17 14 14 -
[2]
I/O I; PU PIO0_7 — General purpose digital input/output pin.
PIO0_8/XTALIN 14 11 11 -
[8]
I/O I; PU PIO0_8 — General purpose digital input/output pin.
I- XTALIN — Input to the oscillator circuit and internal clock
generator circuits. Input voltage must not exceed 1.95 V.
PIO0_9/XTALOUT 13 10 10 -
[8]
I/O I; PU PIO0_9 — General purpose digital input/output pin.
O- XTALOUT — Output from the oscillator circuit.
PIO0_10 9 8 8 -
[3]
IIAPIO0_10 — General purpose digital input/output pin. Assign
I2C functions to this pin when true open-drain pins are
needed for a signal compliant with the full I2C specification.
PIO0_11 8 7 7 -
[3]
IIAPIO0_11 — General purpose digital input/output pin. Assign
I2C functions to this pin when true open-drain pins are
needed for a signal compliant with the full I2C specification.
Table 4. Pin description table (fixed pins)
Symbol
SO20/ TSSOP20 TSSOP16 XSON16 DIP8
Type Reset
state
[1]
Description