LPC81XM_15 datasheet(9/77 Pages) PHILIPS

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LPC81XM

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Product data sheet

Rev. 4.4 — 23 June 2015

9 of 77

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

SWDIO/PIO0_2/TMS 7

[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

[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

[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] 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

[9] I/O

I; PU

PIO0_6 — General purpose digital input/output pin.

VDDCMP — Alternate reference voltage for the analog

comparator.

PIO0_7

[2] I/O

I; PU

PIO0_7 — General purpose digital input/output pin.

PIO0_8/XTALIN

[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

[8] I/O

I; PU

PIO0_9 — General purpose digital input/output pin.

O-

XTALOUT — Output from the oscillator circuit.

PIO0_10

[3] IIA

PIO0_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

[3] IIA

PIO0_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

Type Reset

state

[1]

Description

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