LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
Up to 171 General-Purpose Input/Output (GPIO) pins.
GPIO registers are located on the AHB for fast access. The DMA supports GPIO
ports.
Up to eight GPIOs can be selected as Pin Interrupts (PINT), triggered by rising,
falling or both input edges.
Two GPIO Grouped Interrupts (GINT) enable an interrupt based on a logical
(AND/OR) combination of input states.
Analog peripherals:
12-bit ADC with 12 input channels and with multiple internal and external trigger
inputs and sample rates of up to 5.0 MSamples/sec. The ADC supports two
independent conversion sequences.
Integrated temperature sensor connected to the ADC.
DMIC subsystem includes a dual-channel PDM microphone interface with decimators,
filtering, and hardware voice activity detection. The processed output data can be
routed directly to an I2S interface if needed.
Timers:
Five 32-bit general purpose timers/counters. All five timers support up to four
capture inputs and four compare outputs, PWM mode, and external count input.
Specific timer events can be selected to generate DMA requests.
One SCTimer/PWM with eight input and ten output functions (including capture and
match). Inputs and outputs can be routed to or from external pins and internally to
or from selected peripherals. Internally, the SCTimer/PWM supports 16
match/captures, 16 events, and 16 states.
32-bit Real-time clock (RTC) with 1 s resolution running in the always-on power
domain. A timer in the RTC can be used for wake-up from all low power modes
including deep power-down, with 1 ms resolution.
Multiple-channel multi-rate 24-bit timer (MRT) for repetitive interrupt generation at
up to four programmable, fixed rates.
Windowed Watchdog Timer (WWDT).
Repetitive Interrupt Timer (RIT) for debug time stamping and for general purpose
use.
Security features:
Secure Hash Algorithm (SHA1/SHA2) module supports boot with dedicated DMA
controller.
Clock generation:
12 MHz internal Free Running Oscillator (FRO). This oscillator provides a
selectable 48 MHz or 96 MHz output, and a 12 MHz output (divided down from the
selected higher frequency) that can be used as a system clock. The FRO is
trimmed to 1 % accuracy over the entire voltage and temperature range.
Crystal oscillator with an operating range of 1 MHz to 25 MHz.
Watchdog Oscillator (WDTOSC) with a frequency range of 6 kHz to 1.5 MHz.
32.768 kHz low-power RTC oscillator.
System PLL allows CPU operation up to the maximum CPU rate and can run from
the main oscillator, the internal FRO, the watchdog oscillator or the 32.768 KHz
RTC oscillator.
Two additional PLLs for USB clock and audio subsystem.
Independent clocks for the SPIFI interface, ADC, USBs, and the audio subsystem.
LPC540xx
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
3 of 168
NXP [ NXP ]
