Datasheet

Product data sheet Rev. 1.0 — 26 February 2019 59 of 123

NXP Semiconductors

LPC55S6x

32-bit ARM Cortex-M33 microcontroller

• RTC alarm and high-resolution/wake-up timer time-out each generate independent

interrupt requests that go to one NVIC channel. Either time-out can wake up the part

from any of the low power modes, including deep power-down.

• Eight 32-bit general purpose registers can retain data in deep power-down or in the

event of a power failure, provided there is battery backup.

7.27.5 Multi-Rate Timer (MRT)

The Multi-Rate Timer (MRT) provides a repetitive interrupt timer with four channels. Each

channel can be programmed with an independent time interval, and each channel

operates independently from the other channels.

7.27.5.1 Features

• 24-bit interrupt timer.

• Four channels independently counting down from individually set values.

• Repeat interrupt, one-shot interrupt, and one-shot bus stall modes.

7.27.6 OS Timer

42-bit free running timer with individual match/capture and interrupt generation logic used

as continuous time-base for the system, available in any reduced power modes. It runs on

32kHz clock source, allowing a count period of more than 4 years.

7.27.6.1 Features

• Central 42-bit, free-running gray-code event/timestamp timer.

• Match registers compared to the main counter to generate an interrupt and/or

wake-up event.

• Capture registers triggered by CPU command, readable via the AHB/IPS bus.

• APB interface for register access.

• IRQ and wake-up.

• Reads of gray-encoded timers are accomplished with no synchronization latency.

7.27.7 Micro-tick timer (UTICK)

The ultra-low power Micro-tick Timer, running from the Watchdog oscillator, can be used

to wake up the device from sleep and deep-sleep modes.

7.27.7.1 Features

• Ultra simple timer.

• Write once to start.

• Interrupt or software polling.

• Four capture registers that can be triggered by external pin transitions.