LPC5410X datasheet(31/95 Pages) NXP

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LPC5410x

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Product data sheet

Rev. 2.11 — 19 September 2019

31 of 95

NXP Semiconductors

LPC5410x

32-bit ARM Cortex-M4/M0+ microcontroller

• Debug mode.

7.18.4 RTC timer

The RTC block has two timers: main RTC timer, and high-resolution/wake-up timer. The

main RTC timer is a 32-bit timer that uses a 1 Hz clock and is intended to run continuously

as a real-time clock. When the timer value reaches a match value, an interrupt is raised.

The alarm interrupt can also wake up the part from any low power mode, if enabled.

The high-resolution or wake-up timer is a 16-bit timer that uses a 1 kHz clock and

operates as a one-shot down timer. When the timer is loaded, it starts counting down to 0

at which point an interrupt is raised. The interrupt can wake up the part from any low

power mode, if enabled. This timer is intended to be used for timed wake-up from deep

sleep, power down, or deep power-down modes. The high-resolution wake-up timer can

be disabled to conserve power if not used.

The RTC timer uses the 32 kHz clock input to create a 1 Hz or 1 kHz clock

7.18.4.1 Features

• The RTC oscillator has the following clock outputs:

– 32 kHz clock, selectable for system clock and CLKOUT pin.

– 1 Hz clock for RTC timing.

– 1 kHz clock for high-resolution RTC timing.

• 32-bit, 1 Hz RTC counter and associated match register for alarm generation.

• Separate 16-bit high-resolution/wake-up timer clocked at 1 kHz for 1 ms resolution

with a more that one minute maximum time-out period.

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

interrupt requests. Either time-out can wake up the part from any of the low power

modes, including deep power-down.

7.18.5 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.

7.18.5.1 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.

7.18.6 Repetitive Interrupt Timer (RIT)

The Repetitive Interrupt Timer provides a versatile means of generating interrupts at

specified time intervals, without using a standard timer. It is intended for repeating

interrupts that are not related to Operating System interrupts. However, it could be used

as an alternative to the System Tick Timer if there are different system requirements.

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