LPC83X datasheet(21/78 Pages) NXP

21 / 78 page

LPC83x

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Product data sheet

Rev. 1.2 — 4 April 2018

21 of 78

NXP Semiconductors

LPC83x

32-bit ARM Cortex-M0+ microcontroller

8.17 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.

8.17.1 Features

• 31-bit interrupt timer

• Four channels independently counting down from individually set values

• Bus stall, repeat and one-shot interrupt modes

8.18 Windowed WatchDog Timer (WWDT)

The watchdog timer resets the controller if software fails to service the watchdog timer

periodically within a programmable time window.

8.18.1 Features

• Internally resets chip if not periodically reloaded during the programmable time-out

period.

• Optional windowed operation requires reload to occur between a minimum and

maximum time period, both programmable.

• Optional warning interrupt can be generated at a programmable time prior to

watchdog time-out.

• Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be

disabled.

• Incorrect feed sequence causes reset or interrupt if enabled.

• Flag to indicate watchdog reset.

• Programmable 24-bit timer with internal prescaler.

• Selectable time period from (Tcy(WDCLK)  256  4) to (Tcy(WDCLK)  224  4) in

multiples of Tcy(WDCLK)  4.

• The WatchDog Clock (WDCLK) is generated by the dedicated watchdog oscillator

(WDOSC).

8.19 Self-Wake-up Timer (WKT)

The self-wake-up timer is a 32-bit, loadable down counter. Writing any non-zero value to

this timer automatically enables the counter and launches a count-down sequence. When

the counter is used as a wake-up timer, this write can occur prior to entering a reduced

power mode.

8.19.1 Features

• 32-bit loadable down counter. Counter starts automatically when a count value is

loaded. Time-out generates an interrupt/wake up request.

• The WKT resides in a separate, always-on power domain.

• The WKT supports three clock sources: an external clock on the WKTCLKIN pin, the

low-power oscillator, and the IRC. The low-power oscillator is located in the always-on

power domain, so it can be used as the clock source in Deep power-down mode.

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