JN5189 datasheet(35/92 Pages) NXP

Numer części	JN5189

Szczegółowy opis	IEEE 802.15.4 low power wireless MCU

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Producent	NXP [NXP Semiconductors]

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JN5189

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Product data sheet

Rev. 1.2 — June 2020

35 of 92

NXP Semiconductors

IEEE 802.15.4 low power wireless MCU

JN5189(T)/JN5188(T)

– 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

giving a maximum time-out period of over one minute.

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

interrupt requests. Either time-out can wake up the part from Low-power modes

(Sleep mode, Deep-sleep mode or Power-down mode)

8.10.3.2 General description

The RTC contains two timers:

• Real time clock

The real-time clock is a 32-bit up-counter which can be cleared or initialized by

software. Once enabled, it counts continuously at a 1 Hz clock rate as long as the

device is powered up and the RTC remains enabled.

The main purpose of the RTC is to count seconds and generate an alarm interrupt to

the processor whenever the counter value equals the value programmed into the

associated 32-bit match register.

If the part is in one of the reduced-power modes (Sleep, Deep-sleep, Power-down) an

RTC alarm interrupt can also wake up the part to exit the Power mode and begin

normal operation.

• High-resolution/wake-up timer

The time interval required for many applications, including waking the part up from a

Low-power mode, will often demand a greater degree of resolution than the

one-second minimum interval afforded by the main RTC counter. For these

applications, a higher frequency secondary timer has been provided.

This secondary timer is an independent, stand-alone wake-up or general-purpose

timer for timing intervals of up to 64 seconds with approximately one millisecond of

resolution.

The high-resolution/wake-up timer is a 16-bit down counter which is clocked at a 1

kHz rate when it is enabled. Writing any non-zero value to this timer will automatically

enable the counter and launch a countdown sequence. When the counter is being

used as a wake-up timer, this write can occur just prior to entering a reduced power

mode.

When a starting count value is loaded, the high-resolution/wake-up timer will turn on,

count from the pre-loaded value down to zero, generate an interrupt and/or a wake-up

command, and then turn itself off until re-launched by a subsequent software write.

8.10.4 Low Power Wake-up Timers

Two low power wake-up timers are available on the JN5189, driven from the 32 kHz

internal clock. They may run in power-down mode when the majority of the rest of the

device is powered down, to time low-power periods or other long period timings that may

be required by the application. The wake-up timers do not run during deep power-down

and may optionally be disabled in power-down mode through software control. When a

wake-up timer expires, it typically generates an interrupt; if the device is in deep sleep or

power down mode then the interrupt may be used as an event to end the low power

mode. Features include:

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