ADUCM4050BCPZ-R7 datasheet(34/46 Pages) AD

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ADuCM4050

Data Sheet

Rev. A | Page 34 of 46

Table 26. RTC Features

Features

RTC0

RTC1 (FLEX_RTC)

Resolution of

Time Base

(Prescaling)

Counts time at 1 Hz in units of seconds. Operationally,

RTC0 always prescales to 1 Hz (for example, divide

by 32,768) and always counts real time in units of

seconds.

Can prescale the clock by any power of two from 0 to 15. It can

count time in units of any of these 16 possible prescale settings.

For example, the clock can be prescaled by 1, 2, 4, 8, …, 16,384, or

32,768.

Source Clock

LFXTAL.

Depending on the low frequency multiplexer configuration, the

RTC is clocked by the LFXTAL or the LFOSC.

Wake-Up Timer

Wake-up time is specified in units of seconds.

Supports alarm times down to a resolution of 30.52 µs, that is,

where the time is specified down to a specific 32 kHz clock cycle.

Number of

Alarms

One alarm only. Uses an absolute, nonrepeating

alarm time, specified in units of 1 sec.

Two alarms. One absolute alarm time and one periodic alarm,

repeating every 60 prescaled time units.

SensorStrobe

Mechanism

Not available.

Four independent channels with fine control on duty cycle and

frequency (0.5 Hz to 16.384 kHz).

SensorStrobe is an alarm function in the RTC that can send an

output pulse via GPIOs to an external device to instruct that

device to take a measurement or perform some action at a

specific time. SensorStrobe events are scheduled at a specific

target time relative to the real-time count of the RTC.

SensorStrobe can be enabled in active, flexi, and hibernate

modes.

Input Capture

Not available.

Input capture takes a snapshot of the RTC real-time count when

an external device signals an event via a transition on one of the

GPIO inputs to the ADuCM4050 MCU. Typically, an input capture

event is triggered by an autonomous measurement or action on

such a device, which then signals to the ADuCM4050 MCU that

the RTC must take a snapshot of time corresponding to the event.

Taking this snapshot can wake up the ADuCM4050 MCU and

cause an interrupt to the CPU. The CPU can subsequently obtain

information from the RTC on the exact 32 kHz cycle on which the

input capture event occurred.

Input Sampling

Not available.

Each SensorStrobe channel has up to three separate GPIO inputs

from an external device, which can be sampled based on the

output pulse sent to the external device. Each channel can be

configured to interrupt the ADuCM4050 MCU when any activity

happens on these GPIO inputs from the external device. These

inputs can broadcast sensor states such as first in, first out (FIFO)

buffer full, switch open, and threshold crossed. This feature allows

the ADuCM4050 MCU to remain in a low power state and wake

up to process the data only when a specific programmed

sequence from an external device is detected.

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