NUC505-YO2G datasheet(93/130 Pages) NUVOTON

93 / 130 page

NUC505

July. 26, 2018

Page 93 of 130

Rev.1.08

Real Time Clock (RTC)

6.9

6.9.1

Overview

The Real Time Clock (RTC) block can be operated by independent power supply while the

system power is off. The RTC uses a 32.768 kHz external crystal (LXT) or internal oscillator

(LIRC), and offers programmable time tick and alarm match interrupts. The data format of time

and calendar messages are expressed in BCD format. A digital frequency compensation feature

is available to compensate the frequency accuracy of external crystal oscillator (LXT) or internal

oscillator (LIRC).

The RTC controller also offers 32 bytes spare registers to sto

re user’s important information.

The wake-up signal is used to wake the system from Idle mode, Power-down mode and Deep

Power-down mode.

6.9.2

Features



Supports real time counter in RTC_TIME (hour, minute, second) and calendar counter in

RTC_CAL (year, month, day) for RTC time and calendar check



Supports alarm time (hour, minute, second) and calendar (year, month, day) settings in

RTC_TALM and RTC_CALM



Selectable 12-hour or 24-hour time scale in RTC_CLKFMT register



Supports Leap Year indication in RTC_LEAPYEAR register



Supports Day of the Week counter in RTC_WEEKDAY register



Frequency of RTC clock source compensate by RTC_FREQADJ register



All time and calendar message expressed in BCD format



Supports periodic RTC Time Tick interrupt with 8 period interval options 1/128, 1/64, 1/32,

1/16, 1/8, 1/4, 1/2 and 1 second



Supports RTC Time Tick and Alarm Match interrupt



Supports chip wake-up from Idle mode, Power-down mode and Deep Power-down mode

while a RTC interrupt signal is generated



Supports 32 bytes spare registers and these registers values are preserved when RTC

power domain is existed

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