M263 datasheet(308/398 Pages) NUVOTON

308 / 398 page

M261/M262/M263

Mar 25, 2020

Page 308 of 398

Rev 1.02

6.11

Real Time Clock (RTC)

6.11.1

Overview

The Real Time Clock (RTC) controller provides the real time and calendar message. The RTC 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

external crystal oscillator frequency accuracy.

6.11.2

Features



Supports external power pin VBAT.



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.



Supports alarm time (hour, minute, second) and calendar (year, month, day) mask enable

in RTC_TAMSK and RTC_CAMSK.



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



Optional support 1/128 second HZCNT in RTC_TIME and RTC_TALM.



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 or Power-down mode while a RTC interrupt signal is

generated.



Supports Daylight Saving Time software control in RTC_DSTCTL.



Supports up 3 pairs dynamic loop tamper pin or 6 individual tamper pin.



Built-in LXT frequency monitor .



Supports 80 bytes spare registers and tamper pins detection to clear the content of these

spare registers.



Supports Flash mass erase operate will also clear the 80 bytes spare registers content.

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