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NUC100-RB2C Datasheet(Fiches technique) 75 Page - Nuvoton Technology Corporation

Numéro de pièce NUC100-RB2C
Description  ARM® Cortex®-M 32-bit Microcontroller
Télécharger  107 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
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 75 page
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NUC100/120xxxDN
Aug 31, 2015
Page 75 of 107
Rev 1.01
Real Time Clock (RTC)
6.13
6.13.1
Overview
The Real Time Clock (RTC) controller provides user with the real time and calendar message.
The clock source of RTC controller is from an external 32.768 kHz low speed crystal which
connected at pins X32I and X32O (refer to pin Description) or from an external 32.768 kHz low
speed oscillator output fed at pin X32I. The RTC controller provides the real time message (hour,
minute, second) in TLR (RTC Time Loading Register) as well as calendar message (year, month,
day) in CLR (RTC Calendar Loading Register). It also offers RTC alarm function that user can
preset the alarm time in TAR (RTC Time Alarm Register) and alarm calendar in CAR (RTC
Calendar Alarm Register). The data format of RTC time and calendar message are all expressed
in BCD format.
The RTC controller supports periodic RTC Time Tick and Alarm Match interrupts. The periodic
RTC Time Tick interrupt has 8 period interval options 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2 and 1
second which are selected by TTR (TTR[2:0] Time Tick Register). When real time and calendar
message in TLR and CLR are equal to alarm time and calendar settings in TAR and CAR, the AIF
(RIIR [0] RTC Alarm Interrupt Flag) is set to 1 and the RTC alarm interrupt signal is generated if
the AIER (RIER [0] Alarm Interrupt Enable) is enabled.
Both RTC Time Tick and Alarm Match interrupt signal can cause chip to wake-up from Idle or
Power-down mode if the correlate interrupt enable bit (AIER or TIER) is set to 1 before chip
enters Idle or Power-down mode.
6.13.2
Features
Supports real time counter in TLR (hour, minute, second) and calendar counter in CLR (year,
month, day) for RTC time and calendar check
Supports alarm time (hour, minute, second) and calendar (year, month, day) settings in TAR
and CAR
Selectable 12-hour or 24-hour time scale in TSSR register
Supports Leap Year indication in LIR register
Supports Day of the Week counter in DWR register
Frequency of RTC clock source compensate by FCR 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




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