NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 322

• Manufacturer Part Number: NUMICRO-SDK
• Description: KIT EVAUATION NUC100/120/130/140
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUMICRO-SDK

• Contents: Board, Cable, CD, Nu-Link
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100, NUC120, NUC130, NUC140

5.8
5.8.1
5.8.2
Real Time Clock (RTC) controller provides user the real time and calendar message. The clock
source of RTC is from an external 32.768 kHz crystal connected at pins X32I and X32O
(reference to pin descriptions) or from an external 32.768 kHz oscillator output fed at pin X32I.
The RTC controller provides the time message (second, minute, hour) in Time Loading Register
(TLR) as well as calendar message (day, month, year) in Calendar Loading Register (CLR). The
data message is expressed in BCD format. It also offers alarm function that user can preset the
alarm time in Time Alarm Register (TAR) and alarm calendar in Calendar Alarm Register (CAR).
The RTC controller supports periodic Time Tick and Alarm Match interrupts. The periodic interrupt
has 8 period 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]). When RTC counter in TLR and CLR is equal to alarm setting time registers TAR
and CAR, the alarm interrupt flag (RIIR.AIF) is set and the alarm interrupt is requested if the alarm
interrupt is enabled (RIER.AIER=1). The RTC Time Tick if Wakeup CPU function is enabled
(TWKE (TTR[3])=1) and Alarm Match can cause CPU wakeup from sleep or power-down mode.
Real Time Clock (RTC)
Overview
Features
There is a time counter (second, minute, hour) and calendar counter (day, month, year) for
user to check the time
Alarm register (second, minute, hour, day, month, year)
12-hour or 24-hour mode is selectable
Leap year compensation automatically
Day of week counter
Frequency compensate register (FCR)
All time and calendar message is expressed in BCD code
Support periodic time tick interrupt with 8 period options 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2
and 1 second
Support RTC Time Tick and Alarm Match interrupt
Support wake up CPU from sleep or power-down mode
NuMicro™ NUC100 Series Technical Reference Manual
- 322 -
Publication Release Date: Dec. 22, 2010
Revision V1.06