TPS65910, TPS65910A, TPS65910A3, TPS659101, TPS659102, TPS659103
TPS659104, TPS659105, TPS659106, TPS659107, TPS659108, TPS659109
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SWCS046N –MARCH 2010–REVISED APRIL 2012
VRTC
32 kHz to
digital block
Biasing
and
amplitude
control
OSC32KIN
REFGND OSC32KOUT
Q
Coscin
Coscout
SWCS046-013
Figure 15. Crystal Oscillator 32-kHz Clock
RTC
The RTC, which is driven by the 32-kHz clock, provides the alarm and timekeeping functions. The RTC is kept
supplied when the device is in the OFF or the BACKUP state.
The main functionalities of the RTC block are:
•
•
•
Time information (seconds/minutes/hours) directly in binary-coded decimal (BCD) format
Calendar information (Day/Month/Year/Day of the week) directly in BCD code up to year 2099
Programmable interrupts generation: The RTC can generate two interrupts:
a
timer interrupt
RTC_PERIOD_IT periodically (1s/1m/1h/1d period) and an alarm interrupt RTC_ALARM_IT at a precise time
of the day (alarm function). These interrupts are enabled using IT_ALARM and IT_TIMER control bits.
Periodically interrupts can be masked during the SLEEP period to avoid host interruption and are
automatically unmasked after SLEEP wakeup (using the IT_SLEEP_MASK_EN control bit).
•
Oscillator frequency calibration and time correction
Copyright © 2010–2012, Texas Instruments Incorporated
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TPS659105 TPS659106 TPS659107 TPS659108 TPS659109
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