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ADE7569 Datasheet(PDF) 117 Page - Analog Devices

No. de pieza ADE7569
Descripción Electrónicos  Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
PDF  148 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADE7569 Datasheet(HTML) 117 Page - Analog Devices

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Preliminary Technical Data
ADE75xx/ADE71xx
Rev. PrE | Page 117 of 148
RTC - REAL TIME CLOCK
The ADE75XX/ADE71XX has an embedded Real Time Clock (RTC) – see Figure 75. The external 32.768 kHz crystal is used as the clock
source for the RTC. Calibration is provided to compensate the nominal crystal frequency and for variations in the external crystal
frequency over temperature. By default, the RTC is maintained active in all the Power Saving Modes. The RTC counters retain their
values through watchdog resets and external resets and are only reset during a power on reset.
8-BIT
PRESCALER
HUNDREDTHS COUNTER
HTHSEC
SECOND COUNTER
SEC
MINUTE COUNTER
MIN
HOUR COUNTER
HOUR
ITEN
ALARM EVENT
8-BIT
INTERVAL COUNTER
INTVAL SFR
INTERVAL
TIMEBASE
SELECTION
MUX
RTCEN
32.768kHz
CRYSTAL
ITS1 ITS0
EQUAL?
CALIBRATION
RTCCOMP
TEMPCAL
MIDNIGHT EVENT
CALIBRATED
32.768kHz
Figure 75: RTC implementation
RTC SFR REGISTER LIST
SFR
Address
Bit Addressable
Description
TIMECON
0xA1
No
RTC configuration
HTHSEC
0xA2
No
Hundredth of a second counter
SEC
0xA3
No
Seconds counter
MIN
0xA4
No
Minutes counter
HOUR
0xA5
No
Hours counter
INTVAL
0xA6
No
Alarm interval
RTCCOMP
0xF6
No
RTC nominal compensation



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