ADE7566ASTZF8-RL2 AD [Analog Devices], ADE7566ASTZF8-RL2 Datasheet - Page 107

• Manufacturer Part Number: ADE7566ASTZF8-RL2
• Description: Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
REAL TIME CLOCK
The ADE7566/ADE7569 have an embedded real time clock
(RTC) as shown in Figure 88. 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 power-saving modes. The RTC
counters retain their values through watchdog resets and
external resets. They are only reset during a power-on reset.
RTC SFR REGISTER LIST
Table 115. Real Time Clock SFR
SFR
TIMECON
HTHSEC
SEC
MIN
HOUR
INTVAL
RTCCOMP
TEMPCAL
Address
0xA1
0xA2
0xA3
0xA4
0xA5
0xA6
0xF6
0xF7
Bit Addressable
No
No
No
No
No
No
No
No
Rev. PrA | Page 107 of 136
CALIBRATED
32.768kHz
Description
RTC Configuration (see Table 116).
Hundredths of a Second Counter (see Table 117).
Seconds Counter (see Table 118).
Minutes Counter (see Table 119).
Hours Counter (see Table 120).
Alarm Interval (see Table 121).
RTC Nominal Compensation (see Table 122).
RTC Temperature Compensation (see Table 123).
HUNDREDTHS COUNTER
INTERVAL COUNTER
SECOND COUNTER
MINUTE COUNTER
HOUR COUNTER
PRESCALER
INTVAL SFR
32.768kHz
CRYSTAL
HTHSEC
HOUR
8-BIT
8-BIT
SEC
MIN
RTCEN
Figure 88. RTC Implementation
RTCCOMP
CALIBRATION
EQUAL?
ADE7566/ADE7569
TEMPCAL
MIDNIGHT EVENT
SELECTION
ITS1
TIMEBASE
INTERVAL
MUX
ITS0
ALARM
EVENT
ITEN