参数资料
型号: ADE7166ASTZF16
厂商: Analog Devices Inc
文件页数: 121/152页
文件大小: 0K
描述: IC ENERGY METER 1PHASE 64LQFP
标准包装: 1
输入阻抗: *
测量误差: *
电压 - 高输入/输出: *
电压 - 低输入/输出: *
电流 - 电源: *
电源电压: *
测量仪表类型: *
工作温度: *
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 托盘

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
REAL-TIME CLOCK (RTC)
The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/
ADE7569 have an embedded real-time clock (RTC) as shown in
Figure 103. The external 32.768 kHz crystal is used as the clock
source for the RTC. Calibration is provided to compensate the
RTC SFRS
Note that none of the real-time clock SFRs are bit addressable.
Table 127. Real-Time Clock SFR
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.
SFR
TIMECON
HTHSEC
SEC
MIN
Address
0xA1
0xA2
0xA3
0xA4
Description
RTC Configuration (see Table 128).
Hundredths of a Second Counter
(see Table 129).
Seconds Counter (see Table 130).
Minutes Counter (see Table 131).
32.768kHz
CRYSTAL
RTCCOMP
TEMPCAL
HOUR
INTVAL
0xA5
0xA6
Hours Counter (see Table 132).
Alarm Interval (see Table 133).
RTCCOMP
0xF6
RTC Nominal Compensation (see
CALIBRATED
32.768kHz
RTCEN
CALIBRATION
TEMPCAL
0xF7
Table 134).
RTC Temperature Compensation (see
Table 135).
Protecting the RTC from Runaway Code
8-BIT
PRESCALER
HUNDREDTHS COUNTER
HTHSEC
ITS1
ITS0
To protect the RTC from runaway code, a key must be written
to the KYREG SFR (Address, 0xC1) to obtain write access to the
interrupt pins configuration SFR (INTPR, Address 0xFF),
hundredths of a second counter SFR (HTHSEC, Address 0xA2),
seconds counter SFR (SEC, 0xA3), minutes counter SFR (MIN,
Address 0xA4), and hours counter SFR (HOUR, Address 0xA5).
KYREG should be set to 0xEA to unlock it and reset it to zero
SECOND COUNTER
SEC
INTERVAL
TIMEBASE
SELECTION
MUX
ITEN
after a timekeeping register is written to. The RTC registers can
be written using the following 8052 assembly code:
MOV
KYREG,#0EAh
MOV
INTPR,#080h
MINUTE COUNTER
MIN
HOUR COUNTER
HOUR
8-BIT
MIDNIGHT EVENT
INTERVAL COUNTER
EQUAL?
ALARM
EVENT
INTVAL SFR
Figure 103. RTC Implementation
Rev. B | Page 121 of 152
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