参数资料
型号: ADE7518ASTZF16
厂商: Analog Devices Inc
文件页数: 100/128页
文件大小: 0K
描述: IC ENERGY METER MCU 16K 64LQFP
产品变化通告: Product Discontinuance 27/Oct/2011
特色产品: ADE7518: Single-phase Energy-Measurement IC
标准包装: 160
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
产品目录页面: 797 (CN2011-ZH PDF)

ADE7518
REAL-TIME CLOCK
The ADE7518 has 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
RTC REGISTERS
Note that all the real-time clock SFRs are not bit addressable.
Table 108. Real-Time Clock SFR
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
Address
0xA1
0xA2
0xA3
Description
RTC Configuration (see Table 109).
Hundredths of a Second Counter
(see Table 110).
Seconds Counter (see Table 111).
32.768kHz
CRYSTAL
RTCCOMP
TEMPCAL
MIN
HOUR
0xA4
0xA5
Minutes Counter (see Table 112).
Hours Counter (see Table 113).
INTVAL
0xA6
Alarm Interval (see Table 114).
CALIBRATED
32.768kHz
RTCEN
CALIBRATION
RTCCOMP
TEMPCAL
0xF6
0xF7
RTC Nominal Compensation
(see Table 115).
RTC Temperature Compensation
(see Table 116).
8-BIT
PRESCALER
HUNDREDTHS COUNTER
HTHSEC
ITS1
ITS0
Protecting the RTC from Runaway Code
To protect the RTC from runaway code, a key must be written
to the KYREG register to obtain write access to the Interrupt
Pins Configuration SFR (INTPR, 0xFF), Hundredths of a
Second Counter SFR (HTHSEC, 0xA2), Seconds Counter SFR
(SEC, 0xA3), Minutes Counter SFR (MIN, 0xA4), and Hours
Counter SFR (HOUR, 0xA5). KYREG should be set to 0xEA to
SECONDS COUNTER
SEC
MINUTES COUNTER
MIN
HOURS COUNTER
HOUR
8-BIT
INTERVAL COUNTER
INTERVAL
TIMEBASE
SELECTION
MUX
MIDNIGHT EVENT
EQUAL?
ITEN
ALARM
EVENT
unlock it and reset it to zero 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
INTVAL SFR
Figure 88. RTC Implementation
Rev. 0 | Page 100 of 128
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