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ADE7169F16 データシート(PDF) 115 Page - Analog Devices

部品番号 ADE7169F16
部品情報  Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
PDF  140 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADE7169F16 データシート(HTML) 115 Page - Analog Devices

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Preliminary Technical Data
ADE7169F16
Rev. PrD | Page 115 of 140
(TIMECON, 0xA1) to ensure that the RTC is stopped before
writing the counter registers. Then the RTC should be started
again by setting the RTCEN bit. Note that it takes up to two 32
kHz clock periods to update the RTC counter SFRs. This can be
accomplished using the following 8052 assembly code where
the current time is held in R0 through R3.
SetupRTC:
MOV
TIMECON,#040h
; stop the RTC
; wait at least one 32 kHz clock period (30.5us)
MOV
TCON, #03h
; TL0 is an 8-bit timer
MOV
TL0,#00h
; waits 62.5us at 4.096MHz
CLR
TF0
; clear overflow flag
SETB
TR0
; start Timer0
Timeout:
JNZ
TF0, Timeout
MOV
HTHSEC, R0
; using Bank 0
MOV
SEC, R1
MOV
MIN, R2
MOV
HOUR, R3
MOV
TIMECON, #041h ; start the RTC



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