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ISL12020M View Datasheet(PDF) - Intersil

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ISL12020M Datasheet PDF : 32 Pages
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ISL12020M
• Bits 3, 4, 5 contain the Week of the Month
information that sets the week that DST starts. The
range is from 1 to 5, and Week 7 is used to indicate
the last week of the month. The default for the DST
Forward Week of the Month is 00h.
DST Date Forward
DstDtfd controls which Date DST begins. The format for
the Date is the same as for the RTC register, from 1 to
31. The default value for DST forward date is 00h.
DstDtFd is only effective if DstDwFdE = 0.
DST Hour Forward
DstHrFd controls the hour that DST begins. The RTC hour
and DstHrFd registers have the same formats except
there is no Military bit for DST hour. The user sets the
DST hour with the same format as used for the RTC hour
(AM/PM or MIL) but without the MIL bit, and the DST will
still advance as if the MIL bit were there. The default
value for DST hour Forward is 00h.
DST REVERSE REGISTERS (24H TO 27H)
DST end (reverse) is controlled by the following DST
Registers:
DST Month Reverse
DstMoRv sets the Month that DST ends. The format is
the same as for the RTC register month, from 1 to 12.
The default value for the DST end month is October
(10h).
ADDRESS FUNCTION
15h
Month
Forward
16h
Day Forward
17h
Date
Forward
18h
Hour
Forward
7
DSTE
0
0
TABLE 20. DST FORWARD REGISTERS
6
5
4
3
0
0
MoFd20 MoFd13
DwFdE
0
WkFd12
DtFd21
WkFd11
DtFd20
WkFd10
DtFd13
0
HrFd21
HrFd20
HrFd13
2
MoFd12
DwFd12
DtFd12
HrFd12
1
MoFd11
0
MoFd10
DwFd11
DtFd11
DwFd10
DtFd10
HrFd11 HrFd10
ADDRESS
NAME
7
Month
0
19h
Reverse
1Ah
Day Reverse
0
1Bh Date Reverse
0
1Ch Hour Reverse
TABLE 21. DST REVERSE REGISTERS
6
5
4
3
0
0
MoRv20 MoRv13
2
MoRv12
1
MoRv11
0
MoRv10
DwRvE
0
0
WkRv12
DtRv21
HrRv21
WkRv11
DtRv20
HrRv20
WkRv10
DtRv13
HrRv13
DwRv12
DtRv12
HrRv12
DwRv11
DtRv11
HrRv11
DwRv10
DtRv10
HrRv10
23
FN6667.4
February 11, 2010
 

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