20 FN6682.3 December 6, 2011 DST Control Registers (DSTCR) 8 bytes of control registers have been assigned for the Daylight Savings Ti" />
參數(shù)資料
型號(hào)： ISL12023IVZ
廠商： Intersil
文件頁(yè)數(shù)： 13/29頁(yè)
文件大?。?/td> 0K
描述： IC RTC/CLDR TEMP SNSR 14-TSSOP
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 960
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，夏令時(shí)，閏年，SRAM
存儲(chǔ)容量： 128B
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 2.7 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 管件
ISL12023
20
FN6682.3
December 6, 2011
DST Control Registers (DSTCR)
8 bytes of control registers have been assigned for the Daylight
Savings Time (DST) functions. DST beginning (set Forward) time
is controlled by the registers DstMoFd, DstDwFd, DstDtFd, and
DstHrFd. DST ending time (set Backward or Reverse) is controlled
by DstMoRv, DstDwRv, DstDtRv and DstHrRv.
Tables 22 and 23 describe the structure and functions of the DSTCR.
DST FORWARD REGISTERS (20H TO 23H)
DST forward is controlled by the following DST Registers:
DST Enable
DSTE is the DST Enabling Bit located in bit 7 of register 20h
(DstMoFdxx). Set DSTE = 1 will enable the DSTE function. Upon
powering up for the first time (including battery), the DSTE bit
defaults to “0”. When DSTE is set to “1” the RTC time must be at
least one hour before the scheduled DST time change for the
correction to take place. When DSTE is set to “0”, the DSTADJ bit
in the Status Register automatically resets to “0”.
DST Month Forward
DstMoFd sets the Month that DST starts. The format is the same
as for the RTC register month, from 1 to 12. The default value for
the DST begin month is 00h.
DST Day/Week Forward
DstDwFd contains both the Day of the Week and the Week of the
Month data for DST Forward control. DST can be controlled either
by actual date or by setting both the Week of the month and the
Day of the Week. DstDwFdE sets the priority of the Day/Week
over the Date. For DstDwFdE = 1, Day/Week is the priority. You
must have the correct Day of Week entered in the RTC registers
for the Day/Week correction to work properly.
Bits 0, 1, 2 contain the Day of the week information which sets
the Day of the Week that DST starts. Note that Day of the week
counts from 0 to 6, like the RTC registers. The default for the
DST Forward Day of the Week is 00h (normally Sunday).
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).
DST Day/Week Reverse
DstDwRv contains both the Day of the Week and the Week of the
Month data for DST Reverse control. DST can be controlled either
by actual date or by setting both the Week of the month and the
Day of the Week. DstDwRvE sets the priority of the Day/Week
over the Date. For DstDwRvE = 1, Day/Week is the priority. You
must have the correct Day of Week entered in the RTC registers
for the Day/Week correction to work properly.
TABLE 22. DST FORWARD REGISTERS
ADDRESS
FUNCTION
7
6
543210
20h
Month Forward
DSTE
0
MoFd20
MoFd13
MoFd12
MoFd11
MoFd10
21h
Day Forward
0
DwFdE
WkFd12
WkFd11
WkFd10
DwFd12
DwFd11
DwFd10
22h
Date Forward
0
DtFd21
DtFd20
DtFd13
DtFd12
DtFd11
DtFd10
23h
Hour Forward
0
HrFd21
HrFd20
HrFd13
HrFd12
HrFd11
HrFd10
TABLE 23. DST REVERSE REGISTERS
ADDRESS
NAME
7
6
543
210
24h
Month Reverse
0
MoRv20
MoRv13
MoRv12
MoRv11
MoRv10
25h
Day Reverse
0
DwRvE
WkRv12
WkRv11
WkRv10
DwRv12
DwRv11
DwRv10
26h
Date Reverse
0
DtRv21
DtRv20
DtRv13
DtRv12
DtRv11
DtRv10
27h
Hour Reverse
0
HrRv21
HrRv20
HrRv13
HrRv12
HrRv11
HrRv10
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