ISL12023IVZ【PDF 13/29 页】IC RTC/CLDR TEMP SNSR 14-TSSOP

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ISL12023

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

543210

20h

Month Forward

DSTE

MoFd20

MoFd13

MoFd12

MoFd11

MoFd10

21h

Day Forward

DwFdE

WkFd12

WkFd11

WkFd10

DwFd12

DwFd11

DwFd10

22h

Date Forward

DtFd21

DtFd20

DtFd13

DtFd12

DtFd11

DtFd10

23h

Hour Forward

HrFd21

HrFd20

HrFd13

HrFd12

HrFd11

HrFd10

TABLE 23. DST REVERSE REGISTERS

ADDRESS

NAME

543

210

24h

Month Reverse

MoRv20

MoRv13

MoRv12

MoRv11

MoRv10

25h

Day Reverse

DwRvE

WkRv12

WkRv11

WkRv10

DwRv12

DwRv11

DwRv10

26h

Date Reverse

DtRv21

DtRv20

DtRv13

DtRv12

DtRv11

DtRv10

27h

Hour Reverse

HrRv21

HrRv20

HrRv13

HrRv12

HrRv11

HrRv10

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