ISL12020 Datasheet, PDF(19/25 Page) Intersil Corporation – Low Power RTC with VDD Battery Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving

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ISL12020 Datasheet, PDF (19/25 Pages) Intersil Corporation – Low Power RTC with VDD Battery Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving

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ISL12020

and DstHrFd. DST ending time is controlled by DstMoRv,

DstDwRv, DstDtRv and DstHrRv.

The following tables describe the structure and functions of

the DSTCR.

DST FORWARD REGISTERS (20H TO 23H)

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 â0â.

The beginning of DST is controlled by the following DST

Registers.

DstMoFd sets the Month that DST starts. The default value

for the DST begin month is April (04h).

DstDw sets the Day of the Week that DST starts. DstDwFdE

sets the priority of the Day of the Week over the Date. For

DstDwFdE=1, Day of the week is the priority. Note that Day

of the week counts from 0 to 6, like the RTC registers.

two registers need to match formats (Military or AM/PM) in

order for the DST function to work. The default value for DST

hour is 2:00AM. The time is advanced from 2:00:00AM to

3:00:00AM for this setting.

DST REVERSE REGISTERS (24H TO 27H)

The end of DST is controlled by the following DST Registers.

DstMoRv sets the Month that DST ends. The default value

for the DST end month is October (10h).

DstDwRv controls which count of the Day of the Week that

DST should end. DstDwRvE sets the priority of the Day of the

Week over the Date. For DstDwRvE = 1, Day of the week is

the priority. Note that Day of the week counts from 0 to 6, like

the RTC registers.

The default for DST end is Sunday (80h).

DstDtRv controls which Date DST ends. The default value

DST is set to end is the first date of the month. The DstDtRv

is only effective if the DstDwRvE = 0.

The default for the DST Forward Day of the Week is Sunday

(80h).

DstDtfd control which Date DST begins. The defaulted value

for DST date is on the first date of the month. DstDtFd is only

effective if DstDwFdE = 0.

DstHrFd controls the hour that DST begins. It includes the

MIL bit which is in the corresponding RTC register. These

DstHrRv controls the hour that DST ends. It includes the MIL

bit which is in the corresponding RTC register. These two

registers need to match formats (Military or AM/PM) in order

for the DST function to work. The default value sets the DST

end at 2:00AM. The time is set back from 2:00:00AM to

1:00:00AM for this setting.

TABLE 20. DST FORWARD REGISTERS

Name

DstMoFd

DSTE

Not Used

Not Used DstMoFd20 DstMoFd13 DstMoFd12 DstMoFd11 DstMoFd10

DstDwFd

DstDwFdE

Not Used

Not Used DstDwFd12 DstDwFd11 DstDwFd10

DstDtFd

Not Used

Not Used DstDtFd21 DstDtFd20 DstDtFd13 DstDtFd12 DstDtFd11 DstDtFd10

DstHrFd

MIL

Not Used DstHrFd21 DstHrFd20 DstHrFd13 DstHrFd12 DstHrFd11 DstHrFd10

Name

DstMoRv

DstDwRv

DstDtRv

DstHrRv

Not Used

DstDwRvE

Not Used

MIL

Not Used

TABLE 21. DST REVERSE REGISTERS

Not Used DstMoRv20 DstMoRv13

Not Used

DstDtRv21 DstDtRv20 DstDtRv13

DstHrRv21 DstHrRv20 DstHrRv13

DstMoRv12

DstDwRv12

DstDtRv12

DstHrRv12

DstMoRv11

DstDwRv11

DstDtRv11

DstHrRv11

DstMoRv10

DstDwRv10

DstDtRv10

DstHrRv10

FN6450.0

March 29, 2007

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