FN6659 datasheet(22/32 Pages) RENESAS

22 / 32 page

ISL12022

FN6659 Rev.3.01

Page 22 of 32

Oct 24, 2019

Time Stamp VDD to Battery Registers (TSV2B)

The TSV2B Register bytes are identical to the RTC register bytes,

except they do not extend beyond the Month. The Time Stamp

captures the FIRST VDD to Battery Voltage transition time, and will

not update upon subsequent events, until cleared (only the first

event is captured before clearing). Set CLRTS = 1 to clear this

Note that the time stamp registers are cleared to all “0”,

including the month and day, which is different from the RTC and

alarm registers (those registers default to 01h). This is the

indicator that no time stamping has occurred since the last clear

or initial power-up. Once a time stamp occurs, there will be a non-

zero time stamp.

Time Stamp Battery to VDD Registers (TSB2V)

The Time Stamp Battery to VDD Register bytes are identical to

the RTC register bytes, except they do not extend beyond Month.

The Time Stamp captures the LAST transition of VBAT to VD (only

the last event of a series of power-up/down events is retained).

Set CLRTS = 1 to clear this register (Add 09h, PWR_VDD register).

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 20 and 21 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.

TABLE 20. DST FORWARD REGISTERS

ADDRESS

FUNCTION

321

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 21. DST REVERSE REGISTERS

ADDRESS

NAME

654

321

24h

Month Reverse

MoRv20MoRv13

MoRv12MoRv11MoRv10

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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