STLED325 datasheet(20/62 Pages) STMICROELECTRONICS

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Functional description

STLED325

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Doc ID 17576 Rev 1

3.11.2

Writing to the real time clock

The time and date may be set by writing to the RTC registers. The new RTC time can be

updated by writing to the RTC registers. The new time only takes affect after a complete

write cycle. If the write cycle is incomplete, the new time value is discarded. A single byte

may be written to the RTC without affecting the other bytes.

3.11.3

Legend:

Cal_Sign = Sign bit

OSC_ST = Oscillator Stop bit

BMB0 – BMB4 = watchdog multiplier bits

CB = Century bits

ABE = Alarm in battery back up mode enable bit

AFE = Alarm flag enable

RB0 – RB2 = watchdog resolution bits

RPT1 – RPT6 = alarm repeat mode bits

Table 2.

Addr

Functional/range BCD format

00h

Reserved

01h

OSC_S

10 seconds

Seconds

00-59

02h

Rsvd

10 minutes

Minutes

00-59

03h

MD_HM_MS

10 hours

Hours (24 hours format)

Hours

00-23

04h

Rsvd

Day of week

Day

01-7

05h

Rsvd

10 date

Day of month

Date

01-31

06h

CB1

CB0

Rsvd

10M

Month

Century/month

0-3/01-12

07h

10 years

Year

00-99

08h

12/24

Rsvd

Cal_sig

Calibration

09h

RB2

BMB4

BMB3

BMB2

BMB1

BMB0

RB1

RB0

Watchdog

0Ah

AFE

Rsvd

ABE

AI 10M

Alarm month

Al month

01-12

0Bh

RPT4

RPT5

AI 10 date

Alarm date

Al date

01-31

0Ch

RPT3

RPT6

AI 10 hour

AIarm hour

AI hour

00-23

0Dh

RPT2

Alarm 10 minutes

Alarm minutes

Al min

00-59

0Eh

RPT1

Alarm 10 seconds

Alarm seconds

Al sec

00-59

0Fh

WDFEn

Alarm: day of week

Rsvd (bypass mode)

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