Datasheet

Clock operation M48T201Y, M48T201V

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Note: It is not necessary to set the WRITE bit when setting or resetting the FREQUENCY TEST

bit (FT) or the STOP bit (ST).

Table 5. TIMEKEEPER

Keys:

S = Sign bit

FT = Frequency test bit

R = READ bit

W = WRITE bit

ST = Stop bit

0 = Must be set to '0'

WDS = Watchdog steering bit

AF = Alarm flag

BL = Battery low flag

SQWE = Square wave enable bit

BMB0-BMB4 = Watchdog multiplier bits

RB0-RB1 = Watchdog resolution bits

AFE = Alarm flag enable flag

ABE = Alarm in battery backup mode enable bit

RPT1-RPT5 = Alarm repeat mode bits

WDF = Watchdog flag

RS0-RS3 = SQW frequency

Address

Data

Function/range

BCD format

D7 D6 D5 D4 D3 D2 D1 D0

7FFFFh 10 years Year Year 00-99

7FFFEh 0 0 0 10 M Month Month 01-12

7FFFDh 0 0 10 date Date: Day of month Date 01-31

7FFFCh 0 FT 0 0 0 Day Day 01-07

7FFFBh 0 0 10 hours Hours (24-hour format) Hours 00-23

7FFFAh 0 10 minutes Minutes Minutes 00-59

7FFF9h ST 10 seconds Seconds Seconds 00-59

7FFF8h W R S Calibration Control

7FFF7h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog

7FFF6h AFE SQWE ABE Al.10M Alarm month Al. month 01-12

7FFF5h RPT4 RPT5 Al. 10 date Alarm date Al. date 01-31

7FFF4h RPT3 0 Al. 10 hours Alarm hours Al. hours 00-23

7FFF3h RPT2 Alarm 10 minutes Alarm minutes Al. minutes 00-59

7FFF2h RPT1 Alarm 10 seconds Alarm seconds Al. seconds 00-59

7FFF1h 1000 years 100 years Century 00-99

7FFF0h WDF AF 0 BL RS3 RS2 RS1 RS0 Flags