Datasheet

M48T37Y, M48T37V Clock operations
Doc ID 7019 Rev 9 13/30
Table 5. Register map
Keys:
S = Sign bit
FT = Frequency test bit
R = READ bit
W = WRITE bit
ST = Stop bit
0 = Must be set to '0'
BL = Battery low flag (read only)
BMB0-BMB4 = Watchdog multiplier bits
AFE = Alarm flag enable flag
RB0-RB1 = Watchdog resolution bits
WDS = Watchdog steering bit
ABE = Alarm in battery backup mode enable bit
RPT1-RPT4 = Alarm repeat mode bits
WDF = Watchdog flag (read only)
AF = Alarm flag (read only)
Z = '0' and are read only
Address
Data
Function/range
BCD format
D7 D6 D5 D4 D3 D2 D1 D0
7FFFh 10 years Year Year 00-99
7FFEh 0 0 0 10 M Month Month 01-12
7FFDh 0 0 10 date Date: Day of month Date 01-31
7FFCh 0 FT 0 0 0 Day of week Day 01-7
7FFBh 0 0 10 hours Hours Hours 00-23
7FFAh 0 10 minutes Minutes Min 00-59
7FF9h ST 10 seconds Seconds Sec 00-59
7FF8h W R S Calibration Control
7FF7h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog
7FF6h AFE 0 ABE 0 0 0 0 0 Interrupts
7FF5h RPT4 0 AIarm 10 date Alarm date Alarm date 01-31
7FF4h RPT3 0 AIarm 10 hours Alarm hours Alarm hour 00-23
7FF3h RPT2 Alarm 10 minutes Alarm minutes Alarm min 00-59
7FF2h RPT1 Alarm 10 seconds Alarm seconds Alarm sec 00-59
7FF1h 1000 year 100 year Century 00-99
7FF0h WDF AF Z BL Z Z Z Z Flags