M48T37Y Datasheet, PDF (13/29 Pages) STMicroelectronics – 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM

M48T37Y, M48T37V
Table 5. Register Map
Data
Address
D7
D6
D5
D4
D3
D2
D1
D0
Function/Range
BCD Format
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
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 Back-Up 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
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