m48t37v STMicroelectronics, m48t37v Datasheet - Page 13

• Manufacturer Part Number: m48t37v
• Description: 5.0 Or 3.3v, 256 Kbit 32 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

Table 5.
KEYS:
Address
7FFEh
7FFDh
7FFCh
7FFBh
7FFFh
7FFAh
7FF9h
7FF8h
7FF7h
7FF6h
7FF5h
7FF4h
7FF3h
7FF2h
7FF1h
7FF0h
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
RPT4
RPT3
RPT2
RPT1
Register map
WDS
WDF
AFE
D7
ST
W
0
0
0
0
0
BMB4 BMB3 BMB2 BMB1 BMB0
D6
AF
FT
Alarm 10 Seconds
1000 Year
R
0
0
0
0
0
0
Alarm 10 Minutes
10 Years
10 Seconds
10 Minutes
AIarm 10 Date
ABE
D5
S
Z
0
0
10 Hours
AIarm 10
10 Date
Hours
10 M
D4
BL
0
0
Data
D3
0
0
Z
Date: Day of Month
Calibration
Alarm Seconds
Alarm Minutes
Alarm Hours
Alarm Date
D2
Z
0
Seconds
100 Year
Minutes
Month
Hours
Day of Week
Year
RB1
D1
Z
0
RB0
D0
0
Z
Alarm Date
Alarm Hour
Alarm Sec
Watchdog
Alarm Min
Interrupts
Century
Control
Function/Range
Month
Hours
Flags
Date
Year
Day
Sec
Min
BCD Format
01-31
00-59
00-59
00-59
00-99
00-99
01-12
00-23
01-31
00-23
00-59
01-7
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