m48t129v STMicroelectronics, m48t129v Datasheet - Page 14

• Manufacturer Part Number: m48t129v
• Description: 5.0 Or 3.3v, 1 Mbit 128 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

M48T129Y, M48T129V
Table 5. TIMEKEEPER
Keys: S = SIGN Bit
14/30
Address
1FFFDh
1FFFCh
1FFFFh
1FFFEh
1FFFBh
1FFFAh
1FFF9h
1FFF8h
1FFF7h
1FFF6h
1FFF5h
1FFF4h
1FFF3h
1FFF2h
1FFF1h
1FFF0h
FT = FREQUENCY TEST Bit
R = READ Bit
W = WRITE Bit
ST = STOP Bit
0 = Must be set to '0'
Y = '1' or '0‘
BL = Battery Low (Read only)
RPT4
RPT3
RPT2
RPT1
WDS
WDF
AFE
D7
ST
W
0
0
0
0
0
BMB4
RPT5
D6
FT
AF
R
0
0
0
0
0
1000 Year
10 Years
®
Al 10 Seconds
Al 10 Minutes
10 Seconds
10 Minutes
Register Map
BMB3
ABE
D5
Al 10 Hours
S
Al 10 Date
0
0
0
10 Hours
10 Date
Al 10M
BMB2
10 M
D4
BL
0
Data
BMB1
D3
Y
0
Hours (24 Hour Format)
Calibration
Alarm Seconds
BMB0
Alarm Minutes
Alarm Month
Alarm Hours
D2
Alarm Date
Y
Seconds
100 Year
Minutes
Month
Date
Year
Day of Week
AF = Alarm Flag (Read only)
WDS = Watchdog Steering Bit
BMB0-BMB4 = Watchdog Multiplier Bits
RB0-RB1 = Watchdog Resolution Bits
AFE = Alarm Flag Enable
ABE = Alarm in Battery Back-up Mode Enable
RPT1-RPT5 = Alarm Repeat Mode Bits
WDF = Watchdog Flag (Read only)
RB1
D1
Y
RB0
D0
Y
Watchdog
Seconds
A Month
A Hours
Century
Minutes
Control
Al Date
Month
Hours
A Min
A Sec
Date
Year
Flag
Day
Function/Range
BCD Format
00-99
01-12
01-31
01-07
00-23
00-59
00-59
01-12
01-31
00-23
00-59
00-59
00-99