m41st85w STMicroelectronics, m41st85w Datasheet - Page 20

• Manufacturer Part Number: m41st85w
• Description: 3.0/3.3v I 2c Combination Serial Rtc, Nvram Supervisor And Microprocessor Supervisor
• Manufacturer: STMicroelectronics

Table 2.
KEYS:
20/41
Address
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
11h
12h
13h
RPT4
RPT3
RPT2
RPT1
WDS
WDF
TIMEKEEPER
OUT
CEB
AFE
RS3
D7
ST
TR
0
0
0
0
0
0
FT = Frequency Test Bit
ST = Stop Bit
0 = Must be set to zero
BL = Battery Low Flag (Read only)
BMB0-BMB4 = Watchdog Multiplier Bits
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
AFE = Alarm Flag Enable Flag
RB0-RB1 = Watchdog Resolution Bits
WDS = Watchdog Steering Bit
ABE = Alarm in Battery Back-Up Mode Enable Bit
RPT1-RPT5 = Alarm Repeat Mode Bits
WDF = Watchdog flag (Read only)
AF = Alarm flag (Read only)
SQWE = Square Wave Enable
RS0-RS3 = SQW Frequency
HT = Halt Update Bit
TR = t
S = Sign Bit
SQWE
BMB4
RPT5
RS2
0.1 Seconds
CB
D6
HT
AF
FT
0
0
0
0
0
0
Alarm 10 Seconds
10 Years
Alarm 10 Minutes
rec
10 Seconds
10 Minutes
Bit
®
BMB3
ABE
RS1
register map
D5
AI 10 Hour
S
AI 10 Date
0
0
0
0
0
0
10 Hours
10 Date
Al 10M
BMB2
10M
RS0
D4
BL
0
0
0
0
Data
BMB1
D3
0
0
0
0
0
0
Hours (24 Hour Format)
Calibration
Date: Day of Month
Alarm Seconds
BMB0
Alarm Minutes
0.01 Seconds
Alarm Month
D2
Alarm Hour
Alarm Date
0
0
0
0
0
Seconds
Minutes
Month
Year
Day of Week
RB1
D1
0
0
0
0
0
RB0
D0
0
0
0
0
0
Century/Hours
Watchdog
Reserved
Reserved
Reserved
Seconds
Al Month
Seconds
Minutes
Al Date
Al Hour
Control
Month
Al Sec
Al Min
SQW
Date
Flags
Year
Day
Function/range
BCD format
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-12
01-31
00-23
00-59
00-59
01-7