M41T81MY6 STMICROELECTRONICS [STMicroelectronics], M41T81MY6 Datasheet - Page 16

• Manufacturer Part Number: M41T81MY6
• Description: Serial Access Real-Time Clock with Alarms
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M41T81
Table 10. TIMEKEEPER
Keys: S = Sign Bit
16/28
Addr
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
11h
12h
13h
FT = Frequency Test Bit
ST = Stop Bit
0 = Must be set to '0'
BMB0-BMB4 = Watchdog Multiplier Bits
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
ABE = Alarm in Battery Back-up Mode Enable Bit
RPT4
RPT3
RPT2
RPT1
WDF
OUT
CEB
AFE
RS3
D7
ST
0
0
0
0
0
0
0
0
SQWE
BMB4
RPT5
RS2
D6
CB
HT
AF
FT
0.1 Seconds
0
0
0
0
0
0
10 Years
Alarm 10 Seconds
Alarm 10 Minutes
®
10 Seconds
10 Minutes
Register Map
BMB3
ABE
RS1
D5
S
0
0
0
0
0
0
AI 10 Date
AI 10 Hour
10 Hours
10 Date
Al 10M
BMB2
10M
RS0
D4
0
0
0
0
0
BMB1
D3
0
0
0
0
0
0
Hours (24 Hour Format)
Calibration
Date: Day of Month
BMB0
Alarm Seconds
Alarm Minutes
0.01 Seconds
D2
Alarm Month
0
0
0
0
0
Alarm Date
Alarm Hour
AFE = Alarm Flag Enable Flag
RB0-RB1 = Watchdog Resolution Bits
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
Seconds
Minutes
Month
Year
Day of Week
RB1
D1
0
0
0
0
0
RB0
D0
0
0
0
0
0
Watchdog
Reserved
Reserved
Reserved
Seconds
Seconds
Al Month
Century/
Minutes
Al Date
Al Hour
Control
Al Sec
Month
Al Min
Hours
Function/Range
SQW
Flags
Date
Year
Day
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