m41t66 STMicroelectronics, m41t66 Datasheet - Page 15

• Manufacturer Part Number: m41t66
• Description: Real-time Clocks
• Manufacturer: STMicroelectronics

M41T66
Table 2.
1. Keys:
Addr
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0 = must be set to '0'
AF = alarm flag (read only)
AFE = alarm flag enable flag
BMB0 - BMB4 = watchdog multiplier bits
CB0-CB1 = century bits
OF = oscillator fail bit
OFIE = oscillator fail interrupt enable bit
OUT = output level
RB0 - RB2 = watchdog resolution bits
RPT1-RPT5 = alarm repeat mode bits
RS0-RS3 = SQW frequency bits
S = sign bit
SQWE = square wave enable bit
ST = stop bit
WDF = watchdog flag bit (read only)
RPT4
RPT3
RPT2
RPT1
OFIE
WDF
OUT
RS3
CB1
RB2
AFE
D7
ST
0
0
M41T66 register map
SQWE
BMB4 BMB3
RPT5
RS2
CB0
D6
0.1 seconds
AF
0
0
0
0
Alarm 10 seconds
Alarm 10 minutes
10 years
10 seconds
10 minutes
RS1
D5
0
S
0
0
AI 10 hour
AI 10 date
10 hours
10 date
Al 10M
BMB2
RS0
10M
D4
0
(1)
BMB1 BMB0
D3
0
0
Hours (24 hour format)
Calibration
Date: day of month
Alarm seconds
Alarm minutes
0.01 seconds
Alarm month
Alarm date
Alarm hour
OF
D2
Seconds
Minutes
Month
Year
Day of week
RB1
D1
0
RB0
D0
0
10ths/100ths
of seconds
Calibration
Function/range BCD
Watchdog
Al month
Seconds
Century/
Minutes
Al date
Al hour
month
Al min
Al sec
Hours
Flags
Date
Year
Day
Clock operation
format
0-3/01-12
00-99
00-59
00-59
00-23
01-31
00-99
01-12
01-31
00-23
00-59
00-59
01-7
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