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M41TC8025AMC5F датащи(PDF) 15 Page - STMicroelectronics

номер детали M41TC8025AMC5F
подробное описание детали  Highly accurate, temperature-compensated serial real-time clock (RTC) with embedded crystal
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41TC8025AMC5F датащи(HTML) 15 Page - STMicroelectronics

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M41TC8025
Operation
2.4
Clock and calendar
The M41TC8025 incorporates an accurate temperature-compensated real-time clock and
calendar. The user can access at registers 00h to 06h.
2.4.1
Clock registers configuration
The clock counters count seconds, minutes, and hours. The data is in BCD format. For
example, the "seconds" register value "0101 1001" indicates 59 seconds.
The seconds and minutes counters count from "00" to "01", "02" and up to "59" and they roll
over to "00" after that.
The hours counter counts from "00" to "01", "02" and up to "23" and it rolls over to "00" after
that.
Note:
Writing invalid time data may interfere with normal operation of the clock counter.
2.4.2
Calendar registers configuration
In the day-of-week register, each bit (from bit 0 to bit 6) represents a different day of the
week.
The day-of-week data values sequence is as follows: Day 01h
 Day 02h  Day 04h 
Day 08h
 Day 10h  Day 20h  Day 40h  Day 01h  Day 02h, etc. The possible
configuration in the Day-of-week register is in Table 7 .
Table 5. Clock counters (00h to 02h)
Address
Function
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
00h
Seconds
0
40
20
10
8
4
2
1
01h
Minutes
0
40
20
10
8
4
2
1
02h
Hours
0
0
20
10
8
4
2
1
Table 6. Calendar counters (03h to 06h)
Address
Function
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
03h
Day-of-week
0
6
5
4321
0
04h
Date (day of month)
0
0
20
10
8
4
2
1
05h
Month
0
0
0
10
8
4
2
1
06h
Year
80
40
20
10
8
4
2
1
Obsolete
Product(s)
- Obsolete
Product(s)



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