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PCF8523 Datasheet(PDF) 21 Page - NXP Semiconductors

Part # PCF8523
Description  Real-Time Clock (RTC) and calendar
PDF  66 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8523 Datasheet(HTML) 21 Page - NXP Semiconductors

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PCF8523
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 30 March 2011
21 of 66
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
8.6.5 Register Weekdays
[1]
Definition may be re-assigned by the user.
8.6.6 Register Months
Table 15.
Weekdays - weekdays register (address 07h) bit description
Bit
Symbol
Value
Description
7 to 3
-
-
unused
2to0
WEEKDAYS
0to 6
actual weekday, values see Table 16
Table 16.
Weekday assignments
Day[1]
Bit
2
1
0
Sunday
0
0
0
Monday
0
0
1
Tuesday
0
1
0
Wednesday
0
1
1
Thursday
1
0
0
Friday
1
0
1
Saturday
110
Table 17.
Months - months register (address 08h) bit description
Bit
Symbol
Value
Place value Description
7 to 5
-
-
-
unused
4
MONTHS
0 to 1
ten’s place
actual month coded in BCD
format; assignments see Table 18
3 to 0
0 to 9
unit place
Table 18.
Month assignments in BCD format
Month
Upper-digit
(ten’s place)
Digit (unit place)
Bit
Bit
4
3
2
1
0
January
0
0
0
0
1
February
0
0
0
1
0
March
0
0
0
1
1
April
00
100
May
00
101
June
00
110
July
00
111
August
01
000
September
0
1
0
0
1
October
10
000
November
10
001
December
10
010



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