PCF8563
NXP Semiconductors
Real-time clock/calendar
Table 14. Weekday assignments
Day[1]
Bit
2
1
0
0
1
1
0
0
1
0
0
1
0
1
0
1
0
Sunday
0
Monday
Tuesday
Wednesday
Thursday
Friday
0
0
0
1
1
Saturday
1
[1] Definition may be re-assigned by the user.
8.4.6 Register Century_months
Table 15. Century_months - century flag and months register (address 07h) bit description
Bit
Symbol
Value
Place value Description
7
C[1]
0[2]
-
indicates the century is x
1
-
indicates the century is x + 1
unused
6 to 5 -
-
-
4
MONTHS 0 to 1
0 to 9
ten’s place
unit place
actual month coded in BCD format, see Table 16
3 to 0
[1] This bit may be re-assigned by the user.
[2] This bit is toggled when the register Years overflows from 99 to 00.
Table 16. Month assignments in BCD format
Month
Upper-digit
(ten’s place)
Digit (unit place)
Bit 4
0
Bit 3
0
Bit 2
Bit 1
0
Bit 0
1
January
February
March
0
0
0
1
1
1
1
0
0
0
0
0
0
0
1
0
0
0
1
1
April
0
0
0
0
May
0
0
0
1
June
0
0
1
0
July
0
0
1
1
August
September
October
November
December
0
1
0
0
0
1
0
1
1
0
0
0
1
0
0
1
1
0
1
0
PCF8563
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 10 — 3 April 2012
12 of 50
NXP [ NXP ]
