Philips Semiconductors
PCF8563
Real-time clock/calendar
Table 15: Weekday assignments
Day
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Bit 2
0
0
0
0
1
1
1
Bit 1
0
0
1
1
0
0
1
Bit 0
0
1
0
1
0
1
0
Table 16: Months/Century register bits description (address 07H)
Bit
7
Symbol
C
Description
Century bit. C = 0; indicates the century is 20xx.
C = 1; indicates the century is 19xx. ‘xx’ indicates the value held in the
Years register; see
Table 18.
This bit is toggled when the Years register overflows from 99 to 00.
These bits may be re-assigned by the user.
6 to 5
4 to 0
−
not implemented
<months> These bits represents the current month value coded in BCD format;
value = 01 to 12; see
Table 17.
Table 17: Month assignments
Month
January
February
March
April
May
June
July
August
September
October
November
December
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
Table 18: Years register bits description (address 08H)
Bit
7 to 0
Symbol
<years>
Description
This register represents the current year value coded in BCD
format; value = 00 to 99.
9397 750 04855
© Philips Electronics N.V. 1999. All rights reserved.
Product specification
16 April 1999
9 of 30
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