Datasheet
Philips Semiconductors
PCF8563
Real time clock/calendar
Product data Rev. 04 — 12 March 2004 8 of 30
9397 750 12999
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1] TF and INT become active simultaneously.
[2] n = loaded countdown value. Timer stopped when n = 0.
8.6.3 Time and date registers
[1] The PCF8563 compensates for leap years by adding a 29th day to February if the year counter contains a value which is exactly
divisible by 4, including the year 00.
[1] These bits may be re-assigned by the user.
Table 8: INT operation (bit TI/TP = 1)
Source clock (Hz) INT period (s)
[1]
n=1
[2]
n>1
4 096
1
⁄
8192
1
⁄
4096
64
1
⁄
128
1
⁄
64
1
1
⁄
64
1
⁄
64
1
⁄
60
1
⁄
64
1
⁄
64
Table 9: Seconds/VL (address 02H) bits description
Bit Symbol Value Description
7 VL 0 clock integrity is guaranteed
1 integrity of the clock information is no longer guaranteed
6 to 0 seconds 00 to 59 this register holds the current seconds coded in BCD format; example: seconds
register contains x101 1001 = 59 seconds
Table 10: Minutes (address 03H) bits description
Bit Symbol Value Description
6 to 0 minutes 00 to 59 this register holds the current minutes coded in BCD format
Table 11: Hours (address 04H) bits description
Bit Symbol Value Description
5 to 0 hours 00 to 23 this register holds the current hours coded in BCD format
Table 12: Days (address 05H) bits description
Bit Symbol Value Description
5 to 0 days
[1]
01 to 31 this register holds the current day coded in BCD format
Table 13: Weekdays (address 06H) bits description
Bit Symbol Value Description
2 to 0 weekdays
[1]
0 to 6 this register holds the current weekday coded in BCD format, see Table 1 4
Table 14: Weekday assignments
Day Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Sunday xxxxx000
Monday xxxxx001
Tuesday xxxxx010
Wednesday xxxxx011