NXP Semiconductors
PCF8563
Real-time clock/calendar
The VL flag is intended to detect the situation when V
DD
is decreasing slowly, for example
under battery operation. Should the oscillator stop or V
DD
reach V
low
before power is
re-asserted, then the VL flag is set. This will indicate that the time may be corrupted.
8.4.2 Register Minutes
Table 10.
Bit
7
3 to 0
-
Minutes - minutes register (address 03h) bit description
Value
-
0 to 5
0 to 9
Place value Description
-
ten’s place
unit place
unused
actual minutes coded in BCD format
Symbol
6 to 4 MINUTES
8.4.3 Register Hours
Table 11.
Bit
7 to 6 -
5 to 4 HOURS
3 to 0
Hours - hours register (address 04h) bit description
Value
-
0 to 2
0 to 9
Place value Description
-
ten’s place
unit place
unused
actual hours coded in BCD format
Symbol
8.4.4 Register Days
Table 12.
Bit
7 to 6 -
5 to 4 DAYS
[1]
3 to 0
[1]
Days - days register (address 05h) bit description
Value
-
0 to 3
0 to 9
Place value Description
-
ten’s place
unit place
unused
actual day coded in BCD format
Symbol
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.
8.4.5 Register Weekdays
Table 13.
Bit
7 to 3 -
2 to 0 WEEKDAYS
Weekdays - weekdays register (address 06h) bit description
Value
-
0 to 6
Description
unused
actual weekday values, see
Table 14
Symbol
PCF8563
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 10 — 3 April 2012
11 of 50
PHILIPS [ NXP SEMICONDUCTORS ]
