PCF8563 datasheet(8/30 Pages) PHILIPS

8 / 30 page

Philips Semiconductors

PCF8563

Real-time clock/calendar

Product speciﬁcation

16 April 1999

8 of 30

9397 750 04855

8.6.3

Seconds, Minutes and Hours registers

8.6.4

Days, Weekdays, Months/Century and Years registers

Table 10: Seconds/VL register bits description (address 02H)

Bit

Symbol

Description

VL = 0: reliable clock/calendar information is guaranteed;

VL = 1: reliable clock/calendar information is no longer

guaranteed.

6 to 0

These bits represent the current seconds value coded in BCD

format; value = 00 to 59.

Example: <seconds> = 101 1001, represents the value 59 s.

Table 11: Minutes register bits description (address 03H)

Bit

Symbol

Description

−

not implemented

6 to 0

These bits represent the current minutes value coded in BCD

format; value = 00 to 59.

Table 12: Hours register bits description (address 04H)

Bit

Symbol

Description

7 to 6

−

not implemented

5 to 0

<hours>

These bits represent the current hours value coded in BCD format;

value=00to23.

Table 13: Days register bits description (address 05H)

Bit

Symbol

Description

7 to 6

−

not implemented

5 to 0

<days>

These bits represent the current day value coded in BCD format;

value = 01 to 31.

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’.

Table 14: Weekdays register bits description (address 06H)

Bit

Symbol

Description

7 to 3

−

not implemented

2 to 0

These bits represent the current weekday value 0 to 6;

see Table 15.

These bits may be re-assigned by the user.

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