PCF8563PSLASHF4 datasheet(11/50 Pages) NXP

11 / 50 page

PCF8563

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Product data sheet

Rev. 10 — 3 April 2012

11 of 50

NXP Semiconductors

PCF8563

Real-time clock/calendar

The VL flag is intended to detect the situation when VDD is decreasing slowly, for example

under battery operation. Should the oscillator stop or VDD reach Vlow 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

8.4.3 Register Hours

8.4.4 Register Days

[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.

8.4.5 Register Weekdays

Table 10.

Minutes - minutes register (address 03h) bit description

Bit

Symbol

Value

Place value Description

unused

6 to 4 MINUTES

0 to 5

ten’s place

actual minutes coded in BCD format

3 to 0

0 to 9

unit place

Table 11.

Hours - hours register (address 04h) bit description

Bit

Symbol

Value

Place value Description

7 to 6 -

unused

5 to 4 HOURS

0 to 2

ten’s place

actual hours coded in BCD format

3to0

0to9

unit place

Table 12.

Days - days register (address 05h) bit description

Bit

Symbol

Value

Place value Description

7 to 6 -

unused

5to4 DAYS[1]

0 to 3

ten’s place

actual day coded in BCD format

3to0

0to9

unit place

Table 13.

Weekdays - weekdays register (address 06h) bit description

Bit

Symbol

Value

Description

7 to 3 -

unused

2 to 0 WEEKDAYS

0 to 6

actual weekday values, see Table 14

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