PCF8563 datasheet(9/30 Pages) PHILIPS

9 / 30 page

Philips Semiconductors

PCF8563

Real-time clock/calendar

Product speciﬁcation

16 April 1999

9 of 30

9397 750 04855

Table 15: Weekday assignments

Day

Bit 2

Bit 1

Bit 0

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Table 16: Months/Century register bits description (address 07H)

Bit

Symbol

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.

6to5

−

not implemented

4 to 0

<months> These bits represents the current month value coded in BCD format;

value = 01 to 12; see Table 17.

Table 17: Month assignments

Month

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

January

00001

February

00010

March

00011

April

00100

May

00101

June

00110

July

00111

August

01000

September

01001

October

10000

November

10001

December

10010

Table 18: Years register bits description (address 08H)

Bit

Symbol

Description

7 to 0

<years>

This register represents the current year value coded in BCD

format; value = 00 to 99.

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