PCF8563_6

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 06 — 21 February 2008

8 of 32

NXP Semiconductors

PCF8563

Real-time clock/calendar

[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.

[1]

This bit may be re-assigned by the user.

Table 8.

Minutes - Minutes register (address 03h) bit description

Bit

Symbol

Value

Description

7

x

not relevant

6 to 0

MINUTES[6:0]

00 to 59

the current minutes, coded in BCD format

Table 9.

Hours - Hours register (address 04h) bit description

Bit

Symbol

Value

Description

7 to 6

x

not relevant

5 to 0

HOURS[5:0]

00 to 23

the current hours, coded in BCD format

Table 10.

Days - Days register (address 05h) bit description

Bit

Symbol

Value

Description

7 to 6

x

not relevant

5 to 0

DAYS[5:0]

01 to 31

the current day, coded in BCD format[1]

Table 11.

Weekdays - Weekdays register (address 06h) bit description

Bit

Symbol

Value

Description

7 to 3

x

not relevant

2to0[1]

WEEKDAYS[2:0] 0 to 6

the current weekday, coded in BCD format,

see Table 12.

Table 12.

Weekday assignments

Weekday

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Sunday

xxxxx0

0

0

Monday

xxxxx0

0

1

Tuesday

xxxxx0

1

0

Wednesday

xxxxx0

1

1

Thursday

xxxxx1

0

0

Friday

xxxxx1

0

1

Saturday

xxxxx1

1

0

Table 13.

Century_months - Century and Months register (address 07h) bit description

Bit

Symbol

Value

Description

7C[1]

century; this bit is toggled when the years register

overflows from 99 to 00

0

indicates the century is 20xx

1

indicates the century is 19xx

6 to 5

x

not relevant

4 to 0

MONTHS[4:0]

01 to 12

the current month, coded in BCD format, see Table 14