PCF2123TS datasheet(14/63 Pages) NXP

14 / 63 page

PCF2123

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Product data sheet

Rev. 5 — 27 April 2011

14 of 63

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

8.4.4 Register Days

[1]

The PCF2123 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

[1]

Definition may be re-assigned by the user.

8.4.6 Register Months

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

0to 9

unit place

Table 13.

Weekdays - weekdays register (address 06h) bit description

Bit

Symbol

Value

Description

7 to 3

unused

2to0

WEEKDAYS

0to 6

actual weekday values, see Table 14

Table 14.

Weekday assignments

Day[1]

Bit

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

110

Table 15.

Months - months register (address 07h) bit description

Bit

Symbol

Value

Place value Description

7 to 5

unused

MONTHS

0 to 1

ten’s place

actual month coded in BCD

format, see Table 16

3 to 0

0 to 9

unit place

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