PCF2123TS datasheet(14/55 Pages) NXP

14 / 55 page

PCF2123_2

Product data sheet

Rev. 02 — 4 December 2009

14 of 55

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

[1]

Hour mode is set by the 12_24 bit in register Control_1.

9.6.4 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.

9.6.5 Register Weekdays

[1]

Deﬁnition may be re-assigned by the user.

9.6.6 Register Months

24 hour mode[1]

5 to 4 HOURS

0 to 2

ten’s place

actual hours in 24 hour mode coded in BCD format

3 to 0

0 to 9

unit place

Table 11.

Hours - hours register (address 04h) bit description …continued

Bit

Symbol

Value

Place value Description

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

3 to 0

0 to 9

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

Table 14.

Weekday assignments

Day[1]

Bit

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

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

PCF2123TS датащи(PDF) 14 Page - NXP Semiconductors

PCF2123TS датащи(HTML) 14 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

датащи скачать

ссылки URL