PCA2125 datasheet(10/40 Pages) NXP

Part #	PCA2125

Description	SPI Real time clock / calendar

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Manufacturer	NXP [NXP Semiconductors]

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PCA2125_00

Preliminary data sheet

Rev. 00.11 — 30 January 2007

10 of 40

NXP Semiconductors

PCA2125

SPI Real time clock / calendar

6.4 Time and date function

The majority of these registers are coded in the Binary Coded Decimal format. BCD is

used to simplify application use.

An example is shown for the minutes register:

[1]

Hour mode is set by the 12 / 24 bit in control register 2.

Table 9:

BCD example

Minutes

value in

decimal

Bit 7

23

Bit 6

22

Bit 5

21

Bit 4

20

Bit 3

23

Bit 2

22

Bit 1

21

Bit 0

20

00

0000

01

0000

0001

02

0000

0010

:

09

0000

1001

10

0001

0000

:

58

0101

1000

59

0101

1001

Table 10.

Seconds / RF (address 02HEX) bits description

Bit

Symbol

Value

Description

7

RF

0

clock integrity is guaranteed

1

clock integrity is not guaranteed. Chip reset has

occurred since flag was last cleared

6 to 0

seconds

00 to 59

this register holds the current seconds coded in BCD

format;

Table 11.

Minutes (address 03HEX) bits description

Bit

Symbol

Value

Description

6 to 0

minutes

00 to 59

this register holds the current minutes coded in BCD

format

Table 12.

Hours (address 04HEX) bits description

Bit

Symbol

Value

Description

12 hour mode

[1]

5

AMPM

0

Indicates AM

1

Indicates PM

4 to 0

hours

00 to012

this register holds the current hours coded in BCD

format for 12 hour mode

24 hour mode

[1]

5 to 0

hours

00 to 23

this register holds the current hours coded in BCD

format for 24 hour mode

Similar Part No. - PCA2125

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PCA2125 Datasheet(PDF) 10 Page - NXP Semiconductors

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