PCF2123TS datasheet(14/54 Pages) NXP

14 / 54 page

PCF2123_1

Product data sheet

Rev. 01 — 19 November 2008

14 of 54

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

9.6 Time and date function

The majority of the registers are coded in the Binary Coded Decimal (BCD) format. BCD

is used to simplify application use. An example is shown for the Minutes register in

Table 8.

[1]

Values shown in decimal.

[1]

Values shown in decimal.

Table 8.

BCD example

Minutes value

(decimal)

Upper-digit

Digit

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00000000

00000001

00000010

::::::::

00001001

00010000

::::::::

01011000

01011001

Table 9.

Bit

Symbol

Value

Description

clock integrity is guaranteed

clock integrity is not guaranteed; oscillator has stopped

or been interrupted

6 to 0

SECONDS

00 to 59[1]

this register holds the current seconds coded in BCD

format

Table 10.

Bit

Symbol

Value

Description

unused

6 to 0

MINUTES

00 to 59[1]

this register holds the current minutes coded in BCD

format

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