PCF2127ATSLASH1 datasheet(28/80 Pages) NXP

28 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

28 of 80

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

8.9 Time and date function

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

8.9.1 Register Seconds

[1]

Start-up value.

8.9.2 Register Minutes

Table 19.

Seconds - seconds and clock integrity register (address 03h) bit description

Bit

Symbol

Value

Place value Description

OSF

clock integrity is guaranteed

1[1]

clock integrity is not guaranteed:

oscillator has stopped and chip reset

has occurred since flag was last cleared

6 to 4 SECONDS

0 to 5

ten’s place

actual seconds coded in BCD format

3to0

0to9

unit place

Table 20.

Seconds coded in BCD format

Seconds value in

decimal

Upper-digit (ten’s place)

Digit (unit place)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

000

0000

000

0001

000

0010

:::

::::

000

1001

001

0000

:::

::::

101

1000

101

1001

Table 21.

Minutes - minutes register (address 04h) bit description

Bit

Symbol

Value

Place value Description

unused

6 to 4 MINUTES

0 to 5

ten’s place

actual minutes coded in BCD format

3to0

0to9

unit place

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