PCF8563BSSLASH4 datasheet(9/45 Pages) NXP

9 / 45 page

PCF8563

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Product data sheet

Rev. 11 — 26 October 2015

9 of 45

NXP Semiconductors

PCF8563

Real-time clock/calendar

Countdown timer interrupts: The pulse generator for the countdown timer interrupt uses

an internal clock and is dependent on the selected source clock for the countdown timer

and on the countdown value n. As a consequence, the width of the interrupt pulse varies

(see Table 7).

[1]

TF and INT become active simultaneously.

[2]

n = loaded countdown value. Timer stops when n = 0.

8.4 Time and date registers

The majority of the registers are coded in the BCD format to simplify application use.

8.4.1 Register VL_seconds

[1]

Start-up value.

Table 7.

INT operation (bit TI_TP = 1)[1]

Source clock (Hz)

INT period (s)

n=1[2]

n> 1[2]

4096

1⁄8192

1⁄4096

1⁄128

1⁄64

1⁄60

1⁄64

Table 8.

VL_seconds - seconds and clock integrity status register (address 02h) bit

description

Bit

Symbol

Value

Place value Description

clock integrity is guaranteed

1[1]

integrity of the clock information is not guaranteed

6 to 4 SECONDS 0 to 5

ten’s place

actual seconds coded in BCD format, see Table 9

3 to 0

0 to 9

unit place

Table 9.

Seconds coded in BCD format

Seconds value

(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

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