PCF8563TSSLASH4 datasheet(15/45 Pages) NXP

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PCF8563

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Product data sheet

Rev. 11 — 26 October 2015

15 of 45

NXP Semiconductors

PCF8563

Real-time clock/calendar

The generation of interrupts from the alarm function is controlled via bit AIE. If bit AIE is

enabled, the INT pin follows the condition of bit AF. AF will remain set until cleared by the

interface. Once AF has been cleared, it will only be set again when the time increments to

match the alarm condition once more. Alarm registers which have their AE_x bit at logic 1

are ignored.

8.7 Register CLKOUT_control and clock output

Frequencies of 32.768 kHz (default), 1.024 kHz, 32 Hz, and 1 Hz can be generated for

use as a system clock, microcontroller clock, input to a charge pump, or for calibration of

the oscillator.

[1]

Default value.

(1) Only when all enabled alarm settings are matching.

It’s only on increment to a matched case that the alarm flag is set, see Section 8.6.5.

Fig 9.

Alarm function block diagram

013aaa088

WEEKDAY ALARM

AEN_W

WEEKDAY TIME

DAY ALARM

AEN_D

DAY TIME

HOUR ALARM

AEN_H

HOUR TIME

MINUTE ALARM

AEN_M

MINUTE TIME

check now signal

set alarm flag AF (1)

AEN_M = 1

example

Table 22.

CLKOUT_control - CLKOUT control register (address 0Dh) bit description

Bit

Symbol

Value

Description

the CLKOUT output is inhibited and CLKOUT output is

set high-impedance

1[1]

the CLKOUT output is activated

6 to 2 -

unused

1 to 0 FD[1:0]

frequency output at pin CLKOUT

00[1]

32.768 kHz

1.024 kHz

32 Hz

1 Hz

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