PCA8565 datasheet(12/39 Pages) NXP

12 / 39 page

PCA8565_2

Product data sheet

Rev. 02 — 16 June 2009

12 of 39

NXP Semiconductors

PCA8565

Real time clock/calendar

3. Send a RESTART condition or STOP followed by START.

4. Send the slave address for read (A3h).

5. Read the register Seconds.

6. Read the register Minutes.

7. Read the register Hours.

8. Read the register Days.

9. Read the register Weekdays.

10. Read the register Months_century.

11. Read the register Years.

12. Send a STOP condition.

9.6 Alarm function

When one or more of the alarm registers are loaded with a valid minute, hour, day or

weekday and its corresponding bit alarm enable (AE_x) is logic 0, then that information is

compared with the actual minute, hour, day and weekday.

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

It’s only on increment to a matched case that the alarm is set, see Section 9.6.2.

Fig 6.

Alarm function block diagram

013aaa088

WEEKDAY ALARM

AE_W

WEEKDAY TIME

DAY ALARM

AE_D

DAY TIME

HOUR ALARM

AE_H

HOUR TIME

MINUTE ALARM

AE_M

MINUTE TIME

check now signal

set alarm flag, AF(1)

AE_M= 1

example

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