PCF85363ATLSLASHAX datasheet(21/86 Pages) NXP

21 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

aaa-009583

SECOND ALARM1

SECOND TIME

SEC_A1E

SEC_A1E = 0

example

MINUTE ALARM1

MINUTE TIME

MIN_A1E

HR_xx_xx_00 ALARM1

xx_xx_00 HOUR TIME

HR_xx_xx_00_A1E

set alarm flag A1F (1)

HR_xx_00_xx ALARM1

xx_00_xx HOUR TIME

HR_xx_00_xx_A1E

HR_00_xx_xx ALARM1

00_xx_xx HOUR TIME

HR_00_xx_xx_A1E

check now signal

MIN_A2E = 0

example

MINUTE ALARM2

MINUTE TIME

MIN_A2E

HR_xx_00 ALARM2

xx_xx_00 HOUR TIME

HR_xx_00_A2E

set alarm flag A2F (1)

HR_00_xx ALARM2

xx_00_xx HOUR TIME

HR_00_xx_A2E

check now signal

1. Only when all enabled alarm settings are matching.

The flag is set

only on increment to a matched case (and not all the time it is equal).

Figure 12. Alarm1 and alarm2 function block diagram (stop-watch mode)

7.4.3 Alarm interrupts

The generation of interrupts from the alarm functions is controlled via the alarm interrupt

enable bits; A1IEA, A1IEB, A2IEA, A2IEB. These bits are in registers INTA_enable

(address 29h) and INTB_enable (address 2Ah).

The assertion of flags A1F or A2F can be used to generate an interrupt at the pins

INTA and INTB. The interrupt may be generated as a pulse signal every time the time

PCF85363A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 18 June 2021

21 / 86

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