PCF85263ATLSLASHA datasheet(21/102 Pages) NXP

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NXP Semiconductors

PCF85263A

Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus

Bit

Symbol

Value

Description

0 [1]

Disabled

Enabled

Table 13. Alarm_enables- alarm enable control register (address 10h) bit description...continued

[1]

Default value.

7.4.1.3 Alarm1 and alarm2 function in RTC mode

The registers at addresses 08h through 0Ch contain alarm1 information. When one or more of these registers

is loaded with second, minute, hour, day, or month, and its corresponding alarm enable bit (SEC_A1E to

MON_A1E) is set logic 1, then that information is compared with the current second, minute, hour, day, and

month.

The registers at addresses 0Dh through 0Fh contain alarm2 information. When one or more of these registers

is loaded with minute, hour or weekday, and its corresponding alarm enable bit (MIN_A2E to WDAY_A2E) is set

logic 1, then that information is compared with the current minute, hour, and weekday.

Alarm registers having their alarm enable bit at logic 0 are ignored.

When the time increments to match the enabled alarms, the alarm flag in the Flags register (Section 7.14) is

set. A1F for alarm1 and A2F for alarm2. The alarm flag is cleared by command.

When the time increments to match the enabled alarms, an interrupt can be generated. See Section 7.4.3.

PCF85263A

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

Product data sheet

Rev. 5.4 — 12 December 2025

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PCF85263ATL/A Datasheet(PDF) 21 Page - NXP Semiconductors