PCF85263ATSLASHA datasheet(18/92 Pages) NXP

18 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

Bit

Symbol

Value

Description

second alarm1 enable

0 [1]

disabled

SEC_A1E

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 which have their alarm enable bit at logic 0 are ignored.

When the time increments to match the enabled alarms, the alarm flag in the Flags

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 — 1 February 2021

18 / 92

PCF85263AT/A Datenblatt(PDF) 18 Page - NXP Semiconductors