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PCF85263ATL/A Datasheet(PDF) 24 Page - NXP Semiconductors

Part # PCF85263ATL/A
Description  Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus
PDF  102 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF85263ATL/A Datasheet(HTML) 24 Page - NXP Semiconductors

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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
Tens of hour alarm1 enable
0 [1]
Disabled
2
HR_XX_XX_00_A1E
1
Enabled
Minute alarm1 enable
0 [1]
Disabled
1
MIN_A1E
1
Enabled
Second alarm1 enable
0 [1]
Disabled
0
SEC_A1E
1
Enabled
Table 15. Alarm_enables- alarm enable control register (address 10h) bit description...continued
[1]
Default value.
7.4.2.3 Alarm1 and alarm2 function in stop-watch mode
The registers at addresses 08h through 0Ch contain alarm1 information. When one or more of these
registers is loaded with second, minute, and hours, and its corresponding alarm enable bit (SEC_A1E to
HR_00_XX_XX_A1E) is set logic 1, then that information is compared with the current second, minute, and
hours.
The registers at addresses 0Dh through 0Fh contain alarm2 information. When one or more of these registers
is loaded with minutes and hours, and its corresponding alarm enable bit (MIN_A2E to HR_00_XX_A2E) is set
logic 1, then that information is compared with the current minute and hours.
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. For details, see
Section 7.4.3.
PCF85263A
All information provided in this document is subject to legal disclaimers.
© 2025 NXP B.V. All rights reserved.
Product data sheet
Rev. 5.4 — 12 December 2025
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