PCF85263ATLSLASHA datasheet(56/102 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 Flag name

Value

Description

Read: timestamp register 1 flag inactive

0 [1]

Write: timestamp register 1 flag is cleared

Read: timestamp register 1 flag active

TSR1F

Timestamp Register 1

event Flag

Section 7.7

Write: timestamp register 1 flag remains unchanged

Table 59. Flags - Flag status register (address 2Bh) bit description...continued

[1]

Default value.

The flags are set by their respective function. A full description can be found there. All flags behave the same

way. They are set by some function of the IC and remain set until overwritten by a command. It is possible to

clear flags individually. To prevent one flag being overwritten while clearing another, a logic AND is performed

during a write access. All flags are combined to generate an event monitoring signal called EMON. EMON is

described in Section 7.2.3 and can be read as the MSB of minutes register.

7.15 Reset register

Bit

Symbol

CPR

CTS

Section

Section 7.15.2

Section 7.15.1

Section 7.15.3

Table 60. Reset - software reset control (address 2Fh) bit description

For a:

• Software reset (SR), 0010 1100 (2Ch) must be sent to register Reset (address 2Fh). A software reset also

triggers CPR and CTS.

• Clear prescaler (CPR), 1010 0100 (A4h) must be sent to register Reset (address 2Fh).

• Clear timestamp (CTS),0010 0101 (25h) must be sent to register Reset (address 2Fh).

It is possible to combine CPR and CTS by sending 1010 0101 (A5h).

Remark: Any other value sent to this register is ignored.

7.15.1 SR: Software reset

A reset is automatically generated at power on. A reset can also be initiated with the software reset command.

0 1

A 0

A 0 0

A P/S

SDA

SCL

target address

address 2Fh

software reset 2Ch

R/W

aaa-010473

internal

reset signal

Figure 31. Software reset command

The PCF85263A resets to the following conditions:

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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