PCF85263ATLSLASHA datasheet(53/102 Pages) NXP

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NXP Semiconductors

PCF85263A

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

When disabled, the timers are reset. When enabled, the time to the first pulse is between the chosen period and

the chosen period minus 1 seconds.

The timers are not affected by STOP.

When the periodic interrupt triggers, the PIF (PI flag) in the Flags register (Section 7.14) is set.

The flag does not have to be cleared to allow another INTA or INTB pulse.

The duration of the periodic interrupt is unaffected by offset calibration.

For details, see Section 7.9 for a description of interrupt pulse control and output pins.

7.13.3 RTCM: RTC mode

Bit

Symbol

Value

Description

RTC mode

0 [1]

Real-time clock mode

RTCM

Stop-watch mode

Table 53. RTCM bit - Function control register (address 28h)

[1]

Default value.

The RTC mode is used to control how the time is counted. When configured as a classic RTC, the time is

counted from 100th seconds to years. In stop-watch mode, time is counted from 100th seconds to 999 999

hours.

RTCM

Mode

Time counting

RTC

100th seconds [1], seconds, minutes, hours, days, weekdays, months, years

Stop-watch

100th seconds [1], seconds, minutes, hours (0 hours to 999 999 hours)

Table 54. RTC time counting modes

[1]

Enabled with 100TH bit in the Function register (Section 7.13).

7.13.4 STOPM: STOP mode control

Bit

Symbol

Value

Description

STOP mode

0 [1]

RTC stop is controlled by STOP bit only

STOPM

RTC stop is controlled by STOP bit or TS pin

Table 55. STOPM bit - Function control register (address 28h)

[1]

Default value.

The STOP register bit in the Oscillator register (Section 7.10) is used to stop the counting of time in both RTC

mode and stop-watch mode. Stopping of the oscillator can also be controlled from the TS pin. The TS pin must

first be configured as an input by TSPM[1:0] bits, then selected for active HIGH or active LOW by the TSL bits.

STOP bit [1]

TSL

TS pin [2]

Oscillator state

Description

Running

Stopped

TS pin active HIGH

Table 56. Oscillator stop control when STOPM = 1

PCF85263A

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Product data sheet

Rev. 5.4 — 12 December 2025

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