PCF85263ATSLASHA datasheet(7/92 Pages) NXP

7 / 92 page

NXP Semiconductors

PCF85263A

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

Time registers

Alarm registers

Offset register

RAM byte

Watchdog

Stop and reset

Timestamp registers

Function setting

00h

07h

08h

10h

11h

23h

25h

2Bh

24h

2Ch

2Dh

2Eh

2Fh

aaa-009114

Figure 8. Register map

The 100th seconds, seconds, minutes, hours, days, months, and years as well as the

corresponding alarm registers are all coded in Binary Coded Decimal (BCD) format.

When one of the RTC registers is read, the contents of all time counters are frozen.

Therefore, faulty reading of the clock and calendar during a carry condition is prevented.

7.1 Registers organization overview

7.1.1 Time mode registers

The PCF85263A has two time mode register sets, one for the real-time clock mode and

one for the stopwatch clock mode. The access to these registers can be switched by the

RTCM bit in the Function control register (28h), see Table 6 and Table 53.

RTCM

real-time clock mode

stopwatch mode

aaa-009600

Figure 9. Time mode register set selection

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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PCF85263AT/A Datasheet(PDF) 7 Page - NXP Semiconductors

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