PCF85363ATLSLASHAX datasheet(6/86 Pages) NXP

6 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

aaa-011067

Time and configuration

registers

RAM registers

Time registers

Alarm registers

Offset register

Single RAM byte

Watchdog

Stop and reset

Timestamp registers

Control registers

00h

07h

08h

10h

11h

23h

25h

2Bh

24h

2Ch

2Dh

2Eh

2Fh

40h

42h

7Dh

7Fh

1st RAM byte

2nd RAM byte

3rd RAM byte

62nd RAM byte

63rd RAM byte

64th RAM byte

Figure 6. Register map

All registers (see Table 4, Table 5, and Table 6) are designed as addressable 8-bit

parallel registers although not all bits are implemented. Figure 6 gives an overview of the

address 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 PCF85363A 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.

PCF85363A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 18 June 2021

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