PCF85063ATLSLASH1 datasheet(7/55 Pages) NXP

7 / 55 page

NXP Semiconductors

PCF85063A

Tiny Real-Time Clock/calendar with alarm function and I2C-bus

6. Read time registers to see the first change.

7. Apply 64 clock pulses to pin CLKOUT.

8. Read time registers to see the second change.

Repeat 7 and 8 for additional increments.

7.2.1.2 STOP: STOP bit function

The function of the STOP bit (see Figure 6) is to allow for accurate starting of the time circuits. The STOP

bit function causes the upper part of the prescaler (F2 to F14) to be held in reset and thus no 1 Hz ticks are

generated. It also stops the output of clock frequencies below 8 kHz on pin CLKOUT.

aaa-004415

OSCILLATOR

OSCILLATOR STOP

DETECTOR

setting the OS flag

32768 Hz

16384 Hz

8192 Hz

4096 Hz

2 Hz

STOP

1 Hz tick

RESET

F13

RESET

F14

RESET

Figure 6. STOP bit functional diagram

The time circuits can then be set and do not increment until the STOP bit is released (see Figure 7 and Table 6).

Bit

Prescaler bits

Time

STOP

F0F1-F2 to F14

[1]

1 Hz tick

hh:mm:ss

Comment

Clock is running normally

01-0 0001 1101

0100

12:45:12

prescaler counting normally

STOP bit is activated by user. F0F1 are not reset and values cannot be predicted externally

XX-0 0000 0000

0000

12:45:12

prescaler is reset; time circuits are frozen

New time is set by user

XX-0 0000 0000

0000

08:00:00

prescaler is reset; time circuits are frozen

STOP bit is released by user

Table 6. First increment of time circuits after STOP bit release

PCF85063A

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

Product data sheet

Rev. 7.1 — 8 November 2023

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