PCF85063TP datasheet(7/46 Pages) NXP

7 / 46 page

PCF85063TP

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Product data sheet

Rev. 2 — 15 April 2013

7 of 46

NXP Semiconductors

PCF85063TP

Tiny Real-Time Clock/calendar

From a stop condition, the first 1 second increment will take place after 32 positive edges

on pin CLKOUT. Thereafter, every 64 positive edges cause a 1 second increment.

Remark: Entry into test mode is not synchronized to the internal 64 Hz clock. When

entering the test mode, no assumption as to the state of the prescaler can be made.

Operation example:

1. Set EXT_TEST test mode (register Control_1, bit EXT_TEST = 1)

2. Set STOP (register Control_1, bit STOP = 1)

3. Clear STOP (register Control_1, bit STOP = 0)

4. Set time registers to desired value

5. Apply 32 clock pulses to pin CLKOUT

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.

8.2.1.2

STOP: STOP bit function

The function of the STOP bit (see Figure 4) 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 lower than 8 kHz on pin CLKOUT.

The time circuits can then be set and do not increment until the STOP bit is released (see

Figure 5 and Table 7).

Fig 4.

STOP bit functional diagram

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