PCF8564A datasheet(7/59 Pages) NXP

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PCA85063A

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Product data sheet

Rev. 4 — 30 March 2018

7 of 59

NXP Semiconductors

PCA85063A

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

8.2.1.1

EXT_TEST: external clock test mode

A test mode is available which allows for on-board testing. In this mode, it is possible to

set up test conditions and control the operation of the RTC.

The test mode is entered by setting bit EXT_TEST in register Control_1. Then

pin CLKOUT becomes an input. The test mode replaces the internal clock signal with the

signal applied to pin CLKOUT.

The signal applied to pin CLKOUT should have a minimum pulse width of 300 ns and a

maximum period of 1000 ns. The internal clock, now sourced from CLKOUT, is divided

down to 1 Hz by a 26 divide chain called a prescaler. The prescaler can be set into a

known state by using bit STOP. When bit STOP is set, the prescaler is reset to 0. (STOP

must be cleared before the prescaler can operate again.)

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.

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