PCF8564AU datasheet(7/48 Pages) NXP

7 / 48 page

PCF8564A

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Product data sheet

Rev. 3 — 26 August 2013

7 of 48

NXP Semiconductors

PCF8564A

Real time clock and calendar

8.3 Control registers

8.3.1 Register Control_1

[1]

Default value.

[2]

Bits labeled as N should always be written with logic 0.

8.3.2 Register Control_2

[1]

Bits labeled as N should always be written with logic 0.

[2]

Default value.

Table 6.

Control_1 - control and status register 1 (address 00h) bit description

Bit

Symbol

Value

Description

Reference

TEST1

0[1]

normal mode;

• must be set to logic 0 during normal operations

Section 8.9

EXT_CLK test mode (see Section 8.9)

0[2]

default value

5STOP

0[1]

RTC source clock runs

Section 8.10

• RTC divider chain flip-flops are asynchronously set to logic 0

• the RTC clock is stopped (CLKOUT at 32.768 kHz is still available)

0[2]

default value

TESTC

Power-On Reset (POR) override facility is disabled;

• set to logic 0 for normal operation (see Section 8.11.1)

Section 8.11.1

1[1]

Power-On Reset (POR) override is enabled

2 to 0

000[2]

default value

Table 7.

Control_2 - control and status register 2 (address 01h) bit description

Bit

Symbol

Value

Description

Reference

7to5

000[1]

default value

4TI_TP

0[2]

INT is active when TF is active (subject to the status of TIE)

1INT pulses active according to Table 8 (subject to the status of TIE);

• Remark: note that if AF and AIE are active then INT will be

permanently active

Section 8.3.2.1

and

Section 8.8

3AF

0[2]

alarm flag inactive

Section 8.3.2.1

alarm flag active

2TF

0[2]

timer flag inactive

Section 8.3.2.1

timer flag active

1AIE

0[2]

alarm interrupt disabled

Section 8.3.2.1

alarm interrupt enabled

0TIE

0[2]

timer interrupt disabled

Section 8.3.2.1

timer interrupt enabled

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