PC8523-1(2012) 查看數據表（PDF） - NXP Semiconductors.

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PC8523-1
(Rev.:2012)

Real-Time Clock (RTC) and calendar

NXP Semiconductors. 

NXP Semiconductors

PCF8523

Real-Time Clock (RTC) and calendar

8.2 Control and status registers

8.2.1 Register Control_1

Table 7. Control_1 - control and status register 1 (address 00h) bit description

Bit

Symbol

Value

Description

7

CAP_SEL

internal oscillator capacitor selection for quartz

crystals with a corresponding load capacitance

0[1]

7 pF

1

12.5 pF

6

T

0[1][2]

unused

5

STOP

0[1]

RTC time circuits running

1

RTC time circuits frozen;

RTC divider chain flip-flops are

asynchronously set logic 0;

CLKOUT at 32.768 kHz, 16.384 kHz, or

8.192 kHz is still available

4

SR

0[1][3]

no software reset

1

initiate software reset

3

12_24

0[1]

24 hour mode is selected

1

12 hour mode is selected

2

SIE

0[1]

second interrupt disabled

1

second interrupt enabled

1

AIE

0[1]

alarm interrupt disabled

1

alarm interrupt enabled

0

CIE

0[1]

no correction interrupt generated

1

interrupt pulses are generated at every

correction cycle (see Section 8.8)

[1] Default value.

[2] Must always be written with logic 0.

[3] For a software reset, 01011000 (58h) must be sent to register Control_1 (see Section 8.3). Bit SR always

returns 0 when read.

PCF8523

Product data sheet

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

Rev. 4 — 5 July 2012

© NXP B.V. 2012. All rights reserved.

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