PCF2129T 데이터 시트보기 (PDF) - NXP Semiconductors.

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PCF2129T

Accurate RTC with integrated quartz crystal for industrial

NXP Semiconductors. 

NXP Semiconductors

PCF2129T

Accurate RTC with integrated quartz crystal for industrial

8.2 Control registers

The first 3 registers of the PCF2129T, with the addresses 00h, 01h, and 02h, are used as

control registers.

8.2.1 Register Control_1

Table 6. Control_1 - control and status register 1 (address 00h) bit description

Bit Symbol

Value Description

Reference

7

EXT_TEST 0

[1] normal mode

Section 8.13

1

external clock test mode

6

T

0

[2] unused

-

5

STOP

0

[1] RTC source clock runs

Section 8.14

1

RTC clock is stopped;

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

TSF1

0

[1] no timestamp interrupt generated

Section 8.11.1

1

flag set when TS input is driven to an

intermediate level between power supply and

ground;

flag must be cleared to clear interrupt

3

POR_OVRD 0

[1] Power-On Reset Override (PORO) facility

Section 8.7.2

disabled;

set logic 0 for normal operation

1

PORO enabled

2

12_24

0

[1] 24 hour mode selected

Table 19

1

12 hour mode selected

1

MI

0

[1] minute interrupt disabled

Section 8.12.1

1

minute interrupt enabled

0

SI

0

[1] second interrupt disabled

1

second interrupt enabled

[1] Default value.

[2] When writing to the register this bit always has to be set logic 0.

PCF2129T

Product data sheet

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

Rev. 3 — 12 February 2013

© NXP B.V. 2013. All rights reserved.

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