PCF2131 datasheet(10/86 Pages) NXP

10 / 86 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

7.2 Control registers

The first five registers of the PCF2131, with the addresses 00h, 01h, 02h, 03h and 04h,

are used as control registers.

7.2.1 Register Control_1

Bits labeled as T are unused and return 0 when read.

Bit

Symbol

EXT_

TEST

TC_DIS

STOP

100TH_

S_DIS

POR_

OVRD

12_24

Reset

value

Table 5. Control_1 - control and status register 1 (address 00h) bit allocation

Bits labeled as T are unused and return 0 when read.

Bit

Symbol

Value

Description

Reference

normal mode

EXT_TEST

external clock test mode

Section 7.14

Temperature compensation enabled

TC_DIS

Temperature compensation disabled

Section 7.3.1

RTC source clock runs

STOP

RTC clock is stopped;

RTC divider chain flip-flops are asynchronously

set logic 0;

CLKOUT output frequencies are still available

Section 7.15

100th seconds counter enabled

100TH_S_DIS

100th seconds counter Disabled, register 06h reset

to 00h.

Power-On Reset Override (PORO) facility disabled;

set logic 0 for normal operation

POR_OVRD

Power-On Reset Override (PORO) sequence

reception enabled

Section 7.7.2

24-hour mode selected

12_24

12-hour mode selected

Table 34,

Table 50,

Table 71

minute interrupt disabled

minute interrupt enabled

second interrupt disabled

second interrupt enabled

Section 7.13.1

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

PCF2131

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Product data sheet

Rev. 1.0 — 28 May 2021

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