PCF2123TS datasheet(10/54 Pages) NXP

tên linh kiện	PCF2123TS

Giải thích chi tiết về linh kiện	SPI Real time clock/calendar

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10 / 54 page

PCF2123_1

Product data sheet

Rev. 01 — 19 November 2008

10 of 54

NXP Semiconductors

PCF2123

SPI Real time clock/calendar

9.3 Control registers

9.3.1 Register Control_1

[1]

To prevent an accidental software reset, 01011000 (58h) must be sent to register Control_1 (see

Section 9.5).

Table 5.

Bit

Symbol

Value

Description

Reference

EXT_TEST

normal mode

Section 9.12

external clock test mode

unused

STOP

the RTC source clock runs

Section 9.13

the RTC clock is stopped;

RTC divider chain ﬂip-ﬂops are

asynchronously set to logic 0;

CLKOUT at 32.768 kHz, 16.384 kHz or

8.192 kHz is still available

no software reset

Section 9.5

initiate software reset[1];

this register will always return a 0 when

read

unused

12_24

24 hour mode is selected

12 hour mode is selected

CIE

no correction interrupt generated

Section 9.11

interrupt pulses will be generated at every

correction cycle

unused

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