PCF2129 datasheet(11/86 Pages) PHILIPS

11 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

11 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.2.2 Register Control_2

Table 8.

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

Bits labeled as T must always be written with logic 0.

Bit

Symbol

MSF

WDTF

TSF2

TSIE

AIE

Reset

value

000

0000

Table 9.

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

Bits labeled as T must always be written with logic 0.

Bit

Symbol

Value

Description

Reference

MSF

no minute or second interrupt generated

Section 8.12

flag set when minute or second interrupt generated;

flag must be cleared to clear interrupt

WDTF

no watchdog timer interrupt or reset generated

Section 8.12.3

flag set when watchdog timer interrupt or reset

generated;

flag cannot be cleared by command (read-only)

TSF2

no timestamp interrupt generated

Section 8.11.1

flag set when TS input is driven to ground;

flag must be cleared to clear interrupt

no alarm interrupt generated

Section 8.9.6

flag set when alarm triggered;

flag must be cleared to clear interrupt

unused

TSIE

no interrupt generated from timestamp flag

Section 8.12.5

interrupt generated when timestamp flag set

AIE

no interrupt generated from the alarm flag

Section 8.12.4

interrupt generated when alarm flag set

unused

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