PCF2127TSLASH2Y datasheet(43/100 Pages) PHILIPS

Part #	PCF2127T/2Y

Description	Accurate RTC with integrated quartz crystal for industrial applications

PDF	100 Pages

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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43 / 100 page

PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

43 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

• the watchdog timer starts again

Loading the counter with 0 will:

• reset the flag WDTF

• clear INT or RST

• stop the watchdog timer

Remark: WDTF is read only and cannot be cleared by command. WDTF can be cleared

by:

• loading a value in register Watchdg_tim_val

• reading of the register Control_2

Writing a logic 0 or logic 1 to WDTF has no effect.

• When the watchdog timer counter reaches 1, the watchdog timer flag WDTF is set

logic 1

• When a minute or second interrupt occurs, the minute/second flag MSF is set logic 1

(see Section 8.13.1)

Counter reached 1, WDTF is logic 1, and an interrupt is generated.

Fig 23. WD_CD[1:0] = 10: watchdog activates an interrupt when timed out

PCF2127T/2Y Datasheet(PDF) 43 Page - NXP Semiconductors