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PCF2127AT/1 Datasheet(PDF) 37 Page - NXP Semiconductors

Part # PCF2127AT/1
Description  Integrated RTC, TCXO and quartz crystal
PDF  80 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2127AT/1 Datasheet(HTML) 37 Page - NXP Semiconductors

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PCF2127A_2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
37 of 80
NXP Semiconductors
PCF2127A
Integrated RTC, TCXO and quartz crystal
Remark: WDTF is read only and cannot be cleared with the interface. 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 set logic 1, and an interrupt is generated.
Fig 21. WD_CD[1:0] = 10: watchdog activates an interrupt when timed out
Counter reached 1, WDTF is set logic 1, reset pulse on the RST pin is generated for a time equal
to tw(rst).
Fig 22. WD_CD[1:0] = 11: watchdog activates a reset pulse when timed out
001aag062
watchdog
timer value
WDTF
n = 1
n
MCU
INT
001aag063
watchdog
timer value
WDTF
tw(rst)
n = 1
n
MCU
RST



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