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PCF2127T/2Y Datasheet(PDF) 44 Page - NXP Semiconductors

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
Logo PHILIPS - NXP Semiconductors

PCF2127T/2Y Datasheet(HTML) 44 Page - NXP Semiconductors

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PCF2127
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 8 — 19 December 2014
44 of 100
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.11.4 Countdown timer function
The countdown timer function is controlled by the WD_CD[1:0] bits in register
Watchdg_tim_ctl (see Table 55).
The timer counts down from the software programmed 8-bit binary value n in register
Watchdg_tim_val. When the counter reaches 1
• the countdown timer flag CDTF is set
• the counter automatically reloads
• and the next time period starts
Loading the counter with 0 effectively stops the timer.
Reading the timer returns the actual value of the countdown counter.
Counter reached 1, WDTF is set logic 1, reset pulse on the RST pin is generated for a time equal
to tw(rst).
Fig 24. WD_CD[1:0] = 11: watchdog activates a reset pulse when timed out
Table 59.
Specification of tw(rst)
WD_CD[1:0]
TF[1:0]
tw(rst)
11
00
244
s
01
15.625 ms
10
15.625 ms
11
15.625 ms



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