PCF2127 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2127' PDF : 101 Pages View PDF
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
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In this example, bit TI_TP is logic 1 and the MSF flag is not cleared after an interrupt.
Fig 28. INT example for SI and MI when TI_TP is logic 1
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In this example, bit TI_TP is logic 0 and the MSF flag is cleared after an interrupt.
Fig 29. INT example for SI and MI when TI_TP is logic 0
The pulse generator for the minute/second interrupt operates from an internal 64 Hz clock
and generates a pulse of 1⁄64 seconds in duration.
8.13.2 Countdown timer interrupts
The generation of interrupts from the countdown timer is controlled by the CDTIE bit
(register Control_2).
The interrupt may be generated as a pulsed signal at every countdown period or as a
permanently active signal which follows the status of the countdown timer flag CDTF. Bit
TI_TP is used to control this bit.
8.13.3 INT pulse shortening
The pulse generator for the countdown timer interrupt also uses an internal clock, but this
time it is dependent on the selected source clock for the countdown timer and on the
countdown value n. As a consequence, the width of the interrupt pulse varies (see
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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