PCF2127AT/1 NXP [NXP Semiconductors], PCF2127AT/1 Datasheet - Page 47

• Manufacturer Part Number: PCF2127AT/1
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF2127A_2
Product data sheet
8.13.2 Countdown timer interrupts
The pulse generator for the minute/second interrupt operates from an internal 64 Hz clock
and generates a pulse of
The generation of interrupts from the countdown timer is controlled via 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.
Fig 26. INT example for SI and MI when TI_TP is logic 1
Fig 27. INT example for SI and MI when TI_TP is logic 0
MSF when only MI enabled
INT when only MI enabled
MSF when SI enabled
MSF when only MI enabled
INT when SI enabled
INT when only MI enabled
In this example, bit TI_TP is logic 1 and the MSF flag is not cleared after an interrupt.
In this example, bit TI_TP is logic 0 and the MSF flag is cleared after an interrupt.
seconds counter
minutes counter
MSF when SI enable
INT when SI enable
All information provided in this document is subject to legal disclaimers.
seconds counter
minutes counter
Rev. 02 — 7 May 2010
1
⁄
64
58
seconds in duration.
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59
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Integrated RTC, TCXO and quartz crystal
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11
59
11
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00
12
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PCF2127A
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01
© NXP B.V. 2010. All rights reserved.
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