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PCF2127AT/1 bảng dữ liệu(PDF) 47 Page - NXP Semiconductors

tên linh kiện PCF2127AT/1
Giải thích chi tiết về linh kiện  Integrated RTC, TCXO and quartz crystal
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nhà sản xuất  NXP [NXP Semiconductors]
Trang chủ  http://www.nxp.com
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PCF2127AT/1 bảng dữ liệu(HTML) 47 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
47 of 80
NXP Semiconductors
PCF2127A
Integrated RTC, TCXO and quartz crystal
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 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.
In this example, bit TI_TP is logic 1 and the MSF flag is not cleared after an interrupt.
Fig 26. INT example for SI and MI when TI_TP is logic 1
In this example, bit TI_TP is logic 0 and the MSF flag is cleared after an interrupt.
Fig 27. INT example for SI and MI when TI_TP is logic 0
001aaf905
58
59
59
00
11
seconds counter
minutes counter
INT when SI enabled
MSF when SI enabled
INT when only MI enabled
MSF when only MI enabled
12
00
01
001aag072
58
seconds counter
minutes counter
INT when SI enable
MSF when SI enable
INT when only MI enabled
MSF when only MI enabled
59
59
11
00
00
01
12



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