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PCF2129AT データシート(PDF) 37 Page - NXP Semiconductors

部品番号 PCF2129AT
部品情報  Integrated RTC, TCXO and quartz crystal
PDF  68 Pages
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2129AT データシート(HTML) 37 Page - NXP Semiconductors

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PCF2129A_1
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 13 January 2010
37 of 68
NXP Semiconductors
PCF2129A
Integrated RTC, TCXO and quartz crystal
8.12 Interrupt output, INT
PCF2129A has an interrupt output pin INT which is open-drain, active LOW. Interrupts
may be sourced from different places:
• second or minute timer
• watchdog timer
• alarm
• timestamp
• battery switch-over
• battery low detection
When SI, MI, WD_CD, AIE, TSIE, BIE, BLIE are all disabled, INT will remain high-impedance.
Fig 19. Interrupt block diagram
BLF: BATTERY
LOW FLAG
SET
set battery
low flag, BLF
to interface:
read BLF
BLIE
001aaj399
from battery
low detection
circuit: clear BF
CLEAR
BF: BATTERY
FLAG
SET
set battery
flag, BF
to interface:
read BF
BIE
from interface:
clear BF
CLEAR
TSFx: TIMESTAMP
FLAG
SET
set timestamp
flag, TSFx
to interface:
read TSFx
TSIE
from interface:
clear TSF
CLEAR
AF: ALARM
FLAG
SET
set alarm
flag, AF
to interface:
read AF
AIE
from interface:
clear AF
CLEAR
WDTF:
WATCHDOG
TIMER FLAG
SET
WATCHDOG
COUNTER
to interface:
read WD_CD
WD_CD = 0
WD_CD = 1
MCU loading
watchdog counter
CLEAR
INT pin
MSF:
MINUTE
SECOND FLAG
SET
MINUTES COUNTER
SECONDS COUNTER
to interface:
read MSF
SI/MI
TI_TP
0
1
from interface:
clear MSF
CLEAR
SI
MI
PULSE
GENERATOR 1
TRIGGER
CLEAR



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