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PCF8523T/1 数据表(PDF) 14 Page - NXP Semiconductors

部件名 PCF8523T/1
功能描述  Real-Time Clock (RTC) and calendar
PDF  75 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

PCF8523T/1 数据表(HTML) 14 Page - NXP Semiconductors

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PCF8523
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 5 July 2012
14 of 74
NXP Semiconductors
PCF8523
Real-Time Clock (RTC) and calendar
When SIE, CTAIE, WTAIE, CTBIE, AIE, CIE, BSIE, BLIE, and clock-out are disabled, then INT1 remains high-impedance.
When CTBIE is disabled, then INT2 remains high-impedance.
Fig 8.
Interrupt block diagram
BLF: BATTERY
LOW FLAG
SET
set battery
low flag, BLF
to interface:
read BLF
BLIE
013aaa330
from battery
low detection
circuit: clear BLF
CLEAR
BSF: BATTERY
FLAG
SET
set battery
flag, BSF
to interface:
read BSF
BSIE
from interface:
clear BSF
CLEAR
PULSE
GENERATOR 5
SET
offset circuit:
add/subtract pulse
CIE
from interface:
clear CIE
CLEAR
AF: ALARM
FLAG
SET
set alarm
flag, AF
to interface:
read AF
AIE
from interface:
clear AF
CLEAR
WTAF:
WATCH DOG
TIMER FLAG
SET
WATCHDOG
COUNTER A
to interface:
read WTAF
MCU loading
watchdog counter
or reading WTAF
CLEAR
CTAF:
COUNTDOWN
TIMER A FLAG
SET
COUNTDOWN
COUNTER A
to interface:
read CTAF
CTAIE
INT1
0
1
from interface:
clear CTAF
CLEAR
PULSE
GENERATOR 2
TRIGGER CLEAR
SF:
SECOND FLAG
SET
SECONDS COUNTER
to interface:
read SF
SIE
0
1
from interface:
clear SF
CLEAR
SIE
PULSE
GENERATOR 1
TRIGGER CLEAR
TAM
TAM
CLKOUT
INT1/CLKOUT
ENABLE
TAC = 01
ENABLE
TAC = 10
PULSE
GENERATOR 3
TRIGGER CLEAR
WTAIE
0
1
TAM
CTBF:
COUNTDOWN
TIMER B FLAG
SET
COUNTDOWN
COUNTER B
to interface:
read CTBF
CTBIE
0
1
from interface:
clear CTBF
CLEAR
PULSE
GENERATOR 4
TRIGGER CLEAR
TBM
ENABLE
TBC = 1
INT2



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