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PCA2125TS Datasheet(PDF) 13 Page - NXP Semiconductors

Part # PCA2125TS
Description  SPI Real time clock / calendar
PDF  40 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA2125TS Datasheet(HTML) 13 Page - NXP Semiconductors

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PCA2125_00
© NXP B.V. 2007. All rights reserved.
Preliminary data sheet
Rev. 00.11 — 30 January 2007
13 of 40
NXP Semiconductors
PCA2125
SPI Real time clock / calendar
5 to 0
hour
alarm
00 to 23
this register holds the hour alarm information coded in BCD format
when in 24 hour mode.
12 hour mode
5am/pm
alarm
0 to 1
this register holds the hour alarm information coded in BCD format
when in 12 hour mode
4 to 0
hour
alarm
00 to 11
Table 21.
Day alarm (address 0BHEX) bits description
Bit
Symbol
Value
Description
7
AEn
0
day alarm is enabled
1
day alarm is disabled
5to 0
day
alarm
01 to 31
this register holds the day alarm information coded in BCD format
Table 22.
Weekday alarm (address 0CHEX) bits description
Bit
Symbol
Value
Description
7
AEn
0
weekday alarm is enabled
1
weekday alarm is disabled
2 to 0
weekday
alarm
0 to 6
this register holds the weekday alarm information
Fig 8.
Alarm function block diagram
Table 20.
Hour alarm (address 0AHEX) bits description
Bit
Symbol
Value
Description
001aaf902
WEEKDAY ALARM
WEEKDAY AEN
WEEKDAY TIME
=
DAY ALARM
DAY AEN
DAY TIME
=
HOUR ALARM
HOUR AEN
HOUR TIME
=
MINUTE ALARM
MINUTE AEN
MINUTE TIME
=
check now signal
set alarm flag, AF
E.G. MINUTE AEN1
1
0



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