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PCF2123 Datasheet(PDF) 18 Page - NXP Semiconductors

Part # PCF2123
Description  SPI Real time clock/calendar
PDF  54 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2123 Datasheet(HTML) 18 Page - NXP Semiconductors

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PCF2123_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 19 November 2008
18 of 54
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
[1]
Values shown in decimal.
[1]
Values shown in decimal.
[1]
Values shown in decimal.
Table 19.
Register Hour_alarm (address 0Ah) bits description
Bit
Symbol
Value
Description
7
AEN_H
0
hour alarm is enabled
1
hour alarm is disabled
6
-
-
unused
12 hour mode
5
AMPM
0
indicates AM
1
indicates PM
4 to 0
HOUR_ALARM
01 to 12[1]
this register holds the hour alarm information coded in
BCD format when in 12 hour mode
24 hour mode
5 to 0
HOUR_ALARM
00 to 23[1]
this register holds the hour alarm information coded in
BCD format when in 24 hour mode
Table 20.
Register Day_alarm (address 0Bh) bits description
Bit
Symbol
Value
Description
7
AEN_D
0
day alarm is enabled
1
day alarm is disabled
6
-
-
unused
5 to 0
DAY_ALARM
01 to 31[1]
this register holds the day alarm information coded in
BCD format
Table 21.
Register Weekday_alarm (address 0Ch) bits description
Bit
Symbol
Value
Description
7
AEN_W
0
weekday alarm is enabled
1
weekday alarm is disabled
3 to 6
-
-
unused
2 to 0
WEEKDAY_
ALARM
0to6[1]
this register holds the weekday alarm information



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