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PCA2125 Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCA2125
Description  SPI Real-time clock/calendar
PDF  36 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA2125 Datasheet(HTML) 8 Page - NXP Semiconductors

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PCA2125_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 28 July 2008
8 of 36
NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
8.4 Time and date function
The majority of the registers are coded in the Binary Coded Decimal (BCD) format. BCD
is used to simplify application use.
An example is shown for register Minutes in Table 8.
[1]
Hour mode is set by bit 12_24 in register Control_1.
Table 8.
BCD example
Minutes value
(decimal)
Double-digit
Digit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
23
22
21
20
23
22
21
20
00
00000000
01
00000001
02
00000010
:
::::::::
09
00001001
10
00010000
:
::::::::
58
01011000
59
01011001
Table 9.
Register Seconds (address 02h) bit description
Bit
Symbol
Value
Description
7
RF
0
clock integrity is guaranteed
1
clock integrity is not guaranteed; chip reset has
occurred since flag was last cleared
6 to 0
SECONDS[6:0]
00 to 59
this register holds the current seconds value coded in
BCD format
Table 10.
Register Minutes (address 03h) bit description
Bit
Symbol
Value
Description
7
-
0
unused
6 to 0
MINUTES[6:0]
00 to 59
this register holds the current minutes value coded in
BCD format
Table 11.
Register Hours (address 04h) bit description
Bit
Symbol
Value
Description
6 and 7
-
0
unused
12 hour mode[1]
5
AMPM
0
indicates AM
1
indicates PM
4 to 0
HOURS[4:0]
01 to 12
this register holds the current hours value coded in
BCD format for 12 hour mode
24 hour mode[1]
5 to 0
HOURS[5:0]
00 to 23
this register holds the current hours value coded in
BCD format for 24 hour mode



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