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PCA2125TS Datasheet(PDF) 9 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) 9 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
9 of 40
NXP Semiconductors
PCA2125
SPI Real time clock / calendar
6.3 Control registers
6.3.1 Control 1 register
6.3.2 Control 2 register
Table 7.
Control 1 (address 00HEX) bits description
Bit
Symbol
Value
Description
Section
7
ext test
0
normal mode
Section 6.9
1
external clock test mode
6
0
Reserved for future use.
5
stop
0
RTC source clock runs
Section 6.10
1
RTC divider chain flip-flops are asynchronously set
to logic 0; the RTC clock is stopped (CLKOUT at
32.768, 16.384 or 8.192 kHz is still available)
4
0
Reserved for future use.
3POR
ovrd
0
Power-on reset override facility is disabled; set to
logic 0 for normal operation
Section 6.2.1
1
Power-on reset override may be enabled
2
12/24
0
24 hour mode is selected
Table 15
1
12 hour mode is selected
1 to 0
0 0
Reserved for future use.
Table 8.
Control 2 (address 01HEX) bits description
Bit
Symbol
Value
Description
Section
7
MI
0
Minute interrupt is disabled
Section 6.6.1
1
Minute interrupt is enabled
6
SI
0
Second interrupt is disabled
1
Second interrupt is enabled
5
MSF
0
No minute or second interrupt generated
Section 6.6
1
Flag set when minute or second interrupt
generated. Flag must be cleared to clear interrupt.
2
TF
0
No countdown timer interrupt generated
1
Flag set when countdown timer interrupt generated.
Flag must be cleared to clear interrupt.
4
TI/TP
0
Interrupt pin follows timer flags
Section 6.7.2
1
Interrupt pin generates a pulse
3
AF
0
No alarm interrupt generated
Section 6.5.1
1
Flag set when alarm triggered. Flag must be
cleared to clear interrupt.
1
AIE
0
No interrupt generated from the alarm flag
Section 6.7.3
1
Interrupt generated when alarm flag set
0
TIE
0
No interrupt generated from the countdown timer
flag
Section 6.7
1
Interrupt generated when countdown timer flag set



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