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PCF2123 Datasheet(PDF) 24 Page - NXP Semiconductors

Part # PCF2123
Description  SPI Real time clock/calendar Time keeping application
PDF  63 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2123 Datasheet(HTML) 24 Page - NXP Semiconductors

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PCF2123
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 27 April 2011
24 of 63
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
Three examples are given for clearing the flags. Clearing the flags is made by a write
command, therefore bits 7, 6, 4, 1 and 0 must be written with their previous values.
Repeatedly re-writing these bits has no influence on the functional behavior.
Table 31, Table 32, and Table 33 show what instruction must be sent to clear the
appropriate flag.
Clearing the alarm flag (bit AF) operates in exactly the same way, see Section 8.5.5.
Table 30.
Flag location in register Control_2
Register
Bit
7
6
5
4
3
2
1
0
Control_2
-
-
MSF
-
AF
TF
-
-
Table 31.
Example to clear only TF (bit 2) in register Control_2
Register
Bit
7
6
5
4
3
2
1
0
Control_2
-
-
1
-
1
0
-
-
Table 32.
Example to clear only MSF (bit 5) in register Control_2
Register
Bit
7
6
5
4
3
2
1
0
Control_2
-
-
0
-
1
1
-
-
Table 33.
Example to clear both TF and MSF (bit 2 and bit 5) in register Control_2
Register
Bit
7
6
5
4
3
2
1
0
Control_2
-
-
0
-
1
0
-
-



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