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PCF2123 Datasheet(PDF) 36 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) 36 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
36 of 63
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
In Figure 24, the register Seconds is set to 45 seconds and the register Minutes is set to
10 minutes.
Table 42.
Command byte definition
Bit
Symbol
Value
Description
7R/W
data read or data write selection
0
write data
1
read data
6 to 4
SA
001
subaddress; other codes will cause the device
to ignore data transfer
3 to 0
RA
0h to Fh
register address range
Fig 24. Serial bus write example
001aaf915
xx
address
counter
CE
SDI
SCL
02
03
04
seconds data 45BCD
minutes data 10BCD
R/W
addr 02HEX
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
1
b0
0
b7
0
b6
1
b5
0
b4
0
b3
0
b2
1
b1
0
b0
1
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
0
b0
0
Fig 25. Serial bus read example
001aaf916
xx
address
counter
CE
SDO
SDI
SCL
07
08
09
months data 11BCD
years data 06BCD
R/W
addr 07HEX
b7
1
b6
0
b5
0
b4
1
b3
0
b2
1
b1
1
b0
1
b7
0
b6
0
b5
0
b4
1
b3
0
b2
0
b1
0
b0
1
b7
0
b6
0
b5
0
b4
0
b3
0
b2
1
b1
1
b0
0



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