PCF2123BS/1 NXP Semiconductors, PCF2123BS/1 Datasheet - Page 36

• Manufacturer Part Number: PCF2123BS/1
• Manufacturer: NXP Semiconductors

Specifications of PCF2123BS/1

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
Fig 24. Serial bus write example
Fig 25. Serial bus read example
address
address
counter
counter
SDO
SCL
SCL
SDI
SDI
CE
CE
R/W
R/W
b7
b7
xx
xx
0
1
b6
b6
0
0
b5
b5
Table 42.
In
10 minutes.
0
0
Bit
7
6 to 4
3 to 0
Figure
b4
b4
1
1
b3
b3
0
0
Symbol
R/W
SA
RA
addr 02
addr 07
24, the register Seconds is set to 45 seconds and the register Minutes is set to
b2
b2
Command byte definition
0
1
b1
b1
HEX
1
HEX
1
All information provided in this document is subject to legal disclaimers.
b0
b0
0
1
b7
b7
0
0
02
07
Rev. 5 — 27 April 2011
b6
b6
1
0
seconds data 45
months data 11
b5
b5
0
0
Value
0
1
001
0h to Fh
b4
b4
0
1
b3
b3
0
0
BCD
BCD
b2
b2
1
0
b1
b1
0
0
Description
data read or data write selection
write data
read data
subaddress; other codes will cause the device
to ignore data transfer
register address range
b0
b0
1
1
b7
b7
0
0
03
08
b6
b6
0
0
minutes data 10
b5
b5
years data 06
0
0
SPI Real time clock/calendar
b4
b4
1
0
b3
b3
0
0
BCD
BCD
b2
b2
0
1
PCF2123
© NXP B.V. 2011. All rights reserved.
b1
b1
0
1
001aaf915
001aaf916
b0
b0
0
0
04
09
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