PCF2123 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2123' PDF : 63 Pages View PDF
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
Table 17. Month assignments in BCD format
Month
Upper-digit Digit (unit place)
(ten’s place)
Bit 4
Bit 3
Bit 2
January
0
0
0
February
0
0
0
March
0
0
0
April
0
0
1
May
0
0
1
June
0
0
1
July
0
0
1
August
0
1
0
September 0
1
0
October
1
0
0
November
1
0
0
December
1
0
0
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
8.4.7 Register Years
Table 18. Years - years register (08h) bit description
Bit
Symbol
Value
Place value Description
7 to 4 YEARS
0 to 9
ten’s place actual year coded in BCD format
3 to 0
0 to 9
unit place
8.4.8 Setting and reading the time
Figure 10 shows the data flow and data dependencies starting from the 1 Hz clock tick.
1 Hz tick
SECONDS
MINUTES
12_24 hour mode
LEAP YEAR
CALCULATION
HOURS
DAYS
MONTHS
WEEKDAY
YEARS
Fig 10. Data flow of the time function
001aaf901
PCF2123
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 15 July 2013
© NXP B.V. 2013. All rights reserved.
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