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PCF2123 Datasheet(PDF) 15 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) 15 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
15 of 63
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
8.4.7 Register Years
8.4.8 Setting and reading the time
Figure 10 shows the data flow and data dependencies starting from the 1 Hz clock tick.
Table 16.
Month assignments in BCD format
Month
Upper-digit
(ten’s place)
Digit (unit place)
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
January
0
0
0
0
1
February
0
0
0
1
0
March
0
0
0
1
1
April
0
0
100
May
0
0
101
June
00
110
July
00
111
August
01
000
September
0
1
0
0
1
October
10
000
November
10
001
December
10
010
Table 17.
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
3to0
0to 9
unit place
Fig 10. Data flow of the time function
001aaf901
1 Hz tick
12_24 hour mode
WEEKDAY
SECONDS
MINUTES
HOURS
DAYS
LEAP YEAR
CALCULATION
MONTHS
YEARS



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