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PCF2123 Datasheet(PDF) 15 Page - NXP Semiconductors

Part # PCF2123
Description  SPI Real time clock/calendar
PDF  55 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_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
15 of 55
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
9.6.7 Register Years
9.6.8 Setting and reading the time
Figure 11 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
1
0
0
May
0
0101
June
00110
July
00111
August
0
1
0
0
0
September
0
1
0
0
1
October
1
0
0
0
0
November
1
0
0
0
1
December
1
0
0
1
0
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
3 to 0
0 to 9
unit place
Fig 11. 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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