PCF2123BS/1 NXP Semiconductors, PCF2123BS/1 Datasheet - Page 15

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

Specifications of PCF2123BS/1

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
PCF2123
Product data sheet
8.4.7 Register Years
8.4.8 Setting and reading the time
Table 16.
Table 17.
Figure 10
Month
January
February
March
April
May
June
July
August
September
October
November
December
Bit
7 to 4
3 to 0
Fig 10. Data flow of the time function
Symbol
YEARS
shows the data flow and data dependencies starting from the 1 Hz clock tick.
Month assignments in BCD format
Years - years register (08h) bit description
Upper-digit
(ten’s place)
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
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12_24 hour mode
Rev. 5 — 27 April 2011
CALCULATION
LEAP YEAR
Digit (unit place)
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
Value
0 to 9
0 to 9
SECONDS
MINUTES
MONTHS
1 Hz tick
HOURS
YEARS
DAYS
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
Place value Description
ten’s place
unit place
WEEKDAY
actual year coded in BCD format
SPI Real time clock/calendar
001aaf901
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
PCF2123
© NXP B.V. 2011. All rights reserved.
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
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