pca2125 NXP Semiconductors, pca2125 Datasheet - Page 11

• Manufacturer Part Number: pca2125
• Description: Spi Real Time Clock / Calendar Semiconductors
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA2125_00
Preliminary data sheet
Table 13.
[1]
Table 14.
[1]
Although the association of the weekdays counter to the actual weekday is arbitrary, the
PCA2125 will assume ‘Sunday’ is 000 and ‘Monday’ is 001 for the purposes of
determining the increment for calendar weeks.
Table 15:
Table 16.
Table 17:
Bit
5 to 0
Bit
2 to 0
Day
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Bit
4 to 0
Month
January
February
March
April
May
June
July
August
September
October
November
December
The RTC compensates for leap years by adding a 29th day to February if the year counter contains a value
which is exactly divisible by 4, including the year 00.
These bits may be re-assigned by the user.
Days (address 05
Weekdays (address 06
Weekday assignments
Months (address 07
Month assignments
Symbol
days
Symbol
weekdays 0 to 6
Symbol
month
Bit 7
x
x
x
x
x
x
x
Bit 7
x
x
x
x
x
x
x
x
x
x
x
x
Rev. 00.11 — 30 January 2007
Value
01 to 31
Value
Value
01 to 12
Bit 6
x
x
x
x
x
x
x
Bit 6
x
x
x
x
x
x
x
x
x
x
x
x
HEX
HEX
) bits description
HEX
) bits description
[1]
[1]
Bit 5
x
x
x
x
x
x
x
Bit 5
x
x
x
x
x
x
x
x
x
x
x
x
) bits description
Description
this register holds the current day coded in BCD format
Description
this register holds the current weekday, see
Description
this register holds the current month coded in BCD
format, see
Bit 4
x
x
x
x
x
x
x
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
Table 17
Bit 3
x
x
x
x
x
x
x
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
SPI Real time clock / calendar
Bit 2
0
0
0
0
1
1
1
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
PCA2125
© NXP B.V. 2007. All rights reserved.
Bit 1
0
0
1
0
0
1
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
1
Table 15
Bit 0
0
1
0
1
0
1
0
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
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