PCF2129T View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PCF2129T' PDF : 73 Pages View PDF
NXP Semiconductors
PCF2129T
Accurate RTC with integrated quartz crystal for industrial
8.8.3 Register Hours
Table 19. Hours - hours register (address 05h) bit description
Bit Symbol
Value Place value Description
7 to 6 -
-
-
unused
12 hour mode[1]
5
AMPM
0
-
indicates AM
1
-
indicates PM
4
HOURS
3 to 0
0 to 1
0 to 9
ten’s place actual hours coded in BCD format when in
unit place 12 hour mode
24 hour mode[1]
5 to 4 HOURS
3 to 0
0 to 2
0 to 9
ten’s place actual hours coded in BCD format when in
unit place 24 hour mode
[1] Hour mode is set by the bit 12_24 in register Control_1.
8.8.4 Register Days
Table 20. Days - days register (address 06h) bit description
Bit Symbol
Value Place value Description
7 to 6 -
-
-
unused
5 to 4 DAYS[1]
0 to 3
ten’s place actual day coded in BCD format
3 to 0
0 to 9
unit place
[1] If the year counter contains a value which is exactly divisible by 4, including the year 00, the RTC
compensates for leap years by adding a 29th day to February.
8.8.5 Register Weekdays
Table 21. Weekdays - weekdays register (address 07h) bit description
Bit Symbol
Value Description
7 to 3 -
-
unused
2 to 0 WEEKDAYS
0 to 6 actual weekday value, see Table 22
Although the association of the weekdays counter to the actual weekday is arbitrary, the
PCF2129T will assume that Sunday is 000 and Monday is 001 for the purposes of
determining the increment for calendar weeks.
Table 22. Weekday assignments
Day[1]
Bit
2
1
0
Sunday
0
0
0
Monday
0
0
1
Tuesday
0
1
0
Wednesday
0
1
1
Thursday
1
0
0
Friday
1
0
1
Saturday
1
1
0
[1] Definition may be reassigned by the user.
PCF2129T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 12 February 2013
© NXP B.V. 2013. All rights reserved.
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