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
8.8.6 Register Months
Table 23. Months - months register (address 08h) bit description
Bit Symbol
Value Place value Description
7 to 5 -
-
-
unused
4
MONTHS
3 to 0
0 to 1
0 to 9
ten’s place actual month coded in BCD format, see
unit place Table 24
Table 24. Month assignments in BCD format
Month
Upper-digit Digit (unit place)
(ten’s place)
Bit 4
Bit 3
Bit 2
January
0
0
0
February
0
0
0
March
0
0
0
April
0
0
1
May
0
0
1
June
0
0
1
July
0
0
1
August
0
1
0
September 0
1
0
October
1
0
0
November
1
0
0
December
1
0
0
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
8.8.7 Register Years
Table 25. Years - years register (address 09h) 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
8.8.8 Setting and reading the time
Figure 13 shows the data flow and data dependencies starting from the 1 Hz clock tick.
During read/write operations, the time counting circuits (memory locations 03h through
09h) are blocked.
This prevents
• Faulty reading of the clock and calendar during a carry condition
• Incrementing the time registers during the read cycle
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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