Datasheet
PCF85063TP All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 3 — 11 July 2013 20 of 47
NXP Semiconductors
PCF85063TP
Tiny Real-Time Clock/calendar
8.3.7 Register Years
[1] Default value.
8.4 Setting and reading the time
Figure 11 shows the data flow and data dependencies starting from the 1 Hz clock tick.
During read/write operations, the time counting circuits (memory locations 04h through
0Ah) are blocked.
The blocking prevents
• Faulty reading of the clock and calendar during a carry condition
• Incrementing the time registers during the read cycle
After this read/write access is completed, the time circuit is released again and any
pending request to increment the time counters that occurred during the read/write access
is serviced. A maximum of 1 request can be stored; therefore, all accesses must be
completed within 1 second (see Figure 12
).
Table 28. Years - years register (0Ah) bit description
Bit Symbol Value Place value Description
7 to 4 YEARS 0
[1]
to 9 ten’s place actual year coded in BCD format
3to0 0
[1]
to 9 unit place
Fig 11. Data flow for the time function
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