PCA2129TSLASHQ900SLASH2 datasheet(30/84 Pages) NXP

30 / 84 page

PCA2129

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Product data sheet

Rev. 5 — 19 December 2014

30 of 84

NXP Semiconductors

PCA2129

Automotive accurate RTC with integrated quartz crystal

8.8.7 Register Years

8.8.8 Setting and reading the time

Figure 14 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

After this read/write access is completed, the time circuit is released again. 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 15).

Table 36.

Years - years register (address 09h) bit allocation

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

YEARS (0 to 99)

Reset

value

XXX

Table 37.

Years - years register (address 09h) bit description

Bits labeled as X are undefined at power-on and unchanged by subsequent resets.

Bit

Symbol

Value

Place value Description

7 to 4

YEARS

0 to 9

ten’s place

actual year coded in BCD format

3to0

0 to9

unit place

Fig 14. Data flow of the time function

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