PCF2127ATSLASH1 datasheet(30/80 Pages) NXP

30 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

30 of 80

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

8.9.6 Register Months

8.9.7 Register Years

8.9.8 Setting and reading the time

Figure 17 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

Table 26.

Months - months register (address 08h) bit description

Bit

Symbol

Value

Place value Description

7to5 -

unused

MONTHS

0 to 1

ten’s place

actual month coded in BCD format, see

Table 27

3to0

0to9

unit place

Table 27.

Month assignments in BCD format

Month

Upper-digit

(ten’s place)

Digit (unit place)

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

January

February

March

April

100

May

101

June

110

July

111

August

000

September

October

000

November

001

December

010

Table 28.

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

3to0

0to9

unit place

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