PCF2129AT datasheet(43/86 Pages) PHILIPS

43 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

43 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.11.3.5

8.11.3.6

8.11.3.7

Table 65.

Day_timestp - day timestamp register (address 16h) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

DAY_TIMESTP (1 to 31)

Reset

value

XXX

Table 66.

Day_timestp - day timestamp register (address 16h) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

Value

Place value Description

7to6

unused

5 to 4

DAY_TIMESTP

0 to 3

ten’s place

day timestamp information coded in BCD format

3to0

0 to9

unit place

Table 67.

Mon_timestp - month timestamp register (address 17h) bit allocation

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

MONTH_TIMESTP (1 to 12)

Reset

value

XXX

Table 68.

Mon_timestp - month timestamp register (address 17h) bit description

Bit positions labeled as - are not implemented and return 0 when read. Bits labeled as X are undefined at power-on and

unchanged by subsequent resets.

Bit

Symbol

Value

Place value Description

7to5

unused

MONTH_TIMESTP

0 to 1

ten’s place

month timestamp information coded in BCD format

3to0

0 to9

unit place

Table 69.

Year_timestp - year timestamp register (address 18h) bit allocation

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

Bit

Symbol

YEAR_TIMESTP (0 to 99)

Reset

value

XXX

Table 70.

Year_timestp - year timestamp register (address 18h) 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

YEAR_TIMESTP

0 to 9

ten’s place

year timestamp information coded in BCD format

3to0

0 to9

unit place

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