PCF2129AT datasheet(42/86 Pages) PHILIPS

42 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

42 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

8.11.3.3

8.11.3.4

[1]

Hour mode is set by the bit 12_24 in register Control_1.

Table 61.

Min_timestp - minute timestamp register (address 14h) 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

MINUTE_TIMESTP (0 to 59)

Reset

value

XXX

Table 62.

Min_timestp - minute timestamp register (address 14h) 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

--unused

6 to 4

MINUTE_TIMESTP

0 to 5

ten’s place

minute timestamp information coded in BCD format

3to0

0 to9

unit place

Table 63.

Hour_timestp - hour timestamp register (address 15h) 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

AMPM

HOUR_TIMESTP (1 to 12) in 12-hour mode

HOUR_TIMESTP (0 to 23) in 24-hour mode

Reset

value

XXX

Table 64.

Hour_timestp - hour timestamp register (address 15h) 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

12-hour mode[1]

AMPM

indicates AM

indicates PM

HOUR_TIMESTP

0 to 1

ten’s place

hour timestamp information coded in BCD format

when in 12-hour mode

3to0

0 to9

unit place

24-hour mode[1]

5 to 4

HOUR_TIMESTP

0 to 2

ten’s place

hour timestamp information coded in BCD format

when in 24-hour mode

3to0

0 to9

unit place

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