PCF2127AT datasheet(50/100 Pages) PHILIPS

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PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

50 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

8.12.3 Timestamp registers

8.12.3.1

8.12.3.2

Table 67.

Timestp_ctl - timestamp control register (address 12h) 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

TSM

TSOFF

1_O_16_TIMESTP[4:0]

Reset

value

XXX

Table 68.

Timestp_ctl - timestamp control register (address 12h) 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

Description

TSM

in subsequent events without clearing the timestamp

flags, the last event is stored

in subsequent events without clearing the timestamp

flags, the first event is stored

TSOFF

timestamp function active

timestamp function disabled

unused

4 to 0

1_O_16_TIMESTP[4:0]

1⁄16 second timestamp information coded in BCD

format

Table 69.

Sec_timestp - second timestamp register (address 13h) 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

SECOND_TIMESTP (0 to 59)

Reset

value

XXX

Table 70.

Sec_timestp - second timestamp register (address 13h) 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

SECOND_TIMESTP

0 to 5

ten’s place

second timestamp information coded in BCD format

3to0

0 to9

unit place

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