PCF2129T datasheet(36/73 Pages) NXP

36 / 73 page

PCF2129T

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Product data sheet

Rev. 3 — 12 February 2013

36 of 73

NXP Semiconductors

PCF2129T

Accurate RTC with integrated quartz crystal for industrial

The TSF1 and TSF2 flags can be cleared by command; clearing both flags will clear

the interrupt. Once TSF2 is cleared, it will only be set again when TS pin is driven to

ground once again.

8.11.2 Timestamp mode

The timestamp function has two different modes selected by the control bit TSM

(timestamp mode) in register Timestp_ctl:

• If TSM is logic 0 (default): in subsequent trigger events without clearing the timestamp

flags, the last timestamp event is stored

• If TSM is logic 1: in subsequent trigger events without clearing the timestamp flags,

the first timestamp event is stored

The timestamp function also depends on the control bit BTSE in register Control_3, see

Section 8.11.4.

8.11.3 Timestamp registers

8.11.3.1

[1]

Default value.

8.11.3.2

8.11.3.3

Table 38.

Timestp_ctl - timestamp control register (address 12h) bit description

Bit

Symbol

Value Description

7TSM

0[1]

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

6TSOFF

0[1]

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 39.

Sec_timestp - second timestamp register (address 13h) bit description

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

0to9

unit place

Table 40.

Min_timestp - minute timestamp register (address 14h) bit description

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

0to9

unit place

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