PCF2129AT datasheet(34/68 Pages) NXP

34 / 68 page

PCF2129A_1

Product data sheet

Rev. 01 — 13 January 2010

34 of 68

NXP Semiconductors

PCF2129A

Integrated RTC, TCXO and quartz crystal

The TSF1 and TSF2 flags can be cleared by using the interface; clearing both flags

will clear the interrupt. Once TSF2 is cleared it will only be set again when pin TS 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 (battery switch timestamp

enable) 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 37.

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]

⁄

16 second timestamp information coded in BCD format

Table 38.

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 39.

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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