PCF2127ATSLASH1 datasheet(42/80 Pages) NXP

42 / 80 page

PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

42 of 80

NXP Semiconductors

PCF2127A

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 TS pin is

driven to ground once again.

8.12.2 Time stamp 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 8.12.4.

8.12.3 Timestamp registers

8.12.3.1

[1]

Default value.

8.12.3.2

8.12.3.3

Table 45.

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 46.

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 47.

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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