pcf2127a NXP Semiconductors, pcf2127a Datasheet - Page 42

• Manufacturer Part Number: pcf2127a
• Description: Integrated Rtc, Tcxo And Quartz Crystal
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF2127A_1
Product data sheet
8.12.3.1 Register Timestp_ctl
8.12.3.2 Register Sec_timestp
8.12.3.3 Register Min_timestp
8.12.2 Time stamp mode
8.12.3 Timestamp registers
The timestamp function has two different modes selected by the control bit TSM
(timestamp mode) in register Timestp_ctl:
The timestamp function also depends on the control bit BTSE (battery switch timestamp
enable) in register Control_3, see
Table 45.
[1]
Table 46.
Table 47.
Bit
7
6
5
4 to 0 1_O_16_TIMESTP[4:0]
Bit
7
6 to 4 SECOND_TIMESTP 0 to 5
3 to 0
Bit
7
6 to 4 MINUTE_TIMESTP
3 to 0
•
•
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 is driven
to ground once again.
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
Default value.
Symbol
TSM
TSOFF
-
Symbol
-
Symbol
-
Timestp_ctl - timestamp control register (address 12h) bit description
Sec_timestp - second timestamp register (address 13h) bit description
Min_timestp - minute timestamp register (address 14h) bit description
Rev. 01 — 21 January 2010
Value
-
0 to 9
Value
-
0 to 5
0 to 9
Value Description
0
1
0
1
-
[1]
[1]
Section
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
timestamp function active
timestamp function disabled
unused
1
⁄
Place value Description
-
ten’s place
unit place
Place value Description
-
ten’s place
unit place
16
second timestamp information coded in BCD format
8.12.4.
Integrated RTC, TCXO and quartz crystal
unused
second timestamp information coded in
BCD format
unused
minute timestamp information coded in
BCD format
PCF2127A
© NXP B.V. 2010. All rights reserved.
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