your position is our focus
4.7.3 Timemark
This section only applies to LEA-4T modules.
®
s
with
a
sub
millisecond
resolution
using
the
external
ANTARIS 4
GPS
Receiver
can
be
used
for
time
measurement
interrupt
(EXTINT0).
The
Timemark
function
can
be
enabled
with
UBX
–
CFG
–
TM
(for
firmware
version
<5.00)
or
UBX
–
CFG
–
TM2
(for
firmware
version
≥
5.00).
The
results
are
transmitted
via
serial
port
with
the
UBX
–
TIM
–
TM/TM2
messages
including
time
of
the
last
Timemark
time
source,
validity,
number
of
marks,
delta
time
and
a
quantization
error.
UTC 8:30:01.234
UTC 8:30:00.000
UTC 8:30:02.234
EXTINT0
(neg Edge)
Time of last mark
Delta Time
Time Source
Nr. of marks
wno:117014.000
1'234 ms
UTC
n
wno:117014.000
1'000 ms
UTC
n+1
Figure 90: Timemark example
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Receiver
Description
GPS.G4-MS4-05007-A1
Page 114
