ETAS
Hardware Description
ETK-T2.2 User Guide
21
4.5.3
Triggering of Measurement Data Capture
The exact procedure for capturing measured data is explained in the documen
-
tation Display Tables 12 and 13; only the hardware-specific features are men
-
tioned here. The ECU microcontroller initiates a data acquisition task by writing
an arbitrary value to the trigger address at the so called trigger segment. The
software of the ECU is able to start different data acquisition tasks by writing
different trigger addresses (trigger 0 to trigger 31).
The ETK-T2.2 contains a trigger comparator which selects a segment of
256
Byte out of the measurement data memory address space (at a 256
Byte
limit). This limit is known as the trigger segment address. Fig.
Byte Trigger Segment" shows the configuration of the 256
Byte trigger
segment.
The ETK-T2.2 supports up to 32 direct hardware triggers by providing 32 trigger
addresses within the trigger segment.
Fig.
4
-
5
Division of the 256
Byte Trigger Segment
NOTE
The unused address areas within the trigger segment are reserved for future
applications and must not be used for other purposes.
trigg er 15
trigg er 14
trigg er 13
00h
74 h
78h
7Ch
RE S ERVE D
trigger 2
trigger 3
trigger 0
trigger 1
48h
44h
40h
4Ch
10h
RES ERVE D
no Fla sh->DP R
E T K_E nable
E T K _Di sable
04h
trigg er 16
80h
trigger 1 7
84h
trigg er 30
B8 h
trigger 3 1
BCh
RE SE RV ED
FFh
C0h
