ETAS
Functional Description
ES441.1 - User Guide
39
“X1”, “X2” and “X4” Counter Modes
Every measurement channel can be assigned any other measurement channel
of the module as a qualifying channel (trigger channel) in the counter modes
“X1”, “X2” and “X4”. Some counter parameters are set by default when using the
counter modes “X1”, “X2” and “X4” and cannot be changed in the calibration
software. Depending on the selected counter mode, the input signal of the qual
-
ifying channel is evaluated and measurement controlled at the assigned mea
-
surement channel (see section 5.7.5 on page 45).
5.7.2
“Standard without Qualifying Signal” Counter Mode
In the “Standard without qualifying signal” counter mode, the signal at the mea
-
surement channel is counted regardless of signals at other measurement
channels. The counter assigned to the measurement channel is configured as
an up-counter.
In this mode, the ES441.1 can count edges with the following measurement
modes in accordance with the configuration in the calibration software:
• Counting the edges when the input signal changes from inactive to
active state
• Counting the edges when the input signal changes from active to inac
-
tive state
• Counting the edges when the input signal changes from inactive to
active state and from active to inactive state and
• Counting the cycles
The following counter operating modes can be selected in the calibration soft
-
ware for measurement modes without a qualifying signal:
• Resetting the counter after every sampling point or
• Counter in Free Running Mode. The counter counts from the start of
measuring without being reset during measuring. If the count scope
(overflow) is reached and the measurement is not yet completed, the
counter starts to count from the beginning again. The counter overflows
after 2
32
signal transitions to be counted.
The following figures show examples of the “Standard without qualifying sig
-
nal” counter mode
.
Counting the Inactive-Active Edges
Fig. 5
-
9
Counting the Inactive-Active Edges
In the example in Fig. 5
9, the counter is reset at every sampling point.
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