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Why does the readout value of the counter/timers when used as a logic analyzer trigger event appear incorrect even though the logic analyzer triggered correctly?

Вопрос :

Why does the readout value of the counter/timers when used as a logic analyzer trigger event appear incorrect even though the logic analyzer triggered correctly?

Ответ :

Under certain conditions, when a counter/timer is used as a logic analyzer trigger event, the readout value displayed in the Status Monitor is incorrect even though the logic analyzer triggered correctly.

The problem occurs under the following conditions:

The target value of the counter is less than 8 (or the target value of the timer is less than 32 ns); the counter/timer is incremented past the target value; and the counter is reset (or the timer is cleared).

If you need to see the above counter/timer values in the Status Monitor or if you need to use the target values in the Histogram window or with a TPI application, use a second counter/timer in parallel with the first counter/timer, but do not use it in a trigger event. The readout value of the second counter/timer will be correct.


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