USB5841 Data Acquisition
This allows the sequence to be ‘‘retriggered’ by software. OUT strobe low N+1 CLK pulses after
the new count of N is written.
Figure 5.5 Mode 4
MODE 5 Hardware triggered strobe
OUT will initially be high. Counting is triggered by a rising edge of GATE. When the initial count has expired, OUT
will go low for one CLK pulse and then go high again.
After writing the Control Word and initial count, the counter will not be loaded until the CLK pulse after a trigger. This
CLK pulse does not decrement the count, so for an initial count of N, OUT does not strobe low until N+ 1 pulse after a
trigger.
A trigger results in the Counter being loaded with the initial count on the next CLK pulse. The counting sequence is
retriggerable. OUT will not strobe low for N+1 CLK pulses after any trigger. GATE has no effect on OUT.
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