Measurement-computing PCM-D24/CTR3 rev.3 Manuel d'utilisateur télécharger pdf (Page 22)

CK1 CK0 Counter Linking

0 0 3, 16 bit counters

0 1 1, 16 bit counter (counter 0), AND

1, 32 bit counter (counter 1 cascaded into counter 2)

1 0 1, 48 bit counter (counter 0 to counter 1 to counter 2)

1 1 Not defined

Counter Gates

The counter gates are tied high through a 10K resistor. In this manner the gates are

always enabled; counting is always enabled. Counters 0 and 2 may be disabled by

bringing the gates to ground at pin 27 (CTR1 Gate) and pin 30 (CTR3 Gate). Counter

1 has no external access to the gate so counter 1 is always enabled.

1 2 ... 17 18 19 20 21 22 23 24 25 26

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Measurement-computing PCM-D24/CTR3 rev.3 Manuel d'utilisateur Page 22