Measurement-computing PCM-D24/CTR3 rev.3 Manuel d'utilisateur télécharger pdf (Page 21)

This diagram shows schematically the programmable options.

Because of the limited number of pins on the 33 pin connector, all signals from all

three counters are not available externally. This is compensated for by the ability to

chain counters and control the count source.

Clock Source Select

The source for count pulses to the inputs of the clocks may be controlled via software.

The counter source will be overidden by counter linking (see below).

External Clock 2 - Supplied at pin 311

1 MHz Clock0

Clock Scource Counter 2CKSEL2

1 MHz Clock1

10 MHz Clock0

Clock Source Counter 1CHSEL1

External Clock 0 - supplied at pin 281

10MHz Clock0

Clock Source Counter 0CKSEL0

Counter Linking

Counters may be linked into 32 or 48 bit depth. Note that counter linking overrides

counter source select for counters 1 and 2.

1 2 ... 16 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 21