Chapter 5

0, 1 and 2. You can choose any counter to be your first cascaded counter, and the next counter would the next one in the round-robin order. For example, if you would like to cascade two 16-bit counters into one 32-bit counter, and you choose counter 1 to be the first counter then the next counter you choose should be counter 2.

Gate Types and Sources

The gate types and sources you select determine what kind of gate input signal to enable your counter/timer when receiving clock input. If the external gate input signal comes in either as logic-low or logic-high as you have preset, the counter/timer function is enabled, waiting only for the clock input signal to start counting. The PCI-1712/1712L provides two gate input types, for which user can set easily through software or write to bit GPn on register Base+20 to 24:

qLogic-low external gate input:

Enables a counter/timer operation when the external gate signal is logic-low, and disables the counter/timer operation when the external gate signal is logic-high.

qLogic-high external gate input:

Enables a counter/timer operation when the external gate signal is logic-high and disables the counter/timer operation when the external gate signal is logic-low.

The gate sources are described as below:

qSoftware Gate:

User can use software to generate the signal to be counter’s gate input. It helps user to control counter easily through software.

qPrevious Counter Output:

User can use previous counter’s output as your gate source. The previous counter of counter 0 is counter 2, of counter 1 is counter 0 and of counter 2 is counter 1.

qExternal Gate Source:

User can connect an external gate signal to screw terminal

CNTn_GATE on the PCLD-8712 screw terminal board, where n is the counter number.

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PCI-1712/1712L User’s Manual

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Konica Minolta PCI-1712L user manual Gate Types and Sources

PCI-1712L, PCI-1712 specifications

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