Horner-apg XL4 OCS Manual do Utilizador descarregar pdf (Página 51)

MAN0964-01-EN CH.11

June 29, 2012 Page 51 of 122

Width High 1 µs Counts – In this sub-mode the accumulator value will contain the number of 1 µs

counts the pulse is high.

Width Low 1 µs Counts - In this sub-mode the accumulator value will contain the number of 1 µs counts

the pulse is low.

11.3.4 Period Measurement

In period measurement mode, the high-speed input can measure the period of a pulse stream in

one of two modes and provides a continuous indication of the last sampled value. In this mode

the Disable and Latch special functions are allowed. Please see section 11.2 for a description of

these functions.

Period Rising Edges 1 µs Counts – In this sub-mode the period of the input signal is reported in

one (1) µs units. The period measurement will start on the rising edge of the input.

Period Falling Edges 1 µs Counts – In this sub-mode the period of the input signal is reported in

one (1) µs units. The period measurement will start on the falling edge of the input.

11.2.5 Quadrature

Quadrature mode uses two HSC inputs, any of the four HSC inputs can be assigned for this

purpose.

Quadrature mode works much like the totalizer except the accumulator will automatically

increment or decrement based on the rotation phase of the two inputs. See the following

example for more details. Quadrature inputs are typically used for reporting the value of an

encoder.

Width High

Width Low

Period from Rising Edge

Period from Falling Edge

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Horner-apg XL4 OCS Manual do Utilizador Página 51