Advantech PC-LabCard PCI-1784 Manual do Utilizador descarregar pdf (Página 60)

D.5 Mode E waveform

Rate Generator with Level Gating

Mode E is identical to Mode D, except the counter will only count those

source edges that occur while the Gate input is active. This feature

allows the counting process to be enabled and disabled under hardware

control. A square wave rate generator may be obtained by specifying the

TC Toggled output mode.

SOURCE

COUNT

VALUE

TC OUTPUT

TC TOGGLED

OUTPUT

GATE

2 L-1 L-2 K+1 K-1 2 1 0 L

Mode E Waveforms

1 0 L K

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 70 71

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Advantech PC-LabCard PCI-1784 Manual do Utilizador Página 60