Advantech PC-LabCard PCI-1784 Instrukcja Użytkownika Pobierz pdf (Strona 59)

D.4 Mode D waveform

Rate Generator with No Hardware Gating

Mode D is typically used in frequency generation applications. In this

mode, the Gate input does not affect counter operation. Once armed, the

counter will count to TC repetitively. On each TC the counter will

reload itself from the Load register; hence the Load register value

determines the time between TCs. A square wave rate generator may be

obtained by specifying the TC Toggled output mode in the Counter

Mode register.

SOURCE

COUNT

VALUE

TC OUTPUT

TC TOGGLED

OUTPUT

L L-1 L-2 22 1

0 L-1 L-2

Mode D Waveforms

1 0 L 2 1 0

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 70 71

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Advantech PC-LabCard PCI-1784 Instrukcja Użytkownika Strona 59