Advantech PCM-3780 manual Mode G Waveforms, Software-Triggered Delayed Pulse One-Shot

D.8 Mode G Waveforms

Software-Triggered Delayed Pulse One-Shot

In Mode G, the gate does not affect the counter's operation. Once armed, the counter will count to TC twice and then automatically disarm itself. For most applications, the counter will initially be loaded from the Load register either by a LOAD command or by the last TC of an earlier timing cycle.

Upon counting to the first TC, the counter will reload itself from the Hold register. Counting will proceed until the second TC, when the counter will reload itself from the Load register and automatically disarm itself, inhibiting further counting. Counting can be resumed by issuing a new ARM command.

Specifying the TC Toggled output mode in the Counter Mode register may generate a software-triggered delayed pulse one-shot. The initial counter contends control of the delay from the ARM command until the output pulse starts. The Hold register contents control the pulse duration.

SOURCE

WR

ARM

COMMAND

COUNT

X

L

L-1

L-2

2

1

0

H

H-1

H-2

2

1

0

L

VALUE

TC OUTPUT

TC TOGGLED

OUTPUT

Mode G Waveforms

53 AppendixD