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PCM-3780 User Manual 54
D.9 Mode H Waveforms
Software-Triggered Delayed Pulse One-Shot with Hardware Gating
Mode H is identical to Mode G except that the gate input is used to qual-
ify which source edges are to be counted. The counter must be armed for
counting to occur. Once armed, the counter will count all source edges
that occur while the gate is active and disregard those source edges that
occur while the gate is inactive. This permits the gate to turn the count
process on and off.
As with Mode G, the counter will be reloaded from the Hold register on
the first TC and reloaded from the Load register and disarmed on the sec-
ond TC. This mode allows the Gate to control the extension of both the
initial output delay time and the pulse width.
SOURCE
WR
ARM
COMMAND
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
Mode H
Waveforms
GATE
X L L- 1 L- 2 K+1 K K-1 2 1 0 H H-1 H-2 N+1
SOURCE
WR
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
GATE
N+1 N N-1 2 1 0 L