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PCM-3780 User Manual 58
D.13 Mode L Waveforms
Hardware-Triggered Delayed Pulse One-Shot
Mode L is similar to Mode J except that counting will not begin before a
gate edge is applied to an armed counter. The counter must be armed
before application of the triggering gate edge; gate edges applied to a dis-
armed counter are disregarded. The counter will start counting source
edges and counting will proceed until the second TC.
Note that after application of a triggering gate edge, the gate input will be
disregarded for the remainder of the count cycle. This differs from Mode
K, where the gate can be modulated throughout the count cycle to stop
and start the counter. On the first TC after application of the triggering
gate edge, the counter will be reloaded from the Hold register. On the sec-
ond TC, the counter will be reloaded from the Load register and counting
will stop until a new edge is issued to the counter. Note that unlike Mode
K, new gate edges must be altered every second TC to continue counting.
SOURCE
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
GATE
L-1 L-2 2 0
Mode L Waveforms
X L 1 H H-1 H-2 2 01 L