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57 Appendix D
D.12 Mode K Waveforms
Variable Duty Cycle Rate Generator with Level Gating
Mode K is identical to Mode J except that source edges are only counted
when the Gate is active. 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 J, the reload source used will alternate on each TC, starting
with the Hold register on the first TC. After the gate modulate the duty
cycle of the output waveform. It can affect both the high and low portions
of the output waveform.
SOURCE
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
Mode K
Waveforms
GATE
H H-1 H-2 K+1 K K-1 2 0 L L-1 L-2 N+1
SOURCE
COUNT
VALUE
TC OUTPUT
TC TOGGLED
OUTPUT
GATE
N+1 N N-1 2 1 0 H
2 1 0 1
H-1 H-2