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
2
2
1
0
L-1
L-2
Mode D Waveforms
1
0
L
2
1
0
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