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2-10
Functional Description
Pulse Length
The period of the output pulse is equal to the prescaler value. Since the
prescaler generates a square wave, the length of the output pulse is equal
to half of the prescaler value. For example, if the prescaler value is 10 ms,
the length of the output pulse is 5ms.
Figure 2-3 illustrates a falling-edge output pulse that is 5ms in length
(prescaler value is 10ms) and is generated 30ms after the analog output
channels on the quad DACs in the update group are updated. Since there
is only one prescaler, the prescaler value must be 10ms for both the pacer
clock and the output clock.
Figure 2-3. Generating an Output Clock Pulse
50ms
30ms
time
delay
20
ms
50ms
45ms
5ms output pulse
Pacer Clock
Prescaler = 10ms
Counter value = 5
Pacer clock
counter loaded
50ms
First update of
the channels
Output Clock
Falling-edge pulse
First output
clock pulse
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