Book Analog Interfacing to Embedded Microprocessors
the test range will be those from the fifth and higher harmonics of the proces-
sor clock. The higher harmonics typically have less energy. On the other hand,
a 33 MHz processor will produce energy in the test band from its fundamen-
tal frequency and higher. In addition, a faster processor clock rate means faster
logic with faster edges and correspondingly higher energy in the harmonics.
Although using a 6 MHz example in an era of 1000 MHz Pentiums may
seem archaic, it does illustrate the point. EMC concerns are a valid reason to
limit bus and processor speeds only to what is actually needed for the appli-
cation. The caution here is not to limit the design too much. If the processor
can just barely keep up with the application, there is no margin left to fix
problems or add enhancements.
Other System Considerations
Peripheral Hardware
An imaging system was having problems with lost data. This particular system
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