Software to Control Specific MCU Functions
Many times, the source of the difficulty can be understood,
or at least the testing made easier, if the microcomputer controlling the
network node can be programmed to independently control specific functions.
These functions may then be performed repetitively or exclusively, or not
performed at all, and the effect on the EMC problem noted. Common functions
useful to EMC problem investigations are
-
Constant toggling of actuators; activation and deactivation
of sensors
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Writing to displays
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Reading and writing to memory (especially external
memory)
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Controlling pad drivers on microcontroller ports (turning
them on and off; varying their drive capability)
-
Toggling external buses with 1–0 data patterns
-
Continuous synthesized bus, alarm, and display backlight
operation
This topic should be
discussed at the beginning of the product development program because
"throwaway," or nonshippable, code will have to be written.
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