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Electromagnetic Noise Reduction Slide 38

Another recommendation concerns connections to peripheral ICs. Renesas M16C MCUs only drove the external bus when the peripheral chip is actually being addressed. But some other types of MCUs continuously generate new addresses in memory-expansion mode. If your MCU does so, use port mode instead of bus mode if you must connect the microcontroller to external peripheral devices that aren’t accessed very often. This will eliminate unnecessary voltage alternations on the bus line that radiate noise because in port-mode, the connecting lines are activated only when the MCY accesses the peripheral device.

PTM Published on: 2011-11-02