Renesas M16C FAMILY Bedienungsanleitung PDF herunterladen (Seite 11)

Conventional

MCU

Conventional MCU-based circuit board

Control signal

lines protected

with noise filters

and capacitors

Power supply

ferrite beads placed

on the VCC pin

M16C-based circuit board

Capacitors

and resistors

unnecessary

■ REASON #5: QUIET

Peripheral buffer power supply

Internal logic power supply

nalog circuit power supply

Noise

Vcc

GND

Absorbed as

common-mode noise

Parasitic capacitor

Wiring inductance

M16C

Noise Filter

External to

the chip

Internal

Input Port

Clamp

diode

Clamp diode

Top Reasons to Select the M16C Platform

™

Excellent EMI and EMS Performance

The M16C family of MCUs incorporates various design techniques that help minimize EMI and EMS effects. Innovative

layout schemes and built-in

components make the M16C

robust and can significantly

reduce the total system cost

by eliminating external filter

circuits (e.g., decoupling

capacitors) typically needed

by conventional MCUs.

Low Noise Emissions

M16C MCU devices are designed to minimize switching noise, improving EMI performance.

The clock driving circuit can be configured for high- or low-level drive according to the system crystal.

Internal oscillators also help reduce

the overall noise emission. Port-

output buffers have been tuned to

drive at the appropriate voltage

levels and switching timing is

controlled to minimize current

spiking.

Comparison of Noise Emissions (Field Probe Test)

왎 M16C/62P

Supply voltage: 5V

Oscillation frequency:

24MHz (PLL)

왎 Conventional MCU

Supply voltage: 5V

Oscillation frequency:

20MHz (PLL)

High Immunity to Noise

All input pins include Schmitt trigger, RC circuits

and clamp diodes, providing analog filtering and

protection for all external signals. For functions

such as input capture, additional digital filters are

implemented.

Innovative Chip Layout

Reduces Noise

Location of Vcc and Vss pins is optimized for best

effect of bypass capacitor. Internal parasitic

capacitors provide further protection against noise.

Layout of MCU’s supply planes is isolated to reduce

noise propagation.

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