Product Summary

Power Supply Pins (VDD and VSS)

MC68HC908EY16 Product Summary – Rev 1.0

Motorola

Pin Functions

7

5 Pin Functions

Descriptions of the pin functions are provided here.

5.1 Power Supply Pins (VDD and VSS)

VDD and VSS are the power supply and ground pins. The MCU operates

from a single power supply.

Fast signal transitions on MCU pins place high, short-duration current

demands on the power supply. To prevent noise problems, take special

care to provide power supply bypassing at the MCU as Figure 3 shows.

Place the C1 bypass capacitor as close to the MCU as possible. Use a

high-frequency-response ceramic capacitor for C1. C2 is an optional

bulk current bypass capacitor for use in applications that require the port

pins to source high current levels.

Figure 3. Power Supply Bypassing

MCU

VDD

C2

C1

0.1

µF

VSS

VDD

+

Note: Component values shown represent typical applications.

Freescale Semiconductor, Inc.

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