M68HC08 datasheet(31/408 Pages) MOTOROLA

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General Description

Pin Functions

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

General Description

Figure 1-3. DIP And SOIC Pin Assignments

1.6 Pin Functions

Descriptions of the pin functions are provided here.

1.6.1 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 1-4

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.

CGMXFC

OSC2

OSC1

RST

PTE0/TxD

PTE1/RxD

IRQ

PTD0/SS

PTD1/MISO

PTD2/MOSI

PTD3/SPSCK

PTD4/T1CH0

VSSA

VDDA

PTA3/KBD3

PTA2/KBD2

PTA1/KBD1

PTA0/KBD0

VSSAD/VREFL

VDDAD/VREFH

PTB3/AD3

PTB2/AD2

PTB1/AD1

PTB0/AD0

PTD6/T2CH0

PTD5/T1CH1

NOTE: Ports PTB4, PTB5, PTC0, and PTC1 are available only with the QFP.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

M68HC08 Datasheet(PDF) 31 Page - Motorola, Inc

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