MC68HC705P9CS datasheet(26/160 Pages) FREESCALE

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Pin Descriptions

Technical Data

MC68HC705P9 — Rev. 4.0

Pin Descriptions

MOTOROLA

2.2 Pin Assignments

Figure 2-1. Pin Assignments

2.3 Pin Functions

2.3.1 VDD and VSS

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

from a single 5-V power supply.

Very fast signal transitions occur

on the MCU pins, placing high

short-duration current demands

on the power supply. To prevent

noise problems, take special

care to provide good power

supply bypassing at the MCU as

Figure 2-2 shows. Place the

bypass capacitors as close as

possible to the MCU. C2 is an

optional bulk current bypass capacitor for use in applications that require

the port pins to source high current levels.

RESET

IRQ/VPP

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

PB5/SDO

PB6/SDI

PB7/SCK

VSS

VDD

OSC1

OSC2

PD7/TCAP

TCMP

PD5

PC0

PC1

PC2

PC3/AN3

PC4/AN2

PC5/AN1

PC6/AN0

PC7/VRH

MCU

0.1

µF

VDD

Figure 2-2. Bypassing

Recommendation

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC705P9CS 数据表(PDF) 26 Page - Freescale Semiconductor, Inc

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