68HC705JB2 datasheet(16/128 Pages) NXP

16 / 128 page

GENERAL RELEASE SPECIFICATION

August 28, 1998

GENERAL DESCRIPTION

MC68HC705JB2

1-4

REV 1.1

Figure 1-2. Pin Assignments for 20-Pin Package

1.4

FUNCTIONAL PIN DESCRIPTIONS

The following paragraphs give a description of the general function of each pin

assigned in Figure 1-2.

1.4.1 VDD, VSS

Power is supplied to the MCU through VDD and VSS. VDD is the positive supply,

and VSS is ground. The MCU operates from a single power supply.

Very fast signal transitions occur on the MCU pins. The short rise and fall times

place very high short-duration current demands on the power supply. To prevent

noise problems, special care should be taken to provide good power supply

bypassing at the MCU by using bypass capacitors with good high-frequency

characteristics that are positioned as close to the MCU as possible. Bypassing

requirements vary, depending on how heavily the MCU pins are loaded.

1.4.2 OSC1, OSC2

The OSC1 and OSC2 pins are the connections for the on-chip oscillator. The

OSC1 and OSC2 pins can accept the following sets of components:

RESET

PA0

PA1

PA2

PA3

PA4

PB0/TCAP

PB1

VDD

OSC1

OSC2

VSS

3.3V

D+

D–

PA7

PA6

PA5

IRQ/VPP

PB2

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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