AN1746 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

AN1746

Migrating from the MC68HC705K1 to the MC68HC705KJ1

Freescale Semiconductor 

Application Note

Freescale Semiconductor, Inc.

For information on migrating your design to the K3, consult the

application note titled Migrating from the MC68HC705K1 to the

MC68HC805K3, Freescale document order number AN1747/D.

MC68HC705KJ1

Features

• 1240 bytes of user EPROM

• 64 bytes of low-power user RAM

• 4-MHz maximum internal bus frequency at 5 volts

• 15-stage multifunction timer

• COP watchdog timer

• 10 bidirectional input/output (I/O) pins, including:

– 10-mA sink capability on all I/O pins

– 5.5-mA source capability on six I/O pins

– Software programmable pulldowns on all I/O pins

– Keyboard scan with selectable interrupt on four I/O pins

• Selectable sensitivity on external interrupt; edge- and level-

sensitive or edge-sensitive only

• On-chip oscillator with options for:

– Crystal

– Ceramic resonator

– Resistor-capacitor (RC) oscillator (MC68HRC705KJ1) with or

without external resistor

– Low-speed (32 kHz) crystal (MC68HLC705KJ1)

– External clock

• External interrupt mask bit and acknowledge bit

• EPROM security bit1 to aid in locking out access to programmable

EPROM array

• Selectable STOP conversion to HALT and option for fast restart

and power-on reset

• Internal steering diode and pullup device on RESET pin to VDD

1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or

copying the EPROM/OTPROM difficult for unauthorized users.

AN1746

For More Information On This Product,

Go to: www.freescale.com

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