Application Note

AN1746

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 array

• Selectable STOP conversion to HALT and option for fast restart

and power-on reset

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

copying the EPROM/OTPROM difficult for unauthorized users.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com