Features

Features on the MC68HC705KJ1 include:

• Robust noise immunity

• 4.0-MHz internal operating frequency at 5.0 V

• 1240 Bytes of EPROM/OTPROM (electrically programmable read-only memory/one-time

programmable read-only memory), including eight bytes for user vectors

• 64 bytes of user RAM

• Peripheral modules:

– 15-stage multifunction timer

– Computer operating properly (COP) watchdog

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

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

– Software programmable pulldowns on all I/O pins

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

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

• Selectable sensitivity on external interrupt (edge- and level-sensitive or edge-sensitive only)

• On-chip oscillator with connections for:

– Crystal

– Ceramic resonator

– Resistor-capacitor (RC) oscillator (MC68HRC705KJ1) with or without external resistor

– External clock

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

• Memory-mapped I/O registers

• Fully static operation with no minimum clock speed

• Power-saving stop, halt, wait, and data-retention modes

• External interrupt mask bit and acknowledge bit

• Illegal address reset

• Internal steering diode and pullup resistor from RESET pin to VDD

• Selectable EPROM security(1)

• Selectable oscillator bias resistor