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
