Àû²©¡¤(¼¯ÍÅ)ÓÐÏÞ¹«Ë¾¹ÙÍø

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:

¨C 15-stage multifunction timer

¨C Computer operating properly (COP) watchdog

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

¨C 10-mA sink capability on all I/O pins

¨C Software programmable pulldowns on all I/O pins

¨C Keyboard scan with selectable interrupt on four I/O pins

¨C 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:

¨C Crystal

¨C Ceramic resonator

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

¨C External clock

¨C 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