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INTRODUCTION

The MC68HC05J3, with 2kbytes of ROM is a member of the Motorola M68HC05 family of HCMOS 8-bit single chip microcomputers. Based on the industry-standard M68HC05 CPU core and its familiar, efficient instruction set, this device provides a cost effective, low pin-count microcomputer solution suitable for use in a wide variety of application areas, including car body electronics. The keyboard interrupt function, which shares 4 I/O lines of port B, provides a simple interface to keypads, switches and other similar input media. In addition, the port pins are capable of sinking a current of 8mA at 0.8V and can therefore be used to drive certain LED’s.

Features

? Fully static design featuring the industry standard M68HC05 core

? On-chip oscillator with crystal, resistor, external clock or ceramic resonator connection

? 2048 bytes of User ROM

? 128 bytes of RAM

? Power saving STOP and WAIT modes

? 16-bit programmable timer with input capture and output compare functions

? 8-bit multi-purpose timer

? Real time interrupt circuit

? Computer operating properly watchdog timer (mask option)

? Interrupt request input (IRQ), plus four on-chip hardware interrupt sources

? Keyboard interrupt feature on four port B input/output lines

? One 8-bit and one 6-bit parallel I/O port (two lines on port B are shared with the 16-bit timer)

? All port pins are capable of sinking a current of 8mA at 0.8V

? Available in 20-pin plastic SOIC and 20-pin plastic DIL packages