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INTRODUCTION

The MC68HC705J2 is a member of the low-cost, high-performance M68HC05 Family of 8-bit microcontroller units (MCUs). The high-density, complementary metal-oxide semiconductor (HCMOS) M68HC05 Family is based on the customer-specified integrated circuit (CSIC) design strategy. All MCUs in the family use the popular M68HC05 central processor unit (CPU) and are available with a variety of subsystems, memory sizes and types, and package types. The MC68HC705J2 is an expansion of the MC68HC05J1 design. On-chip memory is enhanced with 2 Kbytes of erasable, programmable ROM (EPROM), 112 Kbytes of RAM, and a bootloader ROM.

Features

The MCU features include the following:

? Popular M68HC05 CPU

? Memory-Mapped Input/Output (I/O) Registers

? 2064 Bytes of User EPROM Including 16 User Vector Locations

? 112 Bytes of Static RAM (SRAM)

? 14 Bidirectional I/O Pins

? Fully Static Operation With No Minimum Clock Speed

? On-Chip Oscillator With Crystal/Ceramic Resonator Connections

? 15-Bit Multifunction Timer

? Real-Time Interrupt Circuit

? Bootloader ROM

? Power-Saving STOP, WAIT, and Data Retention Modes

? MC68HC05J1 Emulation Mode

? Selectable Edge-Sensitive or Edge- and Level-Sensitive External Interrupt Trigger

? Selectable Computer Operating Properly (COP) Timer

? 8 x 8 Unsigned Multiply Instruction

? One Time Programmable 20-Pin Dual-in-Line Package (DIP)