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General Description

Introduction

The MC68HC705E5 is a low-cost introduction to the M68HC05 Family of microcontrollers (MCUs). The HC05 central processing unit (CPU) core has been enhanced with a 15-stage multifunctional timer and programmable phase-locked loop (PLL). The MCU is available in a 28-pin package and has two 8-bit input/output (I/O) ports and one 4-bit I/O port. The 8-Kbyte memory map consists of user eraseable, programmable read-only memory (EPROM), random-access memory (RAM), bootloader ROM, and I/O.

Features

Features of the MC68HC705E5 include:

? Low Cost

? HC05 Core

? 28-Pin Package

? On-Chip Oscillator (Crystal or Ceramic Resonator)

? Phase-Locked Loop (PLL) Synthesizer with Programmable Speed

? Synchronous Serial Interface (SSI) with Interrupts and Most Significant Bit (MSB) or Least Significant Bit (LSB) First

? M-Bus (I2C) Communication Port

? 5120 Bytes of User EPROM (Including 16 Bytes of EPROM User Vectors)

? 384 Bytes of On-Chip RAM

? 15-Stage Multifunctional Timer with Programmable Input

? Real-Time Interrupt Circuit

? Computer Operating Properly (COP) Watchdog Timer Mask Option

? Custom Periodic Interrupt Circuit

? 20 Bidirectional I/O Lines

? Single-Chip Mode

? Bootloader Mode

? Power-Saving Stop and Wait Modes

? Edge-Only Sensitive or Edge- and Level-Sensitive Interrupt Trigger Mask Option

? STOP Instruction Disable Mask Option

? System Control and Status Register

? Illegal Address Reset