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