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Introduction

The Freescale MC68HC705MC4 microcontroller is a low-cost M68HC05 Family EPROM microcontroller intended for use in industrial motor control and power supply applications. Features include a 2-channel, 8-bit, high-speed pulse-width modulator (PWM) module (including a commutation multiplexer for brushless permanent magnet motor control), a 6-input, 8-bit analog-to-digital (A/D) controller to accommodate analog feedback signals, and a serial communications interface (SCI) to support multi-controller networking.

Features

Features of the MC68HC705MC4 are listed below. Note that all timing is based on a 3-MHz bus.

? Low-Cost, HC05 Core Running at 3-MHz Bus Speed at VDD = 5 V ± 10

? 28-Pin Plastic Dual In-Line Package (PDIP), Small Outline Integrated Circuit (SOIC), or Windowed Ceramic Package with Low Electromagnetic Interference (EMI) Emission Pinout

? 3584 Bytes of User EPROM, Including Eight User Vectors of Two Bytes Each

? 176 Bytes of User RAM

? Dual-Channel, High-Speed PWM, Featuring:

– 8-Bit Duty Cycle Resolution

– Independent Prescaler Frequency Selection and Period Counters

– Two Frequency Ranges, Eight Steps in Each: 183 Hz to 23.4 kHz 122 Hz to 15.6 kHz

– Software Programmable PWM Polarity

– Dual Software Controllable PWM Output Multiplexer, Each PWM to Three Input/Output (I/O)

? 8-Bit A/D Converter with Six Input Multiplexer

– High and Low References

– Conversion Rate = 10.7 μs

? 16-Bit Timer with Two Input Captures or One Input Capture Plus One Output Compare

– Resolution = 1.33 μs

– Input Capture Active Edge Software Selectable as Rising or Falling

? 15-Stage, Multi-Function Core Timer with Timer Overflow, Real-Time Interrupt, and Watchdog

? Asynchronous Serial Communications Interface (SCI)

? 22 General-Purpose I/O Lines, Some Shared with Peripheral Functions

? One 8-Bit High Source Current I/O Port

– 10 mA/Pin

– 20 mA Maximum/Port

– Port A

? One High-Sink Current 10 mA Output Pin, PB7

? Mask, Request, Acknowledge, Edge and Sensitivity (Edge- and Level-Sensitive or Edge-Sensitive Only) Control/Status Bits for IRQ Interrupt

? On-Chip Oscillator for Crystal/Ceramic Resonator

? Mask Selectable Computer Operating Properly (COP) Watchdog System

? Illegal Address Reset

? Steering Diode on RESET Pin to VDD