INTRODUCTION

The Motorola MC68HC705MC4 microcontroller is a low-cost M68HC05 Family EPROM microprocessor intended for use in industrial motor control and power supply applications. It features a 2-channel, 8-bit high speed PWM module (including a commutation mux for brushless permanent magnet motor control), a 6 input, 8-bit A/D to accommodate analog feedback signals, and an SCI to support multi-controller networking. This device is available in the 28-pin PDIP and 28-pin SOIC package.

FEATURES (all timing based on 3 MHz bus)

• Low cost, HC05 Core running at 3 MHz bus speed (at VDD = 5 V +/- 10)

• 28-pin PDIP, SOIC or windowed ceramic package. Low EMI emission pinout

• 3584 Bytes of User EPROM (including eight User Vectors of 2 Bytes each)

• 176 Bytes of User RAM

• Dual channel, high speed PWM featuring:

- 8-bit resolution

- Independent prescaler frequency selection and period counters

- 2 frequency ranges, 9 steps in each: A: 183 Hz to 23.4 kHz, B: 122 Hz to 15.6 kHz

- S/W programmable PWM polarity

- Dual S/W controllable PWM output mux (each PWM to 3 I/O)

• 8-bit +/- 1LSB A/D converter with 6 input mux. High and low references. Conversion rate = 10.7 µS

• 16-bit timer with 2 input captures or 1 input capture plus 1 output compare. Resolution = 1.33 µS. Input Capture active edge S/W selectable as rising, falling, or both

• 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 @ VDD-2.0 V, 20 mA max/port) (Port A)

• One high sink current (10mA @ 1.0 V) 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 COP Watchdog System

• Power Saving STOP and WAIT Mode Instructions (Mask Selectable STOP Instruction Disable)

• Illegal Address Reset

• Steering Diode on RESET Pin to VDD