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