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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 ms

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

One Output Compare

– Resolution = 1.33 ms

– 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