HC708MP

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HC708MP Microcontroller Technical Summary

Overview

The HC708MP is a high-performance 8-bit microcontroller from Motorola's HC08 family. It features an enhanced M68HC08 architecture with integrated peripherals, making it suitable for embedded control applications. The device combines EPROM/OTPROM program memory, RAM, and a rich set of I/O capabilities in a single package.

Key aspects of the HC708MP include:

• 8-bit M68HC08 CPU core with enhanced instruction set
• Integrated memory subsystems including RAM and EPROM/OTPROM
• Comprehensive peripheral set including timers, serial interfaces, and analog capabilities
• Flexible clock generation options including crystal oscillator and PLL
• Low-power operating modes for energy-efficient applications

Features

The HC708MP microcontroller offers an extensive feature set:

Core Features

• 8-bit M68HC08 CPU core operating at up to 8 MHz
• Enhanced instruction set with 16-bit index register
• 64 KB address space
• Low-power wait and stop modes

Memory Features

• Up to 16 KB EPROM/OTPROM program memory
• 512 bytes of RAM
• Monitor ROM for bootstrap and debugging
• Memory protection features

Peripheral Features

• System Integration Module (SIM) for clock and reset control
• Clock Generator Module (CGM) with PLL
• Pulse Width Modulator for motor control (PWMMC)
• Two Timer Interface Modules (TIMA and TIMB)
• Serial Peripheral Interface (SPI)
• Serial Communications Interface (SCI)
• 10-bit Analog-to-Digital Converter (ADC)
• Multiple I/O ports with flexible configuration

System Features

• Power-On Reset (POR)
• Low-Voltage Inhibit (LVI)
• Computer Operating Properly (COP) watchdog
• External interrupt capability

Applications

The HC708MP is designed for a wide range of embedded control applications, including:

• Motor control systems
• Industrial automation
• Automotive electronics
• Consumer appliances
• Security systems
• Medical devices
• Power management systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +6.0V
• Input Voltage: -0.3V to VDD+0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -55°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VDD): 3.0V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input High Voltage: 0.7 x VDD to VDD
• Input Low Voltage: 0 to 0.3 x VDD

Power Consumption

• Active Mode (8 MHz): 15 mA typical
• Wait Mode: 5 mA typical
• Stop Mode: 50 μA typical

Timing Characteristics

• CPU Clock Frequency: DC to 8 MHz
• Bus Clock Frequency: DC to 4 MHz
• PLL Lock Time: 10 ms typical
• Reset Pulse Width: 1.5 μs minimum

Package Information

Available Packages

• 52-pin Plastic Quad Flat Pack (PQFP)
• 64-pin Quad Flat Pack (QFP)

Pin Configuration

The HC708MP features multiple I/O ports and dedicated function pins:

Power Supply Pins

• VDD, VSS: Main power supply
• VDDA, VSSA: Analog power supply
• VDDAD, VSSAD: ADC power supply

Clock Pins

• OSC1, OSC2: Crystal oscillator connections
• CGMXFC: External filter capacitor for PLL

Control Pins

• RST: External reset input
• IRQ1/VPP: External interrupt/programming voltage

I/O Ports

• Port A: 8-bit general purpose I/O
• Port B: 8-bit I/O with ADC channel inputs
• Port C: 7-bit I/O with ADC channel inputs
• Port D: Input-only port with special functions
• Port E: I/O port with timer functions
• Port F: I/O port with serial interface functions

Special Function Pins

• PWM1-PWM6: Pulse Width Modulator outputs
• PWMGND: PWM ground reference
• VADCAP: ADC voltage decoupling capacitor
• VREFL: ADC voltage reference low

Memory Organization

The HC708MP features a linear memory map with the following key regions:

Memory Map Overview

• 0000-003F: I/O and control registers
• 0040-00FF: RAM
• 0100-1FFF: User EPROM/OTPROM
• FF00-FFFF: Monitor ROM and vectors

I/O Register Map

The I/O section contains control registers for all peripherals:

• System Integration Module (SIM) registers
• Clock Generator Module (CGM) registers
• Timer registers
• Serial interface control registers
• ADC control registers
• Port data and control registers

Development Support

The HC708MP is supported by a comprehensive development ecosystem:

• In-circuit emulation capability
• Monitor ROM for bootstrap loading
• EPROM/OTPROM programming support
• Development tools from Motorola and third parties

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