HC705X

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HC705X Technical Summary

Overview

The HC705X is a member of Motorola's MC68HC05 family of low-cost, high-performance 8-bit microcontrollers. This fully static device features an on-chip oscillator, CPU core, memory subsystems, multiple I/O ports, and specialized peripherals including a Controller Area Network (CAN) module, analog-to-digital converters, and programmable timers. Designed for embedded control applications, the HC705X offers flexible operating modes and low-power consumption characteristics.

Key Features

• CPU Core: 8-bit HC05 architecture with 16-bit addressing
• Memory:
  • Up to 32KB ROM
  • 512B to 1KB RAM
  • 256B to 1KB EEPROM
• Specialized Peripherals:
  • Motorola CAN Module (MCAN) with bus interface circuitry
  • 8-channel 8-bit Analog-to-Digital Converter
  • Pulse Length Modulation (PLM) outputs
  • 16-bit Programmable Timer with input capture/output compare
  • Serial Communications Interface (SCI)
• Operating Modes:
  • Single-chip mode
  • Bootstrap mode (with serial RAM loader)
  • Low-power modes (STOP, WAIT, SLOW)
• Packages: 64-pin Quad Flat Pack (QFP)

Applications

The HC705X is suitable for a wide range of embedded control applications including:

• Automotive control systems (CAN network applications)
• Industrial automation and process control
• Consumer electronics
• Sensor interfaces and data acquisition systems
• Motor control systems
• Distributed control networks

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +7.0V
• Input Voltage: -0.3V to VDD+0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -55°C to +150°C

DC Characteristics (VDD = 5V ±10%, TA = -40°C to +85°C)

• Input High Voltage: 0.7VDD min
• Input Low Voltage: 0.2VDD max
• Output High Voltage: 0.8VDD min @ IOH = -0.5mA
• Output Low Voltage: 0.2VDD max @ IOL = 1.6mA
• Power Supply Current (Run mode @ 2MHz): 5mA typical
• Power Supply Current (WAIT mode): 1mA typical
• Power Supply Current (STOP mode): 10μA max

Analog-to-Digital Converter Characteristics

• Resolution: 8 bits
• Conversion Time: 32μs @ 2MHz system clock
• Integral Nonlinearity: ±1 LSB
• Differential Nonlinearity: ±0.5 LSB
• Analog Input Voltage Range: VRL to VRH

Package Information

64-pin Quad Flat Pack (QFP)

• Package Dimensions: 14mm x 14mm body
• Lead Pitch: 0.8mm
• Lead Count: 64
• Lead Material: Copper alloy
• Package Material: Plastic

Pinout Description

The 64-pin QFP package includes the following key pin functions:

• Power Supply: VDD, VSS (multiple pins)
• Clock: OSC1, OSC2
• Reset: RESET
• I/O Ports: PA0-PA7, PB0-PB7, PC0-PC7, PD0-PD7
• Analog Inputs: AN0-AN7
• CAN Interface: CANRX, CANTX
• Timer I/O: TCAP1, TCAP2, TCMP1, TCMP2
• Serial Interface: RDI, TDO, SCLK

Detailed Functional Description

CPU Core and Instruction Set

The HC705X features an enhanced HC05 CPU core with the following registers:

• 8-bit Accumulator (A)
• 8-bit Index Register (X)
• 16-bit Program Counter (PC)
• 16-bit Stack Pointer (SP)
• 8-bit Condition Code Register (CCR)

The instruction set includes:

• Register/memory operations
• Branch instructions
• Bit manipulation
• Read/modify/write operations
• Control instructions

Memory Organization

The memory map is organized as follows:

• $0000-$001F: I/O and control registers
• $0020-$00FF: RAM
• $0100-$1FFF: ROM (size varies by model)
• Special areas: Bootstrap ROM, EEPROM

CAN Module (MCAN)

The integrated CAN controller features:

• Full CAN 2.0B implementation
• Programmable bit rates up to 1Mbit/s
• Transmit and receive buffers
• Programmable acceptance filters
• Error detection and signaling
• Low-power sleep mode

Programmable Timer

The 16-bit timer system includes:

• Free-running counter with programmable prescaler
• Two input capture channels
• Two output compare channels
• Pulse length modulation outputs
• Timer overflow interrupt

Serial Communications Interface (SCI)

The SCI features:

• Full-duplex operation
• Standard NRZ format
• Programmable baud rate
• Receiver wake-up modes
• Error detection

Development Support

The HC705X is supported by:

• In-circuit emulators
• Cross assemblers and C compilers
• Evaluation boards
• ROM verification units
• Bootstrap loader utilities

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