HC05BD2

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HC05BD2 Technical Summary

Overview

The HC05BD2 is an 8-bit microcontroller unit (MCU) from the M68HC05 family, designed using HCMOS technology for cost-sensitive applications. It features an on-chip oscillator, CPU, RAM, ROM, parallel I/O, PWM channels, and specialized interfaces for monitor control applications. With its robust peripheral set and flexible I/O capabilities, it is particularly suited for multi-sync computer monitor controllers.

Key Features

Hardware Features

• HC05 CPU Core
• HCMOS technology for low power consumption
• Available in 40-pin DIP and 42-pin SDIP packages
• 256 bytes of on-chip RAM
• 5.75K bytes of user ROM
• 26 bidirectional I/O lines (14 dedicated + 12 multiplexed)
• 16 x 8-bit PWM channels with open-drain outputs
• On-chip oscillator with crystal/ceramic resonator support
• DDC12AB interface module
• 6-bit analog-to-digital converter (ADC)
• Sync processor for display timing control
• Multi-function timer

Software Features

• Standard M68HC05 instruction set
• Multiple addressing modes
• Bit manipulation instructions
• Interrupt handling capabilities
• Low-power STOP and WAIT modes

Signal Description

Power Pins

• VDD: Positive power supply (5V ±10%)
• VSS: Ground reference

Clock Pins

• EXTAL: External clock input or crystal connection
• XTAL: Crystal connection

Control Pins

• RESET: Active-low reset input
• IRQ/VPP: External interrupt input or programming voltage

I/O Ports

• PA0-PA7: 8-bit bidirectional I/O port
• PB0-PB5: 6-bit bidirectional I/O port
• PC0-PC7: Multiplexed I/O port with PWM and ADC functions
• PD0-PD3: Multiplexed I/O port with special functions

Special Function Pins

• PWM0-PWM7: Dedicated PWM outputs
• HSYNC/VSYNC: Horizontal and vertical sync inputs
• SDA*/SCL*: I2C-compatible serial data/clock
• CLAMP/SOG: Video clamp and sync-on-green functions

Applications

• Multi-sync computer monitor controllers
• Display control systems
• Consumer electronics
• Industrial control systems
• Embedded control applications

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.3V to +7.0V
• Input Voltage: -0.3V to VDD + 0.3V
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -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: VDD - 0.8V min
• Output Low Voltage: 0.4V max
• Power Supply Current: 10mA typical (5MHz operation)

Timing Characteristics

• Oscillator Frequency: 1MHz to 5MHz
• Instruction Cycle Time: 1μs at 5MHz
• Reset Pulse Width: 1.5μs min
• Interrupt Pulse Width: 100ns min

Package Information

40-Pin DIP Package (Case 711-03)

• Package Dimensions: 52.32mm x 13.97mm
• Lead Pitch: 2.54mm
• Lead Count: 40
• Material: Plastic

42-Pin SDIP Package (Case 858-01)

• Package Dimensions: 52.58mm x 15.24mm
• Lead Pitch: 1.778mm
• Lead Count: 42
• Material: Plastic

Memory Organization

• ROM: 5.75K bytes (addresses $C00-$1FFF)
• RAM: 256 bytes (addresses $0040-$013F)
• I/O Registers: 64 bytes (addresses $0000-$003F)
• Interrupt Vectors: 12 bytes (addresses $1FF4-$1FFF)

CPU Core

The HC05 core features:

• 8-bit accumulator (A)
• 8-bit index register (X)
• 16-bit stack pointer (SP)
• 16-bit program counter (PC)
• 8-bit condition code register (CCR) with:
  • Half Carry (H) flag
  • Interrupt Mask (I) flag
  • Negative (N) flag
  • Zero (Z) flag
  • Carry/Borrow (C) flag

Interrupt System

The HC05BD2 features a comprehensive interrupt system with:

• External interrupt (IRQ)
• VSYNC interrupt
• DDC12AB interrupt
• Multi-function timer interrupt
• Software interrupt (SWI)
• Reset interrupt

Operating Modes

• User Mode: Normal program execution
• Self-Check Mode: For factory testing
• Bootstrap Mode: For system initialization
• Low Power Modes:
  • STOP mode (lowest power consumption)
  • WAIT mode (reduced power with timer active)

Development Support

The HC05BD2 is supported by:

• In-circuit emulators
• Cross-assemblers
• C compilers
• Debugging tools
• Evaluation boards

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