8XC51

8XC51/80C31 - 8-bit CMOS Microcontroller Technical Summary

Overview

The Philips 8XC51/31 is a high-performance static 80C51 microcontroller fabricated using Philips' advanced high-density CMOS technology. This component combines low-power operation with high-speed processing capabilities, making it suitable for a wide range of embedded applications. The device maintains full compatibility with the standard 8051 instruction set while offering enhanced features and improved power efficiency.

Key advantages of this microcontroller include its wide operating voltage range (2.7V to 5.5V), multiple power control modes for energy-sensitive applications, and robust peripheral set. The architecture supports both CMOS and TTL logic levels, providing flexibility in system design. With its static operation capability, the device can maintain its state even when the clock is stopped, enabling ultra-low-power operation scenarios.

Features

• 8051 Central Processing Unit
  • 4k × 8 ROM (80C51 variant)
  • 128 × 8 RAM
  • Three 16-bit counter/timers
  • Full duplex serial channel
  • Boolean processor capabilities
• Memory Architecture
  • 64k ROM and 64k RAM addressing capability
  • Dual Data Pointers for efficient memory operations
  • Second DPTR register for enhanced data handling
• Power Management
  • Clock can be stopped and resumed (static operation)
  • Idle mode for reduced power consumption
  • Power-down mode with ultra-low current draw
  • Wake-up from Power Down by external interrupt
• Performance Options
  • Three speed ranges at VCC = 5V: 0-16MHz, 0-33MHz
  • Low voltage operation (2.7V to 5.5V @ 16MHz)
• Security Features
  • ROM protection (2 security bits)
  • OTP/EPROM protection (3 security bits)
  • 64-byte encryption array
• Enhanced Communication
  • Full-duplex enhanced UART with framing error detection
  • Automatic address recognition
  • Asynchronous port reset capability
• I/O Capabilities
  • Four 8-bit I/O ports
  • Programmable clock output
  • Low EMI mode (inhibit ALE)
• Interrupt System
  • 4-level priority interrupt system
  • 6 interrupt sources

Applications

The 8XC51/80C31 microcontroller is designed for a broad spectrum of embedded applications, particularly where power efficiency and processing performance are both important considerations. Typical application areas include:

• Industrial Control Systems: Process monitoring, sensor interfaces, and control loops
• Consumer Electronics: Remote controls, smart home devices, and appliances
• Automotive Systems: Body electronics, sensor interfaces, and simple control units
• Communication Devices: Modems, serial communication interfaces, and protocol converters
• Medical Equipment: Portable monitoring devices and diagnostic equipment
• Security Systems: Access control devices and alarm systems
• Power Management: Battery-powered devices and energy monitoring systems

Electrical Characteristics

The 8XC51/80C31 offers excellent electrical characteristics that make it suitable for both battery-powered and line-powered applications:

• Operating Voltage Range: 2.7V to 5.5V
• Speed Grades:
  • 0 to 16MHz operation across full voltage range
  • 0 to 33MHz operation at 5V
• Power Consumption:
  • Active mode: Typically 5mA at 5V, 12MHz
  • Idle mode: Typically 1.5mA at 5V, 12MHz
  • Power-down mode: Typically 50μA at 5V
• I/O Characteristics:
  • TTL and CMOS compatible inputs
  • Programmable output drive strength
  • Schmitt trigger inputs on selected pins
• Temperature Range:
  • Commercial: 0°C to +70°C
  • Industrial: -40°C to +85°C
  • Extended: -55°C to +125°C (selected versions)

Package Information

The 8XC51/80C31 is available in multiple package options to suit different application requirements:

• Plastic Dual In-line Package (PDIP):
  • 40-pin configuration
  • Standard through-hole mounting
  • 0.6" width
• Plastic Leaded Chip Carrier (PLCC):
  • 44-pin configuration
  • J-lead design for surface mounting
  • 1.4" square footprint
• Quad Flat Package (QFP):
  • 44-pin configuration
  • Surface mount package with gull-wing leads
  • Compact footprint for space-constrained applications

Each package option maintains the full functionality of the device while offering different mechanical and thermal characteristics. The choice of package depends on the specific application requirements for board space, thermal management, and assembly process.

Development Support

The 8XC51/80C31 is supported by a comprehensive development ecosystem including:

• Full-featured C compilers and assemblers
• In-circuit emulators and debuggers
• Evaluation boards and development kits
• Programming tools for ROM and OTP versions
• Application notes and reference designs

This extensive support infrastructure enables rapid development and deployment of systems based on the 8XC51/80C31 microcontroller, reducing time-to-market for new products.