80C552

80C552/83C552 Single-Chip 8-Bit Microcontroller Technical Summary

Overview

The 80C552/83C552 (referred to generically as 8XC552) is a high-performance single-chip 8-bit microcontroller manufactured using advanced CMOS technology. This device combines the powerful 80C51 CPU core with enhanced peripheral features, making it suitable for a wide range of embedded control applications. With its integrated 8KB ROM (expandable externally to 64KB), on-chip RAM, and comprehensive set of peripherals, the 8XC552 provides a complete microcontroller solution that minimizes external component requirements.

Key advantages of the 80C552 include its low-power operation, robust instruction set, and flexible I/O capabilities. The microcontroller operates across a wide voltage range and features multiple power-saving modes, making it ideal for both industrial and consumer applications where power efficiency is critical.

Features

• 80C51 Central Processing Unit - Fully compatible with the industry-standard 8051 instruction set
• Memory Configuration - 8KB × 8 ROM (expandable externally to 64KB) with 256 × 8 RAM
• Clock Speed - Operates up to 16MHz clock frequency
• Power Management - Multiple power-saving modes including idle and power-down
• I/O Ports - Six 8-bit I/O ports with programmable configurations
• Timers/Counters - Three 16-bit timers/counters (including one watchdog timer)
• Analog Features - 8-channel 10-bit ADC and PWM outputs
• Serial Communication - Full-duplex UART and I²C bus interface
• Interrupt System - 15 interrupt sources with 4 priority levels
• Operating Voltage - 4.5V to 5.5V operation

Applications

The 80C552 microcontroller is designed for a broad range of embedded control applications, including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Instrumentation and measurement equipment
• Motor control systems
• Power management systems
• Building automation
• Medical devices

The integrated analog-to-digital converter and PWM outputs make it particularly suitable for applications requiring analog signal processing or motor control. The robust I²C interface enables easy communication with peripheral devices and sensors.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.5V to +7.0V
• Input Voltage on Any Pin: -0.5V to VCC+0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

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

• Power Supply Current (Active Mode @ 16MHz): 25mA max
• Power Supply Current (Idle Mode @ 16MHz): 6.5mA max
• Power Supply Current (Power-down Mode): 100μA max
• Input Low Voltage (VIL): -0.5V to 0.2VCC-0.1V
• Input High Voltage (VIH): 0.2VCC+0.9V to VCC+0.5V
• Output Low Voltage (IOL = 1.6mA): 0.45V max
• Output High Voltage (IOH = -60μA): 2.4V min

AC Characteristics

• Oscillator Frequency: 3.5MHz to 16MHz
• Machine Cycle: 12 oscillator periods (1μs @ 12MHz)
• ALE Pulse Width: 85ns min
• Port Rise/Fall Time: 20ns max
• ADC Conversion Time: 20μs typical

Package Information

Available Packages

• PLCC (Plastic Leaded Chip Carrier) - 68-pin package with 1.27mm lead pitch
• QFP (Quad Flat Package) - 80-pin package with 0.65mm lead pitch

Package Dimensions (PLCC-68)

• Body Size: 24.23mm × 24.23mm
• Height: 4.06mm max
• Lead Count: 68
• Lead Pitch: 1.27mm
• Lead Width: 0.38mm nominal

Thermal Characteristics

• Thermal Resistance (Junction-to-Ambient): 50°C/W (PLCC)
• Maximum Junction Temperature: +150°C
• Power Dissipation: 1.5W max

Functional Description

CPU Core

The 80C552 features an enhanced 80C51 CPU core that executes all standard 8051 instructions. The CPU includes 256 bytes of internal RAM, 128 bytes of which are available for general-purpose use, while the remaining 128 bytes are used for special function registers (SFRs). The architecture supports 64KB of external program memory and 64KB of external data memory space.

Memory Organization

The memory space is organized as follows:

• 8KB of mask-programmable ROM (80C552)
• 256 bytes of internal RAM (128 bytes general purpose + 128 bytes SFR)
• External memory expandable to 64KB for both program and data memory
• Memory mapping control via software-configurable memory interface

Special Function Registers

The 80C552 extends the standard 8051 SFR set with additional registers to control its enhanced peripherals. These include registers for:

• ADC control and data
• PWM configuration
• Additional timer controls
• Extended interrupt handling
• I²C bus interface

Development Support

The 80C552 is supported by a comprehensive ecosystem of development tools, including:

• In-circuit emulators and debuggers
• C compilers and assemblers
• Evaluation boards and starter kits
• Flash-based versions for prototyping (83C552)
• Programming tools for production devices

For applications requiring ROM code development, the 83C552 version with EPROM or the availability of OTP (One-Time Programmable) versions facilitates prototyping and low-volume production.