8XC58 Single-Chip 8-Bit Microcontroller

Overview

The 8XC58 is a high-performance member of the MCS® 51 microcontroller family, designed for embedded control applications. This powerful 8-bit microcontroller combines enhanced features with the industry-standard 8051 architecture, making it ideal for applications requiring advanced I/O capabilities, pulse-width modulation (PWM), and high-speed counting operations.

With its enhanced instruction set and additional hardware features, the 8XC58 provides significant performance improvements over standard 8051 implementations while maintaining full compatibility with the existing 8051 software base. The device is particularly well-suited for motor control applications, industrial automation, and other embedded systems requiring precise timing and control capabilities.

Key Features

• Enhanced 8051 Architecture: Fully compatible with standard 8051 instruction set with additional instructions for improved performance
• High-Speed Operation: 16 MHz maximum operating frequency with 1 μs instruction cycle time
• Advanced PWM Capabilities: Multiple pulse-width modulation channels for motor control applications
• Versatile I/O Capabilities: 32 programmable I/O lines with high-current drive capability
• Enhanced Serial Communication: Multiprocessor communication support with automatic address recognition
• Up/Down Counting: Hardware support for up/down counting operations
• On-Chip Memory: 8KB of UV-erasable EPROM and 256 bytes of RAM
• Power Management: Multiple power-saving modes including idle and power-down

Applications

The 8XC58 is designed for a wide range of embedded control applications, particularly those requiring precise timing and motor control capabilities:

• Motor Control Systems: Brushless DC motor control, stepper motor control, and servo motor applications
• Industrial Automation: Programmable logic controllers, process control systems, and industrial sensors
• Automotive Systems: Engine control units, transmission control, and automotive lighting systems
• Power Conversion: Switch-mode power supplies, inverters, and power factor correction circuits
• Consumer Electronics: Appliances, power tools, and HVAC control systems
• Medical Devices: Portable medical equipment and diagnostic instruments

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (Vcc): -0.5V to +7.0V
• Input Voltage (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)

• Supply Current (Active Mode @ 16MHz): 25 mA maximum
• Supply Current (Idle Mode @ 16MHz): 6.5 mA maximum
• Supply Current (Power Down Mode): 100 μA maximum
• Input Low Voltage (VIL): -0.5V to 0.8V
• Input High Voltage (VIH): 2.0V to Vcc +0.5V
• Output Low Voltage (IOL = 1.6mA): 0.45V maximum
• Output High Voltage (IOH = -60μA): 2.4V minimum

AC Characteristics

• Oscillator Frequency Range: 3.5 MHz to 16 MHz
• Machine Cycle Time: 750 ns @ 16 MHz
• External Data Memory Write Pulse Width: 300 ns minimum
• Serial Port Baud Rate: Up to 625 Kbps @ 16 MHz
• PWM Resolution: 8-bit or 16-bit programmable

Package Information

Available Packages

• PLCC (Plastic Leaded Chip Carrier): 44-lead package (11.43 mm x 11.43 mm body)
• PQFP (Plastic Quad Flat Pack): 44-lead package (10 mm x 10 mm body, 0.8 mm lead pitch)
• DIP (Dual In-line Package): 40-lead package (52.32 mm x 13.97 mm body)

Pin Configuration

The 8XC58 features a versatile pin configuration that includes:

• Four 8-bit I/O ports (Port 0, 1, 2, and 3)
• Power supply pins (Vcc and GND)
• Reset input
• External access enable (EA)
• Address latch enable (ALE)
• Program store enable (PSEN)
• Crystal oscillator inputs (XTAL1 and XTAL2)
• PWM output channels
• Serial communication pins (TXD and RXD)
• External interrupt inputs

Functional Description

CPU Core

The 8XC58 features an enhanced 8051 CPU core that executes all standard 8051 instructions in as few as 1 or 2 clock cycles, compared to the 12 clock cycles required by standard 8051 implementations. This results in significantly improved performance while maintaining full object code compatibility with existing 8051 software.

Memory Organization

The microcontroller features a Harvard architecture with separate address spaces for program and data memory:

• 8KB EPROM: On-chip UV-erasable program memory
• 256 bytes RAM: On-chip data memory (128 bytes standard 8051 RAM + 128 bytes extended RAM)
• 64KB External: Capability to address up to 64KB each of external program and data memory

Special Function Registers (SFRs)

The 8XC58 extends the standard 8051 SFR space to support its additional features, including:

• PWM control registers
• Enhanced timer/counter registers
• Additional interrupt control registers
• Power management control registers

Development Support

The 8XC58 is supported by a comprehensive development ecosystem including:

• In-circuit emulators and debuggers
• C and assembly language compilers
• Evaluation boards and development kits
• Programming tools for the on-chip EPROM
• Application notes and reference designs for common applications