The Z80CPU/8400, manufactured by Zilog, is an 8-bit microprocessor, a variant of the popular Z80 family. This CPU is designed for embedded systems and general-purpose computing applications. It offered improvements over earlier microprocessors and found widespread use in various devices.

Applications

• Embedded systems
• Industrial control systems
• Consumer electronics
• Early personal computers
• Educational platforms

Features

• 8-bit data bus
• 16-bit address bus (64KB addressable memory)
• 158 instructions, including all 8080A instructions
• Integrated DRAM refresh circuitry
• Multiple interrupt modes
• Clock speed optimized for specific applications (8400 likely refers to clock speed or a specific production batch)

Benefits

• Versatile instruction set suitable for a wide range of applications
• Simplified system design with integrated DRAM refresh
• Backward compatibility with 8080A software
• Efficient interrupt handling capabilities
• Cost-effective solution for embedded control

Additional Details

The Z80CPU/8400 is known for its robust architecture and ease of programming. It offers various addressing modes and supports both 8-bit and 16-bit operations. The integrated DRAM refresh circuitry simplifies memory management. The Z80 also supports multiple interrupt modes, enabling efficient handling of external events. The CPU's instruction set includes load, store, arithmetic, logical, and control transfer operations. Its interrupt system includes a non-maskable interrupt (NMI) and a maskable interrupt (INT). The Z80/8400 builds upon the success of the original Z80, adding features and improvements that further enhance its performance and versatility. The 8400 designation likely refers to a specific clock speed rating or a production batch identifier.

Consult Zilog's datasheets for the Z80 family for pinout diagrams, electrical characteristics, and timing specifications.