The UPD82C55AC-2A is a programmable peripheral interface (PPI) chip manufactured by NEC. It is a versatile I/O device that allows microprocessors to interface with a wide range of peripheral devices. It provides 24 I/O lines that can be individually configured as inputs or outputs, making it suitable for various control and data acquisition applications.

Applications

• Industrial Control Systems: Interfacing with sensors, actuators, and other control devices.
• Data Acquisition Systems: Collecting data from various sources.
• Computer Peripherals: Interfacing with printers, keyboards, and other peripherals.
• Robotics: Controlling robot movements and sensing feedback.
• Embedded Systems: Providing I/O capabilities in embedded applications.

Features

• 24 Programmable I/O Lines: Provides flexible I/O configuration.
• Three 8-Bit Ports (Port A, Port B, Port C): Allows for parallel data transfer.
• Bit Set/Reset Capability (Port C): Enables individual bit manipulation.
• Multiple Operating Modes: Offers different modes of operation for various applications.
• Compatible with Various Microprocessors: Can be interfaced with a wide range of microprocessors.

Benefits

• Flexible I/O Configuration: Allows for customization of I/O lines to meet specific application requirements.
• Simplified System Design: Reduces the need for external logic circuits.
• Cost-Effective Solution: Provides a cost-effective solution for I/O interfacing.
• Improved System Performance: Enhances system performance by providing efficient I/O capabilities.
• Wide Range of Applications: Suitable for various control and data acquisition applications.

Additional Details

The UPD82C55AC-2A operates on a single 5V power supply. It is typically available in a 40-pin DIP (Dual In-line Package). The operating modes include Mode 0 (Basic Input/Output), Mode 1 (Strobed Input/Output), and Mode 2 (Bidirectional Bus). The data transfer rate is typically in the MHz range, depending on the microprocessor clock speed. Detailed timing diagrams and programming instructions are available in the device's datasheet. Proper address decoding is essential for correct integration. Refer to the datasheet for complete specifications and application circuit examples.