The MSM82C55A-2G3-2K is a programmable peripheral interface (PPI) chip manufactured by OKI/Metcal. It is a versatile I/O expansion device that allows microprocessors to interface with external peripheral devices. It is functionally compatible with the Intel 8255A PPI.

Applications

• I/O Expansion: Expands the I/O capabilities of microprocessors and microcontrollers.
• Peripheral Interfacing: Interfaces microprocessors with various peripheral devices such as sensors, actuators, and displays.
• Data Acquisition Systems: Used in data acquisition systems for acquiring data from sensors.
• Control Systems: Utilized in control systems for controlling external devices.
• Industrial Automation: Integrated into industrial automation systems for controlling machinery and equipment.

Features

• Three 8-bit I/O Ports: Provides three 8-bit programmable I/O ports (Port A, Port B, and Port C).
• Programmable Modes: Supports various programmable modes for flexible I/O configuration.
• Bit Set/Reset Capability: Allows individual bits of Port C to be set or reset.
• TTL Compatible: Compatible with TTL logic levels.
• Low Power Consumption: Consumes minimal power for energy-efficient operation.

Benefits

• Flexible I/O Configuration: Allows for flexible configuration of I/O ports to meet specific application requirements.
• Simplified Interfacing: Simplifies the interfacing of microprocessors with peripheral devices.
• Reduced Component Count: Reduces external component count by providing integrated I/O capabilities.
• Enhanced System Performance: Improves system performance by providing efficient I/O handling.
• Cost-Effective Solution: Offers a cost-effective solution for I/O expansion.

Additional Details

The MSM82C55A-2G3-2K is programmed through its control register, which determines the operating mode of each I/O port. It supports various operating modes, including basic input/output, strobed input/output, and bidirectional bus operation. The device is typically connected to the microprocessor's address, data, and control buses. Detailed specifications, including timing characteristics, pinout information, and programming details, are available in the OKI/Metcal datasheet.