CMS82C55AZ

Overview

Category: Integrated Circuit (IC)

Use: The CMS82C55AZ is a versatile programmable peripheral interface chip that can be used in various electronic systems for interfacing with external devices.

Characteristics: - Programmable: The CMS82C55AZ can be programmed to perform different functions based on the requirements of the system. - Versatile: It offers three modes of operation - Mode 0, Mode 1, and Mode 2, providing flexibility in handling different types of data transfers. - High-speed Data Transfer: It supports high-speed data transfer rates, making it suitable for applications requiring quick data processing. - Low Power Consumption: The chip is designed to operate efficiently with low power consumption, making it suitable for battery-powered devices. - Compact Package: The CMS82C55AZ is available in a compact package, allowing for easy integration into electronic systems.

Package: The CMS82C55AZ is typically available in a 40-pin DIP (Dual Inline Package) or PLCC (Plastic Leaded Chip Carrier) package.

Essence: The CMS82C55AZ acts as an interface between a microprocessor and external devices, enabling data transfer and control signals between them.

Packaging/Quantity: The CMS82C55AZ is commonly sold individually or in reels containing multiple units, depending on the supplier.

Specifications

• Supply Voltage: 5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 8 MHz
• Number of I/O Ports: 24
• Number of Interrupt Inputs: 3
• Number of Timers/Counters: 2

Pin Configuration

The CMS82C55AZ has a total of 40 pins. Here is the detailed pin configuration:

Functional Features

The CMS82C55AZ offers the following functional features:

1. Three Operating Modes:

   • Mode 0: Basic Input/Output (I/O) mode
   • Mode 1: Strobed Input/Output mode
   • Mode 2: Bidirectional Bus I/O mode

2. Programmable Ports:

   • Port A: Can be configured as either input or output port.
   • Port B: Can be divided into two 8-bit ports (Port B and Port C Upper) or used as a single 16-bit port.
   • Port C: Can be divided into two 8-bit ports (Port C Lower and Port C Upper) or used as a single 16-bit port.

3. Interrupt Capability:

   • The CMS82C55AZ supports three interrupt inputs, allowing external devices to request attention from the microprocessor.

4. Timer/Counter Functionality:

   • It includes two 16-bit programmable timers/counters that can be used for various timing and counting applications.

Advantages and Disadvantages

Advantages: - Versatility: The CMS82C55AZ can be programmed to suit different system requirements. - High-Speed Data Transfer: It supports fast data transfer rates, enabling efficient communication with external devices. - Low Power Consumption: The chip operates with low power consumption, making it suitable for battery-powered devices. - Compact Package: Its compact package allows for easy integration into electronic systems.

Disadvantages: - Limited Number of I/O Ports: The CMS82C55AZ has a limited number of I/O ports, which may restrict its use in complex systems requiring more I/O interfaces. - Compatibility: It may not be compatible with all microprocessors, requiring careful consideration during system design.

Working Principles

The CMS82C55AZ works by receiving commands and data from the microprocessor and performing the specified operations based on the selected mode of operation. It communicates with external devices through its I/O ports, allowing data transfer and control signals to be exchanged.

Application Field Plans

The CMS82C55AZ finds applications in various electronic systems, including but not limited to: - Industrial Control Systems - Robotics - Communication Equipment - Test and Measurement Instruments - Home Automation Systems

Alternative Models

Here are some alternative models that offer similar functionality to the CMS82C55AZ: - Intel 8255A - Motorola MC6821 - Zilog Z80PIO

These alternative models can be considered based on specific system requirements and compatibility with the microprocessor being used.

In conclusion, the CMS82C55AZ is a versatile programmable peripheral interface chip that offers flexibility, high-speed data transfer, and low power consumption. Its compact package and various operating modes make it suitable for a wide range of applications in different industries.