A6821SA-T

The A6821SA-T is a versatile peripheral interface adapter (PIA) IC designed for use in microcontroller-based systems. It provides parallel input/output capabilities and various control functions, making it ideal for interfacing with external devices and peripherals.

Pinout

(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

• PA0-PA7: Bidirectional parallel data bus
• PB0-PB7: Bidirectional parallel data bus
• CA1, CA2: Control lines for port A
• CB1, CB2: Control lines for port B
• RS0-RS3: Register select lines
• IRQ, NMI: Interrupt lines
• R/W: Read/Write control line
• CS1, CS2: Chip select lines
• RDY: Ready line
• RES: Reset input
• VCC: Positive power supply
• VSS: Ground

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the A6821SA-T IC for a visual representation.

Key Features

• Parallel I/O Ports: The A6821SA-T features two 8-bit parallel I/O ports for versatile interfacing with external devices.
• Control Lines: Provides control lines for each port, allowing for flexible data transmission and reception.
• Interrupt Capability: Supports interrupt lines for asynchronous event notification to the microcontroller.
• Register Select: Includes register select lines for accessing different internal registers within the IC.
• Reset Function: Incorporates a reset input for initializing the IC to a known state.

Note: For detailed technical specifications, please refer to the A6821SA-T datasheet.

Application

• Peripheral Interface: Ideal for interfacing microcontrollers with external peripherals such as memory, displays, and sensors.
• Control Systems: Suitable for use in control systems requiring parallel data transfer and control signal generation.
• Data Acquisition: Used in data acquisition systems for capturing and processing data from multiple sources simultaneously.

Functionality

The A6821SA-T serves as a bridge between the microcontroller and external devices, providing efficient data exchange and control signal handling for various applications.

Usage Guide

• Power Supply: Connect VCC (Pin 1) to the positive power supply and VSS (Pin 24) to ground.
• Data Connections: Utilize the PA0-PA7 and PB0-PB7 pins for parallel data transfer between the IC and external devices.
• Control Signals: Use the control lines (CA1, CA2, CB1, CB2) to manage the data flow and communication protocol.

Frequently Asked Questions

Q: Can the A6821SA-T handle bidirectional data transfer?
A: Yes, the A6821SA-T supports bidirectional data transfer through its parallel I/O ports, enabling both input and output operations.

Q: What is the reset mechanism for the A6821SA-T?
A: The A6821SA-T features a reset input (RES) that can be used to initialize the IC and bring it to a predefined state for operation.