The R65C51J2 is a single-channel asynchronous communication interface adapter (ACIA) manufactured by Rockwell. It's designed to provide a serial communication interface for microprocessors and microcontrollers. It is a CMOS version of the popular 6551 ACIA.

Applications

• Serial Communication
• Modem Interface
• Printer Interface
• Data Acquisition Systems
• Embedded Systems

Features

• Single-Channel Asynchronous Communication
• Programmable Baud Rate Generator
• Full-Duplex Operation
• Data Framing Options (Start Bit, Stop Bits, Parity)
• Interrupt Generation
• CMOS Technology for Low Power Consumption

Benefits

• Provides a simple and reliable serial communication interface.
• Programmable baud rate generator allows for flexible communication speeds.
• Full-duplex operation enables simultaneous transmission and reception.
• Data framing options ensure data integrity.
• Interrupt generation allows for efficient handling of serial data.
• Low power consumption makes it suitable for battery-powered applications.

Additional Details

The R65C51J2 is typically interfaced to a microprocessor or microcontroller via an 8-bit data bus and control signals (RS, R/W, CS, IRQ). The baud rate is programmable using an on-chip baud rate generator. The device supports various data framing options, including different numbers of stop bits and parity options. Interrupts can be generated to signal the arrival of data or the completion of a transmission. The R65C51J2 is commonly used in embedded systems and other applications requiring serial communication. Consult the datasheet for detailed electrical specifications, timing diagrams, and programming information. The device requires proper termination and buffering of the serial communication lines for optimal performance. Care should be taken to select appropriate baud rates and data framing options to ensure compatibility with the communicating device.