The MC2681P is a dual universal asynchronous receiver/transmitter (DUART) manufactured by Freescale (now NXP). It's a versatile communication interface designed to provide two independent serial channels for data transmission and reception. This device simplifies serial communication in a variety of embedded systems and control applications.

Applications

• Serial communication interfaces in embedded systems
• Industrial control systems
• Data acquisition systems
• Point-of-sale terminals
• Modems and other communication devices

Features

• Two independent UART channels
• Programmable baud rate generator for each channel
• 5-, 6-, 7-, or 8-bit character operation
• Even, odd, or no parity generation and detection
• 1, 1.5, or 2 stop bit operation
• Full duplex operation
• False start bit detection
• Line break generation and detection
• Local and remote loopback modes
• Multiprocessor communication mode
• Interrupt control logic
• Modem control signals (CTS, RTS, DSR, DTR, RI, DCD)
• On-chip crystal oscillator

Benefits

• Dual channels: Reduces the number of components needed for dual serial communication, saving board space and cost.
• Programmable baud rates: Offers flexibility in adapting to different communication standards and devices.
• Error detection: Parity checking and false start bit detection enhance data integrity.
• Modem control signals: Enables direct connection to modems and other communication equipment.
• Versatile operation: Supports a wide range of data formats and communication protocols.
• Interrupt support: Allows efficient handling of serial communication events.

The MC2681P's on-chip baud rate generators provide a wide range of baud rates. The device also includes extensive error detection capabilities to ensure data integrity. Its flexible interrupt control logic simplifies integration with microcontrollers and other system components. The modem control signals enable direct connection to standard modem equipment, making it suitable for data communication applications. The device typically operates from a single 5V supply.