• Device Type: CMOS SCC (Serial Communications Controller)
• Function: Dual-channel multiprotocol serial communication controller
• Technology: CMOS
• Package Options:
  • DIP-40
  • PLCC-44
  • QFP variants (depending on suffix)
• Maximum Clock Frequency: 16 MHz (-16 version)
• Serial Data Rate: Up to 4.0–4.1 Mbit/s per channel
• Channels: 2 independent full-duplex serial channels
• Interface: Optimized for non-multiplexed microprocessor buses
• Supply Voltage: +5 V CMOS operation
• Built-In Features:
  • Baud Rate Generator (BRG)
  • Digital Phase-Locked Loop (DPLL)
  • Crystal oscillator support
  • DMA support
  • Interrupt controller functions

Supported Protocols

• Asynchronous UART
• HDLC
• SDLC
• Bisync
• NRZ
• NRZI
• FM encoding formats

Asynchronous Mode Features

• 5, 6, 7, or 8 data bits
• 1, 1.5, or 2 stop bits
• Parity generation and checking
• Break detection and generation
• Framing and overrun error detection

Synchronous Mode Features

• Internal or external synchronization
• CRC-16 and CRC-CCITT generation/checking
• SDLC/HDLC frame handling
• Automatic zero insertion/deletion
• Abort detection and generation

DMA and FIFO Features

• 10 × 19-bit Status FIFO
• 14-bit Byte Counter
• Enhanced DMA support for high-speed communications

Additional Features

• Local loopback mode
• Auto echo mode
• Software interrupt acknowledge
• Supports T1 digital trunk applications
• Separate baud rate generators for each channel

Applications

• Z80-based computer systems
• Industrial controllers
• Communication terminals
• Routers and network equipment
• HDLC/SDLC communication systems
• RS-232, RS-422, and RS-485 interfaces
• Telecommunications equipment