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說明

The TL28L92 is a pin and function replacement for the SC26C92 operating at 3.3 V or 5 V supply with added features and deeper FIFOs. Its configuration on power-up is that of the SC26C92. Its differences from the SC26C92 are: 16 character receiver, 16 character transmit FIFOs, watchdog timer for each receiver, mode register 0 is added, extended baud rate and overall faster speeds, programmable receiver and transmitter interrupts.

Pin programming will allow the device to operate with either the Motorola or Intel bus interface. The bit 3 of the MR0A register allows the device to operate in an 8 byte FIFO mode if strict compliance with the SC26C92 FIFO structure is required.

The Texas Instruments TL28L92 Dual Universal Asynchronous Receiver/Transmitter (DUART) is a single-chip CMOS-LSI communications device that provides two full-duplex asynchronous receiver/transmitter channels in a single package.

特性

• SC28L92 Pin Compatible
• 3.3 V to 5.0 V, –40°C to 85°C and 68xxx or
  80xxx Bus Interface
• Dual Full-Duplex Independent Asynchronous
  Receiver/Transmitters 16 Character FIFOs for
  Each Receiver and Transmitter
• Pin Programming Selects 68xxx or 80xxx Bus
  Interface
• Programmable Data Format
  • 5 Data to 8 Data Bits Plus Parity
  • Odd, Even, No Parity or Force Parity
  • 1 Stop, 1.5 Stop or 2 Stop Bits
    Programmable in 1/16-Bit Increments
• 16-Bit Programmable Counter/Timer
• Programmable Baud Rate for Each Receiver
  and Transmitter Selectable From:
  • 28 Fixed Rates: 50 Bd to 230.4 kBd
  • Other Baud Rates to 1 MHz at 16×
  • Programmable User-Defined Rates Derived
    From a Programmable Counter/Timer
• External 1× or 16× Clock
• Parity, Framing, and Overrun Error Detection
• False Start Bit Detection
• Line Break Detection and Generation
• Programmable Channel Mode
  • Normal (Full-Duplex)
  • Automatic Echo