SLLS177I March   1994  – March 2021 TL16C550C

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  Recommended Operating Conditions (Low Voltage - 3.3 nominal)
    3. 5.3  Recommended Operating Conditions (Standard Voltage - 5 V nominal)
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics (Low Voltage - 3.3 V nominal)
    6. 5.6  Electrical Characteristics (Standard Voltage - 5 V nominal)
    7. 5.7  System Timing Requirements
    8. 5.8  System Switching Characteristics
    9. 5.9  Baud Generator Switching Characteristics
    10. 5.10 Receiver Switching Characteristics
    11. 5.11 Transmitter Switching Characteristics
    12. 5.12 Modem Control Switching Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Autoflow Control (see Figure 1-1)
    2. 7.2 Auto-RTS (see Figure 1-1)
    3. 7.3 Auto-CTS (see Figure 1-1)
    4. 7.4 Enabling Autoflow Control and Auto-CTS
    5. 7.5 Auto-CTS and Auto-RTS Functional Timing
    6. 7.6 Functional Block Diagram
    7. 7.7 Principles of Operation
      1. 7.7.1  Accessible Registers
      2. 7.7.2  FIFO Control Register (FCR)
      3. 7.7.3  FIFO Interrupt Mode Operation
      4. 7.7.4  FIFO Polled Mode Operation
      5. 7.7.5  Interrupt Enable Register (IER)
      6. 7.7.6  Interrupt Identification Register (IIR)
      7. 7.7.7  Line Control Register (LCR)
      8. 7.7.8  Line Status Register (LSR)
      9. 7.7.9  Modem Control Register (MCR)
      10. 7.7.10 Modem Status Register (MSR)
      11. 7.7.11 Programming Baud Generator
      12. 7.7.12 Receiver Buffet Register (RBR)
      13. 7.7.13 Scratch Register
      14. 7.7.14 Transmitter Holding Register (THR)
  8. 8 Application Information
  9. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.5 Auto-CTS and Auto-RTS Functional Timing

GUID-20210201-CA0I-5ZRX-9PNZ-MCKNJGWXVLJX-low.png Figure 7-2 CTS Functional Timing Waveforms

NOTES:

  1. When CTS is low, the transmitter keeps sending serial data out.
  2. If CTS goes high before the middle of the last stop bit of the current byte, the transmitter finishes sending the current byte but it does not send the next byte.
  3. When CTS goes from high to low, the transmitter begins sending data again.

The receiver FIFO trigger level can be set to 1, 4, 8, or 14 bytes. These are described in Figure 7-3 and Figure 7-4.

GUID-20210201-CA0I-ZWJD-7M8D-JCBMJ4JXD6GQ-low.png Figure 7-3 RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 1, 4, or 8 Bytes

NOTES:

  1. N = RCV FIFO trigger level (1, 4, or 8 bytes)
  2. The two blocks in dashed lines cover the case where an additional byte is sent as described in the preceding auto-RTS section.

GUID-20210201-CA0I-1LXZ-XPVD-PDJZB7Z472JV-low.png Figure 7-4 RTS Functional Timing Waveforms, RCV FIFO Trigger Level = 14 Bytes

NOTES:

  1. RTS is deasserted when the receiver receives the first data bit of the sixteenth byte. The receive FIFO is full after finishing the sixteenth byte.
  2. RTS is asserted again when there is at least one byte of space available and no incoming byte is in processing or there is more than one byte of space available.
  3. When the receive FIFO is full, the first receive buffer register read reasserts RTS.