SCPS299B May   2025  – July 2026 TXE8124-Q1

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 SPI Bus Timing Requirements
    8. 5.8 Switching Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 I/O Port
      2. 7.3.2 Interrupt Output (INT)
      3. 7.3.3 Reset Input (RESET)
      4. 7.3.4 Bus Hold
      5. 7.3.5 Fail-safe Mode
      6. 7.3.6 Software Reset Call
      7. 7.3.7 Daisy Chain
      8. 7.3.8 Multi Port
      9. 7.3.9 Feature Register Mapping
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power-On Reset
    5. 7.5 Programming
      1. 7.5.1 SPI
      2. 7.5.2 SPI Data Format
      3. 7.5.3 Burst Mode
      4. 7.5.4 SPI Write
      5. 7.5.5 SPI Read
      6. 7.5.6 SPI Daisy Chain
    6. 7.6 TXE8124 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power-On Reset Requirements
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 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
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.8 Multi Port

As shown in Section 7.5.2, the LSB of the second byte enables the multi-port feature. When this bit is 1, each bit of the following write data byte on SDI refers to individual ports. So, LSB bit B0 refers to P0 port, B1 refers to P1 port, B2 refers to P2 port. All I/Os in a particular port will have the same configuration when multi-port programming is used. During a multi-port access, the SDO will output the first byte with fault status register value, followed by 0s for the data byte.