SPRZ171T December   2004  – September 2020 SM320F2801-EP , SM320F2808-EP , TMS320F2801 , TMS320F2801-Q1 , TMS320F28015 , TMS320F28016 , TMS320F28016-Q1 , TMS320F2802 , TMS320F2802-Q1 , TMS320F2806 , TMS320F2806-Q1 , TMS320F2808 , TMS320F2808-Q1 , TMS320F2809 , TMS320F2809-Q1

 

  1. 1Introduction
  2. 2Device and Development Tool Support Nomenclature
  3. 3Device Markings
  4. 4Silicon Change Overview
  5. 5Usage Notes and Known Design Exceptions to Functional Specifications
    1. 5.1 Usage Notes
      1. 5.1.1 PIE: Spurious Nested Interrupt After Back-to-Back PIEACK Write and Manual CPU Interrupt Mask Clear Usage Note
    2. 5.2 Known Design Exceptions to Functional Specifications
      1.      Advisory
      2.      Advisory
      3.      Advisory
      4.      Advisory
      5.      Advisory
      6.      Advisory
      7.      Advisory
      8.      Advisory
      9.      Advisory
      10.      Advisory
      11.      Advisory
      12.      Advisory
      13.      Advisory
      14.      Advisory
      15.      Advisory
      16.      Advisory
      17.      Advisory
      18.      Advisory
      19.      Advisory
      20.      Advisory
      21.      Advisory
      22.      Advisory
  6. 6Documentation Support
  7. 7Trademarks
  8. 8Revision History

Advisory

SCI: Bootloader Does Not Clear the ABD Bit After Auto-Baud Lock

Revision(s) Affected

0, A on F2809 silicon

0, A on C280x silicon

0, A, B, C on F2801, F2802, F2806, F2808, and F2801x silicon

Details

The SCI ROM bootloader code does not clear the Auto-Baud Detect (ABD) bit in the SCIFFCT register after the auto-baud process completes. If the SCI-A port is used after the bootloader is executed, transmit interrupts (SCITXINTA) will not be able to occur, nor will the auto-baud lock feature of SCI-A work correctly.

Workaround

If the SCI bootloader has been executed, the user’s application code should clear the ABD bit by writing a 1 to ABD CLR (bit 14) in the SCIFFCT register before enabling the SCITXINTA interrupt, and before using the auto-baud feature.