SPRZ272N September   2007  – April 2022 SM320F28335-EP , SM320F28335-HT , TMS320F28232 , TMS320F28232-Q1 , TMS320F28234 , TMS320F28234-Q1 , TMS320F28235 , TMS320F28235-Q1 , TMS320F28332 , TMS320F28333 , TMS320F28334 , TMS320F28335 , TMS320F28335-Q1

 

  1. 1Usage Notes and Advisories Matrices
    1. 1.1 Usage Notes Matrix
    2. 1.2 Advisories Matrix
  2. 2Nomenclature, Package Symbolization, and Revision Identification
    1. 2.1 Device and Development Support Tool Nomenclature
    2. 2.2 Devices Supported
    3. 2.3 Package Symbolization and Revision Identification
    4. 2.4 Silicon Change Overview
  3. 3Silicon Revision A Usage Notes and Advisories
    1. 3.1 Silicon Revision A Usage Notes
      1. 3.1.1 PIE: Spurious Nested Interrupt After Back-to-Back PIEACK Write and Manual CPU Interrupt Mask Clear Usage Note
      2. 3.1.2 Caution While Using Nested Interrupts
      3. 3.1.3 Watchdog: Watchdog Issues Reset After Bad Key is Written
      4. 3.1.4 McBSP: XRDY Bit can Hold the Not-Ready Status (0) if New Data is Written to the DX1 Register Without First Verifying if the XRDY Bit is in its Ready State (1)
      5. 3.1.5 Maximum Flash Program Time and Erase Time in Revision O of the TMS320F2833x, TMS320F2823x Real-Time Microcontrollers Data Sheet
    2. 3.2 Silicon Revision A Advisories
      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
  4. 4Silicon Revision 0 Usage Notes and Advisories
    1. 4.1 Silicon Revision 0 Usage Notes
    2. 4.2 Silicon Revision 0 Advisories
      1.      Advisory
      2.      Advisory
      3.      Advisory
  5. 5Documentation Support
  6. 6Trademarks
  7. 7Revision History

Advisory

eQEP: eQEP Inputs in GPIO Asynchronous Mode

Revision(s) Affected

0, A

Details

If any of the eQEP input pins are configured for GPIO asynchronous input mode via the GPxQSELn registers, the eQEP module may not operate properly. For example, QPOSCNT may not reset or latch properly, and pulses on the input pins may be missed. This is because the eQEP peripheral assumes the presence of external synchronization to SYSCLKOUT on inputs to the module.

For proper operation of the eQEP module, input GPIO pins should be configured via the GPxQSELn registers for synchronous input mode (with or without qualification). This is the default state of the GPxQSEL registers at reset. All existing eQEP peripheral examples supplied by TI also configure the GPIO inputs for synchronous input mode.

The asynchronous mode should not be used for eQEP module input pins.

Workaround(s)

Configure GPIO inputs configured as eQEP pins for non-asynchronous mode (any GPxQSELn register option except “11b = Asynchronous”).