SPRZ545C July   2023  – March 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1

 

  1.   1
  2.   TMS320F28P65x MCUs Silicon Errata Silicon Revisions A, 0
  3. 1Usage Notes and Advisories Matrices
    1. 1.1 Usage Notes Matrix
    2. 1.2 Advisories Matrix
  4. 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
  5. 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
      2. 3.1.2 Caution While Using Nested Interrupts
      3. 3.1.3 GPIO: GPIO Data Register is Reset by CPU1 Reset Only
      4. 3.1.4 Security: The primary layer of defense is securing the boundary of the chip, which begins with enabling JTAGLOCK and Zero-pin Boot to Flash feature
    2. 3.2 Silicon Revision A Advisories
      1.      Advisory
      2.      Advisory
      3. 3.2.1 Advisory
      4.      Advisory
      5. 3.2.2 Advisory
      6. 3.2.3 Advisory
      7.      Advisory
      8.      Advisory
      9.      Advisory
      10.      Advisory
      11.      Advisory
      12. 3.2.4 Advisory
      13.      Advisory
      14.      Advisory
      15.      Advisory
      16.      Advisory
  6. 4Silicon Revision 0 Usage Notes and Advisories
    1. 4.1 Silicon Revision 0 Usage Notes
    2. 4.2 Silicon Revision 0 Advisories
      1. 4.2.1 Advisory
  7. 5Documentation Support
  8. 6Trademarks
  9. 7Revision History

Advisory

MCD: Missing Clock Detect Should be Disabled When the PLL is Enabled (PLLCLKEN = 1)

Revisions Affected

0, A

Details

The PLL has a limp mode feature to provide a slow PLLRAWCLK output even if its input OSCCLK is absent. Independently, the Missing Clock Detect (MCD) circuit will forcibly switch the system clock source to INTOSC1 when a missing OSCCLK input is detected. The MCD mux to switch between these system clock sources is not ensured to be glitch-free when both clock sources (PLLRAWCLK and INTOSC1) are still active. In rare cases, this may lead to unpredictable device behavior during a missing clock failure event.

Workarounds

When the PLL is used by the system (PLLCLKEN = 1), disable the MCD by writing MCDCR.MCLKOFF = 1.

The Dual Clock Comparator (DCC) circuit can be configured to quickly detect if the SYSCLK frequency drops outside the desired frequency to its limp mode due to a missing clock event.

When the system is operating in PLL bypass mode (PLLCLKEN = 0), the MCD circuit can still be used to detect missing clock events and switch the clock source to INTOSC1.