SWRZ138A July   2023  – August 2024 AWRL1432

 

  1.   1
  2. 1Introduction
  3. 2Device Nomenclature
  4. 3Device Markings
  5. 4Advisory to Silicon Variant / Revision Map
  6. 5Known Design Exceptions to Functional Specifications
    1. 5.1  ANA #51
    2. 5.2  ANA #52
    3. 5.3  DIG #1
    4. 5.4  DIG #2
    5. 5.5  DIG #3
    6. 5.6  DIG #4
    7. 5.7  DIG #5
    8. 5.8  DIG #6
    9. 5.9  DIG #7
    10. 5.10 DIG #8
    11. 5.11 DIG #9
    12. 5.12 DIG #10
    13. 5.13 DIG #14
    14. 5.14 DIG #15
    15. 5.15 DIG #16
  7. 6Trademarks
  8.   Revision History

5.5 DIG #3

UART: Limited UART baud rates

Revision(s) Affected

AWRL1432 ES1.1, ES2.0

Details

Due to a design limitation (related to the clocking scheme), UART doesn’t support standard baud rates above 115200 bits per second. Higher baud rates up to 1.25Mbps can be supported but they are non-standard.

Applications requiring UART cannot use standard baud rates above 115200 bits per second

Standard Baud Rates supported :

XTAL (MHz)

40

Ideal Baud rate (bps)

Actual Baud

Error %

115200

113636.36

1.36

76800

75757.58

1.36

Non- Standard baud rates supported:

XTAL (MHz)

40

Maximum baud (bps)

1250k

833.33k

625k

500k

416.66k

357.14k

312.5k

Workaround

It is recommended to use the following workarounds based on application needs:

  • Use of non-standard baud rates can provide up to 1.25Mbps throughput, if external MCU can support the same non-standard baud rates.

  • LIN (without external LIN PHY) can function as a UART, and offer up to 576 Kbps.

  • Use SPI instead, if use-case needs higher throughput.