SWRZ079D january   2018  – june 2023 CC2642R

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Advisories Matrix
  5. 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
  6. 3Advisories
    1.     Radio_03
    2.     Power_03
    3.     PKA_01
    4.     PKA_02
    5.     I2C_01
    6.     I2S_01
    7.     CPU_01
    8.     CPU_02
    9.     CPU_03
    10.     CPU_Sys_01
    11.     Sys_01
    12.     Advisory Sys_05
    13.     SYSCTRL_01
    14.     SRAM_01
    15.     GPTM_01
    16.     ADC_01
    17.     ADC_02
    18.     ADC_03
    19.     ADC_04
    20.     ADC_05
  7. 4Revision History

CPU_Sys_01

The SysTick calibration value (register field CPU_SCS.STCR.TENMS) used to set up 10-ms periodic ticks is incorrect when the system CPU is running off divided down 48-MHz clock

Revisions Affected:

Revision F and earlier

Details:

When using the Arm® Cortex® SysTick timer, the TENMS register field (CPU_SCS.STCR.TENMS) will always shows the value corresponding to a 48-MHz CPU clock, regardless of the CPU division factor.

Workarounds:

One of the following two workarounds must be implemented:

Workaround 1: Do not use a divided down system CPU clock. In general, power savings are maximized by completing a task at full clock speed and then stopping the system CPU entirely after the task is complete.

 

Workaround 2: Read the system CPU division factor from the PRCM.CPUCLKDIV.RATIO register and compensate the TENMS field in software based on this value.

TI-provided drivers do not offer any functionality to divide the system CPU clock.