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TMS470M Series Power Management Functionality

Roman Zavyalov
Intellectual 865 points

Other Parts Discussed in Thread: HALCOGEN

Hi

Using Halcogen 3.06 and CCS 5. 

Which power saving mode is enabled by default?

I need the fastest processor mode. Power saving fully disable. How to activate it?

  • 0
    TI__Guru 69070 points

    Roman,

    The two low power modes - doze and sleep - basically shut off the CPU entirely.  So they won't affect CPU performance.   Your CPU performance is simply going to depend on the PLL setting; and to a much lesser extent on the flash wait state settings.   [e.x. you might find that 27.9MHz with 0 DWS is faster than 30.1MHz with 1DWS but this should be a 2ndary consideration]

    Here is a description of low power modes.

     

  • 0 in reply to Anthony F. Seely
    TI__Guru 59540 points

    Hello Roman,

    The performance will be determined by the clock setup in Halcogen. For maximum performance, you would need to setup the PLL to 80MHz with 2 data waitstates with PLL enabled as the source for HCLK and VCLK = HCLK.

    The default setup of the clocks in Halcogen is configured for the max level of performance and there is no low power management (doze, sleep modes) enabled. Note that the configuration in Halcogen is based on a 16Mhz oscillator so it will need to be modified if a different oscillator clock is used. Note that you will also see the most power consumption at these settings so, if power consumption is a concern, you will need to "sweet spot" the system clock to achieve the best performance to power ratios as Anthony has mentioned.

  • 0 in reply to Roman Zavyalov
    Intellectual 865 points

    Thank you Chuck Davenport,

    i I set everything up that way