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TM4C1294NCPDT: TM4C1294NCPDT startup time

Part Number: TM4C1294NCPDT

Hi,

The following figure is the time I measured "power supply to TM4C1294NCPDT to execute main in 0x0 program"
Among them, yellow is the power supply, and blue LOW->HING is the GPIO pk7 that is pulled high at the beginning of main in the 0x0.

Below is where the GPIO pk7 was pulled high.

Then my question is this, is there a way to shorten this time: "Power supply to TM4C1294NCPDT to execute 0x0 program main"?

Regards

Chin

  • Hi Chin,

      Reading your code, I think you are already using the default PIOSC (the internal 16Mhz) as the clock source which has a much faster startup time than the external crystal. This means what you are seeing is as fast as it can get in my opinion. 

      I will suggest you do another experiment by configuring the PLL  as the clock source for comparison purpose although I think the time from power-on to PK7 assertion will be even slower. 

    ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
    SYSCTL_OSC_MAIN |
    SYSCTL_USE_PLL |
    SYSCTL_CFG_VCO_240), 120000000);