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Lower Clock Frequencies on EK-TM4C1294XL Development Board

Expert 1070 points
Other Parts Discussed in Thread: EK-TM4C1294XL

Hello,


I am wanting to clock the EK-TM4C1294XL board at lower clock speeds, so I have removed the standard 25MHZ crystal and am driving the clock input with a function generator.  The board seems to run, but of course it messes up serial output (baud rates), etc, etc.  I am thinking the MAP_SysCtlClockFreqSet call would help at least some of this, but am not sure what the various parameters mean in this call.  Below is the stock call to set the clock parameters.

ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                           SYSCTL_OSC_MAIN |
                                           SYSCTL_USE_PLL |
                                           SYSCTL_CFG_VCO_480), 120000000);

Can someone shed some light on this and help me with the configuration of the board so that I could run the clock at say 1MHz?  Any help is greatly appreciated.

LER