TM4C internal clock configuration

Thank you for suggestion.

I don't have external clock connected on board. I am looking for stable clock source. Can you please suggest better value which will give know result in frequency which I wanted to generate PWM.

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16_3MHZ | SYSCTL_OSC_INT);

Are you sure, because I can see that API explanation says.

#define SYSCTL_XTAL_16MHZ       0x00000540  // External crystal is 16 MHz

Where I wanted to set  internal driven precision oscillator (PIOSC) and no XTAL is present.

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ | SYSCTL_OSC_INT);

>I don't have external clock connected on board.
Sounded like you were referring, last post see you confirmed Amit indeed No XTAL and No external clock source on custom PCB.

It would seem to me you may need call (SysCtlAltClkCfg) to also assign peripherals an alternate clock source. Perhaps you can use the internal PIOSC with PLL but check TM4C123 data sheet as there may be some restrictions.