The maximum clock frequency of the TM4C123GH6PMTR is 80 MHz, but it can be overclocked to 120 MHz with some limitations.
The pin muxing on the TM4C123GH6PMTR can be configured using the Pin Mux Utility tool provided by Texas Instruments, or by manually setting the registers in the System Control Module (SYSCTL).
The main difference between the TM4C123GH6PMTR and the TM4C1294NCPDT is the amount of flash memory and SRAM. The TM4C123GH6PMTR has 256 KB of flash and 32 KB of SRAM, while the TM4C1294NCPDT has 1 MB of flash and 256 KB of SRAM.
The ADC on the TM4C123GH6PMTR can be used by configuring the ADC module, selecting the input channel, and starting the conversion. The ADC result can be read from the ADC FIFO or by using the ADC interrupt.
Yes, the TM4C123GH6PMTR can be used with an operating system like Linux or FreeRTOS. However, it requires porting the OS to the specific microcontroller and configuring the peripherals and drivers accordingly.