The maximum clock frequency of the TM4C1237D5PMI7R is 80 MHz, but it can be overclocked to 120 MHz with careful consideration of power consumption and thermal management.
The pin muxing on the TM4C1237D5PMI7R can be configured using the PinMux utility in the TI Resource Explorer or by writing to the appropriate registers in the System Control Module (SYSCTL).
The main difference between the TM4C1237D5PMI7R and the TM4C1294NCPDT is the amount of flash memory and SRAM. The TM4C1237D5PMI7R has 512 KB of flash and 256 KB of SRAM, while the TM4C1294NCPDT has 1 MB of flash and 256 KB of SRAM.
Yes, the TM4C1237D5PMI7R can be used with an external crystal oscillator. The device has an internal oscillator, but it can also be driven by an external crystal oscillator connected to the XIN and XOUT pins.
The TM4C1237D5PMI7R has a built-in watchdog timer (WDT) that can be enabled and configured using the Watchdog Timer Module (WTM). The WDT can be used to reset the device in case of a software fault or hang.