TM4C123GXL LAUNCH PAD 可不可以操作寄存器，如果可以，寄存器地址从哪里找，有一部分寄存器找不到地址。

tm4c123gh6pm datasheet 715页

Each time a rising edge event is detected, the current count value is loaded into the GPTMTnR and
GPTMTnPS registers, and is held there until another rising edge is detected (at which point the new
count value is loaded into the GPTMTnR and GPTMTnPS registers).

 GPTMTnR and GPTMTnPS寄存器怎么读取，有没有读取寄存器的函数或者寄存器的地址？？