请问TM4C123GXL LAUNCH PAD可不可以操作寄存器

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？？