set value to GTCCRA and GTCCRB to generate a saw-wave PWM (RA6M3)

hi,

i'm studying RA6M3 for a potential project. I intend to use GPT to generate a PWM. I studied the FSP configurator, select a GPT module, it looks OK, user can set the  duty cycle for a PWM waveform.

but my application will be a saw-wave PWM, so I need to set value to GTCCRA and GTCCRB. but I didn't find where i can set the value for these two registers with FSP configurator? I may have to do it by directly writing registers in my code? 

appreciated for your help.