How to enable direct PWM mode on BOOST-DRV8711 via f28069m piccolo launchpad?

I am unclear how to set the the PWMMODE bit in the OFF register

I have read through the user guide and the data sheet for the DRV8711 however I was unable open the firmware supplied in CCSv5 or CCSv6

I am trying to use Simulink to upload a model to control the H-bridges via an external PWM signal

Any help or advice would be greatly appreciated