Introduction - If you have any usage issues, please Google them yourself
PWM control on the steering gear with good information, you can directly copy the SYSCLK = 12MHz PCACLK = 1MHz and the system clock 48MHz, PCA clock 4MHz, PWM cycle of 70Hz, need 0x37CE* 4 = 0xDF36 a PWM cycle, after the overflow count increased to 0xFFFF