If the start bit in the configuration register is set to 0, the PWM duty cycle register cannot be written to, however there appears to be a buffer register because after attempting to write to the PWM duty cycle register and then setting the start bit back to 1, the PWM duty cycle is automatically updated with the value. Setting the full speed bit of the configuration register doesn’t change the value in the PWM duty cycle register. Setting the mode to something other than manual mode does change the value in the PWM duty cycle register. The value is set back to the original value once the mode is set back to manual mode.
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