Hello,
Apologize for delay in reply on this one. The PWM generator on ADSP-BF506 is capable of operating in two distinct modes, Single - Update Mode and Double - Update Mode.
In single-update mode, duty cycle values are programmable only once per PWM period; resultant PWM patterns are symmetrical about the midpoint of the PWM period.
But in double-update mode, a second updating of the PWM registers is implemented at the midpoint of the PWM period, and you can reprogram the duty cycle values again at this point. Hence, it is possible to produce asymmetrical PWM patterns.
Thanks,
Jithul