How to use timer to output 2 way phase opposite PWM signal

Hi,

How to use timer to output 2 way phase opposite PWM signal? I want use two GPIO to driver Buzzer.
For example, I want one PWM output: (0, 1, 1, 0) signal when another PWM output (1, 0, 0, 1). This will make buzzer sound more loudly;

thanks.