The Maple description states there are "22 PWM pins at 16-bit resolution", however in the PWN documentation page (http://leaflabs.com/docs/maple/pwm/) it groups the following number of pins to each timer:
Timer 1: 7 pins
Timer 2: 4 pins
Timer 3: 5 pins
Timer 4: 4 pins
= 20 pins
What are the 2 missing pins, and which timers are they controlled by?