As long as you can accept using the same carrier frequency it is possible to synchronise the timers on the MTU to provide up to 12 channels of PWM. This is achived using channels 0..2 in PWM mode 2 and channles 3..4 in PWM mode 1. PWM mode 2 provides 1 PWM output per compare match and PWM mode 1 provides 1 output for a p[air of compare matches. Ie. 4 + 2 + 2 + (4/2) + (4/2) = 12. The SH1 ITU can provide 5 PWM outputs as only PWM mode 2 is supported.