It looks like it has some details on "slow" i/o like UART and I2C, but not sure if that counts things like analog PWM timers for certain pins, like there are o

It looks like it has some details on "slow" i/o like UART and I2C, but not sure if that counts things like analog PWM timers for certain pins, like there are on RPis. Does anyone have any more information on that? You can do it all in software on a UART, but I think that can be a little more tricky. Since so many basic embedded projects can be helped with that kind of functionality, it would be awesome if it was available.