I'd like to use an ATMEGA 328P on standalone mode powered by a 3.3V supply source to control a servo (which is powered by 4 AA batteries, resulting in 6V). My question is: do I have to convert the PWM signal's peak amplitude to 5V for it to work? Or will the servo work just fine with a 3.3V amplitude signal? My servo's datasheet says its operation voltage ranges from 4.8V to 6V, but I'm not sure if that applies only to its power source or if it has implications on the control signal as well.
Servo's datasheet: https://www.donkeyhoute.com/UploadFiles/2014916134245511.pdf
Also, since I will be using an 8 MHz external clock, do I have to change anything in my Arduino sketch regarding the PWM signal frequency, or do I just set the board to the 'Lilypad' option when burning the bootloader and keep the sketch the way it is now?