What is the resolution of a PWM prescaler, a frequency divider, and a timer?

[a_ziliu]

Each PWM in most of the NuMicro? series consists of an 8-bit prescaler, a 1/2/4/8/16 frequency divider and two 16-bit timers. However, each PWM in the M451 series consists of an 12-bit prescaler and two 16-bit timers.