1. A digital device, comprising: a digital function having adjustable power and speed parameters, the adjustable power and speed parameters being selectable for operating the digital function over different clock oscillator frequency ranges; logic circuits having adjustable power and speed parameters, the adjustable power and speed parameters being selectable for operating the logic circuits over the different clock oscillator frequency ranges; and a configuration register for storing programmable configuration bits used for selecting the adjustable power and speed parameters of the digital function and logic circuits.