Hello

Does anyone know what is the maximum and minimum value of variable at 8 bit AD conversion (PIC 16f877A)

For example:

pw var byte

adcin 0, pw "read AD value on pin 0 and store it at variable pw"

now I am wondering what is the max and min value of that AD
is it 0 and 255 since variable is Byte or there is some formula to count that