Reading curnt consumption with 16F877A

[comwarrior]

I'm wanting to measure curent consumption of my pulse motor thats being ran from my 16F877A.
At the moment I'm using one analogue line for pulse timing and one to measure input voltage and display on an LCD...

What i'm after is a way of measuring curent consumption.
Normally, i'd measure the voltage across a resister and use V=IR...
But, a PIC using internal VREF (as mine is) cant measure the diference between two independant points...

as I see it, theirs two ways I could do it...
1)
Use the external VREF on the drain side of the resister and one analogue line on the source side and re-program for external VREF on the fly...

2)
Use two analogue lines (VIA voltage deviders) and subtract one from the other to get the voltage diference...

However, need to be aware that the source voltage is anywhere from 12 to 16 volts DC (hence the voltage deviders)
The smallest value resister I've got is 5ohms...

Can the external VREF handle such voltage?

If so, which is the faster / better way?

Is their a third way?

Any idea what the overhead is in terms of instructions associated with each option?

Thanks

:edit
Curent consumption should be only upto 200mA
so, V=IR
V=0.2 X 5
So, diference should be 1 volt or less

:edit2
Just found the a bit in the datasheet, Comparator voltage can not go above VDD, so that whould mean using a voltage devider on the VREF input too