Robert,
The internal count is limited to 1 tic per machine cycle in most cases. In this case you get a tic every 12 clock cycles which is about every 0.3634us @ 33MHz.
There is no in between. On some 8051 derivatives there is a PCA counter (not on your part, though you do have capture)which will advance every clock cycle giving twelve times improvement in resolution.
Question(s):
Why do you need such resolution?
Why are you using a discontinued part?

Dallas has a newer part (C420 is the suffix I think) that runs at 50MHz and one machine cycle is accomplished per clock cycle. There you would have better resolution. But even here you are limited to the speed of the clock (digital world inside the 8051 you know). You could build an external counter for better resolution. What dou you need it for?!
Allen