89s51 magnitude code

Hey guys wassup. i need with wiriting a code for comaring two 8 bit numbers in the 89s51 controller. basically there will be a value in the code already set. then through one of the port there will be a 8 bit value consitant coming for a adc. i was to compare that value to the value in the code and i want to know if it is < > or = to the value in the program.
can anyone help? :idea:
thx

help pls

Here is how you do it.