Hello!
I'm new user of 8051 microcontrollers. Until now I used Microchip microcontrollers but for this project I have to use AT89S52 and KEIL C compiler.
My question is how can I set one pin of the microcontroller to be input or output?

In one exmples I found the following line (in C language):

P2_0 = 1; /* Configure P2.0 as an input */

But how does the compiler make the difference between setting P2.0 as input and putting a high level on pin P2.0?

Thank you!