mahmood Elnasser wrote:

"... without knowing any single assembly instruction or registers or addressing modes of the 8051."

Sorry, but this can't believe.
It's impossible to use timers, interrupts, UARTs and so on without any knowledge about the needed registers. And without knowing addressing modes it's impossible to determine, what's code, data, EEPROM, bit space and so on.

You are a liar.

Also C programming on microcontrollers need good knowledge about the architecture and reading the data sheet carefully.


Peter