about Microcontroller 8051,HELP?

Question

if the degree( rate) of frequency of crystal in microcontrol 8051 change more to be 8051 az 24 MHZ , so what's the result? or whats happen?

Answer 1

i dont understand your question, could you rephrase it?
are you asking what happens if you change the frequency of the crystal? your program will speed up if you increase it, and slow down if you decrease it. also if you are using timers and the UART they will also speed up (or slow down). in the case of the UART it will not be at the proper baud rate.

if you are asking if you speed it up above the max rated frequency, then it may not work at all, especially at high or low temperature ranges.