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Think you. I modified my source :
printf("%lu * %bu = ", N, M); printf("%lu\n", Freq); Freq=25690112L; printf("%lu * %bu = ", Freq, 4); Freq*=4; printf("%lu\n", Freq);
It work correctly. but the Long Integer Multiple fault also.
Run Result: 24500000 * 4 = 4294926936 25690112 * 4 = 1568
You didn't answer the question:
Does the C8051F120F actually have an On-chip Arithmetic Accelerator?
and, if it does, do the Keil tools support it?