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About Timer_A Capture/Compare Register?

ferhat
Intellectual 380 points

In some code examples, it's about timer, capture/compare register's value,

TACCR0 = 50 >> 1;

What does '>>' function? If i write like this into capture/compare register what happens its value?

Thanks.

Ferhat

  • 0
    Guru 227245 points

    '>>' is a mathematical operator. It does a binary right shift by the given number of bits.

    50>>1 means the binary value 50 ( 00110010) is shifted right by 1 digit (00011001) which gives 25. So 'x >> y' is effectively a division of x by 2^y.

    Since the processor has its own instruction fo doing this, it is much faster (several magnitudes)  than dividing by two. But in this case, it is a constant anyway and the compiler will directly calculate the resulting 25.

    BTW: the opposite is a left shift and its operator is '<<', doing affectively a multiplication by 2, 4, 8 etc.

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