MikroElektronika PIC Microcontrollers PIC16 Specifiche Pagina 11

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mikroElektronika | Free Online Book | PIC Microcontrollers | Introduction: World of Microcontrollers
If a program, logic NOT operation is performed on one byte. The result is a byte with inverted
bits. If byte is considered to be a number, the inverted value is actually a complement of that
number, i.e. the complement of a number is what is needed to add to it to make it reach the
maximal 8 bit value (255).
EXCLUSIVE OR Gate
The EXCLUSIVE OR (XOR) gate is a bit complicated comparing to other gates. It represents a combination of all
the previously described gates. A logic one (1) appears on its output only when the inputs have different logic
states.
In a program, this operation is commonly used to compare two bytes. Subtraction may be
used for the same purpose (if the result is 0, bytes are equal). The advantage of this logic
operation is that there is no danger to subtract larger number from smaller one.
Register
A register or a memory cell is an electronic circuit which can memorize the state of one byte.
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