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Nearly all processors have addition, subtraction, comparison, increment and decrement instructions.
Some processors also have multiplication and division instructions.
Most processors perform operations between two internal registers or an internal register and a memory location.
The result of an operation is typically placed in an internal register.
In the 68HC12 processor, all addressing modes can be used with most arithmetic instructions. Typically one (or both) of the operands are in a register. For example, an addition operation will typically have one operand in an internal register and a second in memory.