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CPI Compare Immediate Instruction
The 8 bit data specified in the instruction is compared with the contents of the accumulator. The comparison is done by subtracting the 8 bit data form the contents of the accumulator the contents of the accumulator d not change. The flags are modified similar to subtraction. The instruction format is
CPI 8 bit data (A- 8bit data )
Flags : All flags are modified as they would change in subtract operation but the content of both the operand do no to change.
Although all flags are modified but the conclusion can be made only by CY and Z flag as shown below .
IF A> 8 bit data CY and Z Flags are reset.
IF A =8 bit data Z flag is set and CY flag is reset.
IF A < 8 bit CY is set and Z flag is reset.
Example of binary subtraction of Negative number Case 2. Negative number is more than the positive number ( i e, answer is negative) Example : Subtract 92 10 ( 101
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