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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.63 OR (OR Byte Data of Accumulator and Memory to
Accumulator)
Carry out the logical OR on AL and EA memory (memory expressed in each type of
addressing) for every bit and return the results to AL. The contents of AH are not
changed.
■ OR (OR Byte Data of Accumulator and Memory to Accumulator)
Operation
(AL) ← (AL)∨ (EA) (byte logical OR)
Assembler format
OR A, EA
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
R: Set to 0 by executing instruction
N: Set to 1 if the MSB of AL is 1 as the result of operation and set to 0 in other cases.
Z: Set to 1 if the result of operation is 00
H
and set to 0 in other cases.
V: Always set to 0
C: Not changed
NZVC
++R-
Table 6.63-1 Number of Execution Cycles / Byte Count / OP Code
EA #d8 dir @IX+off @EP Ri
Number of
execution cycles
23 3 2 2
Byte count 2 2 2 1 1
OP code 74 75 76 77 78 to 7F