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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.21 ORB (Or Byte Data of Source Register to Data in Memory)
Takes the logical OR of the byte data at memory address "Ri" and the byte data in "Rj",
stores the results to the memory address corresponding to "Ri".
The CPU will not accept hold requests between the memory read operation and the
memory write operation of this request.
■ ORB (Or Byte Data of Source Register to Data in Memory)
Assembler format: ORB Rj, @Ri
Operation: (Ri) or Rj → (Ri)
Flag change:
N: Set when the MSB (bit 7) of the operation result is "1", cleared when the MSB is "0".
Z: Set when the operation result is "0", cleared otherwise.
V and C: Unchanged
Execution cycles: 1 + 2a cycles
Instruction format:
NZVC
CC– –
MSB LSB
10010110 Rj Ri