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420 FUJITSU MICROELECTRONICS LIMITED CM71-00105-1E
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.171
7.171 XCHB (Exchange Byte Data)
Exchanges the contents of the byte address indicated by Rj and those indicated by Ri.
The lower 8 bits of data originally at Ri are transferred to the byte address indicated by
Rj and the data originally at Rj is extended with zeros and transferred to Ri.
● Assembler Format
XCHB @Rj, Ri
● Operation
Ri → TEMP
extu((Rj)) → Ri
TEMP → (Rj)
● Flag Change
N, Z, V, C: Unchanged.
● Classification
Other instructions, Read/Modify/Write type instruction
● Execution Cycles
2a cycles
● Instruction Format
NZVC
----
MSB LSB
10001010 Rj Ri