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5.4.8 Based addressing
[Function]
8-bit immediate data is added to the contents of the base register, that is, the HL register pair, and the sum is used
to address the memory. The HL register pair to be accessed is in the register bank specified with the register bank
select flags (RBS0 and RBS1). The offset data as a positive number is expanded to 16 bits to be added. A carry
from the 16th bit is ignored. This addressing can be carried out for all the memory spaces.
[Operand format]
[Description example]
MOV A, [HL + 10H]; When setting byte to 10H
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CHAPTER 5 CPU ARCHITECTURE
Identifier
—
[HL + byte]
Instruction code 1
0
1
0
0
0
0
1
Description
1
1
1
0
0
0
0
0
127
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