Based Addressing - NEC mPD178054 Series User Manual

3.4.7 Based addressing

[Function]
This addressing mode is used to address a memory location specified by the result of adding the 8-bit immediate
data to the contents of the HL register pair which is used as a base register. The HL register pair accessed is
the register in the register bank specified by the register bank select flags (RBS0 and RBS1). Addition is performed
by expanding the offset data as a positive number to 16 bits. A carry from the 16th bit is ignored. This addressing
can be carried out for all the memory spaces.
[Operand format]
Symbol
—
[Example]
MOV A, [HL + 10H]; when setting byte to 10H
66
CHAPTER 3 CPU ARCHITECTURE
Description
[HL + byte]
Operation code 1 0 1 0 1 1 1 0
0 0 0 1 0 0 0 0
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