CHAPTER 3 CPU ARCHITECTURE
3.4.5 Register indirect addressing
[Function]
In the register indirect addressing mode, memory is manipulated according to the contents of a register pair
specified as an operand. The register pair to be accessed is specified by the register pair specification code
in an instruction code.
This addressing can be carried out for all the memory spaces.
[Operand format]
Identifier
Description
[DE], [HL]
−
[Description example]
MOV A, [DE]; When selecting register pair [DE]
Instruction code
0
0
1
0
1
0
1
1
[Illustration]
15
8
7
7
0
0
DE
D
E
Memory address
specified with
register pair DE.
Addressed memory
contents are
transferred.
7
0
A
User’s Manual U15075EJ1V0UM00
75
NEC [ NEC ]
