NEC uPD78078Y Manuale Utente
127
CHAPTER 5 CPU ARCHITECTURE
5.4.6 Register indirect addressing
[Function]
The memory is addressed with the contents of the register pair specified as an operand. The register pair to
be accessed is specified with the register bank select flag (RBS0 and RBS1) and the register pair specify code
in the 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 [DE] as register pair
Operation code
1 0 0 0 0 1 0 1
[Illustration]
16
0
8
D
7
E
Memory
The contents of addressed
memory are transferred
memory are transferred
Memory address specified
by register pair DE
by register pair DE
0
7
7 0
A
DE