Register Indirect Addressing - NEC 78K0 User Manual

3.4.6 Register indirect addressing

[Function]
Register pair contents specified by a register pair specify code in an instruction word and by a register bank
select flag (RBS0 and RBS1) serve as an operand address for addressing the memory. This addressing can be
carried out for all the memory spaces.
[Operand format]
Identifier
[Description example]
MOV A, [DE]; when selecting [DE] as register pair
[Illustration]
16
DE
The contents of the memory
addressed are transferred.
7
A
CHAPTER 3 CPU ARCHITECTURE
−
[DE], [HL]
Operation code
8 7
D
7
0
User's Manual U16227EJ2V0UD
Description
1 0 0 0 0 1 0 1
0
E
Memory 0
The memory address
specified with the
register pair DE
71