UPD780138 datasheet(86/558 Pages) NEC

Part #	UPD780138

Description	8-Bit Single-Chip Microcontrollers

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CHAPTER 3 CPU ARCHITECTURE

User’s Manual U16228EJ2V0UD

86

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

−

[DE], [HL]

[Description example]

MOV A, [DE]; when selecting [DE] as register pair

Operation code

1

000010

1

[Illustration]

16

0

8

D

7

E

0

7

0

A

DE

The contents of the memory

addressed are transferred.

Memory

The memory address

specified with the

register pair DE

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