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UPD780138 Datasheet(PDF) 87 Page - NEC

No. de Pieza. UPD780138
Descripción  8-Bit Single-Chip Microcontrollers
Descarga  558 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD780138 Datasheet(HTML) 87 Page - NEC

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CHAPTER 3 CPU ARCHITECTURE
User’s Manual U16228EJ2V0UD
87
3.4.7 Based addressing
[Function]
8-bit immediate data is added as offset data to the contents of the base register, that is, the HL register pair in
the register bank specified by the register bank select flag (RBS0 and RBS1), and the sum is used to address
the memory. 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]
Identifier
Description
[HL + byte]
[Description example]
MOV A, [HL + 10H]; when setting byte to 10H
Operation code
1
010111
0
0
001000
0
[Illustration]
16
0
8
H
7
L
0
7
7
0
A
HL
The contents of the memory
addressed are transferred.
Memory
+10


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