參數(shù)資料
型號: 780024Y
廠商: NEC Corp.
英文描述: Common to 78K/0 Series
中文描述: 共同的78K / 0系列
文件頁數(shù): 30/129頁
文件大?。?/td> 644K
代理商: 780024Y
30
CHAPTER 3 ADDRESSING
User's Manual U12326EJ4V0UM
3.2.7 Based addressing
[Function]
8-bit immediate data is added to the contents of the HL register pair as a base register and the sum is used
to address the memory. The HL register pair to be accessed is in the register bank specified by the register
bank select flag (RBS0 and RBS1). 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
Instruction code
1
0
1
0
1
1
1
0
0
0
0
1
0
0
0
0
3.2.8 Based indexed addressing
[Function]
The B or C register contents specified in an instruction word are added to the contents of the HL register
pair as a base register and the sum is used to address the memory. The HL, B, and C registers to be accessed
are registers in the register bank specified by the register bank select flag (RBS0 to RBS1). Addition is
performed by expanding the B or C register 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+B], [HL+C]
[Description example]
In the case of MOV A, [HL+B]
Instruction code
1
0
1
0
1
0
1
1
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