參數(shù)資料
型號: μPD789806Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 39/125頁
文件大?。?/td> 366K
代理商: ΜPD789806Y
CHAPTER 3 ADDRESSING
22
3.2.6 Based Addressing
[Function]
8-bit immediate data is added to the contents of the base register, that is, the HL register pair, 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
Instruction code
0
0
1
0
1
1
0
1
0
0
0
1
0
0
0
0
3.2.7 Stack Addressing
[Function]
The stack area is indirectly addressed with the stack pointer (SP) contents.
This addressing method is automatically employed when the PUSH, POP, subroutine call and RETURN
instructions are executed or the register is saved/reset upon generation of an interrupt request.
Stack addressing enables to address the internal high-speed RAM area only.
[Description example]
In the case of PUSH DE
Instruction code
1
0
1
0
1
0
1
0
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