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| 型號(hào)： | V30MZ |
| 英文描述： | V30MZ(TM) Hardware (Preliminary) | User＇s Manual[01/2002] |
| 中文描述： | V30MZ（TM）硬件（初步）|用戶手冊(cè)[01/2002] |
| 文件頁(yè)數(shù)： | 44/89頁(yè) |
| 文件大?。?/td> | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
44
<1> imm8
8-bit data in an operation code specifies the I/O address.
In this method, specification is limited to a 256-byte space on the lower side of the 64-K byte I/O
space.
This specification method is used by the following two instructions.
IN
OUT
acc, imm8
imm8, acc
<2> DW
The content of DW indicates the I/O address.
This method can be used to specify across the entire 64-K byte I/O space. This specification method
is used by the following four instructions.
IN
INM
OUT
OUTM
acc, DW
dst_block, DW
DW, acc
DW, src_block
(2) Memory addressing
Memory addressing specifies the operand data in memory.
This memory addressing is further divided into several modes by the 5-bit memory addressing specification field
placed after an op-code. In all memory addressing modes, a 16-bit offset address from the segment base
specified by the default or segment override is specified. Memory addressing is shown in the following
description.
Description
Data Length
dme
m
mem
mem8
mem16
Note
8/16-bit data
8/16-bit data
8-bit data
16-bit data
Note
Description in an instruction that has no memory addressing specification field
(a)
Direct addressing
Indicates the memory address at which 2-byte data in an operation code is the read/write target of operand
data.
Example of usage:
MOV byte_var, 216 ; bytemem (offset (byte_var))
←
216
(b)
Register indirect addressing
Indicates the memory address at which the 16-bit register (BW or IX or IY) specified by the memory
addressing specification field in an operation code is the read/write target of operand data.
Example of usage:
MOV word ptr [BW], 10 ; wordmem (BW)
←
10
ADD AL, byte ptr [IX]
; AL
←
AL + bytemem (IX)
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