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| 型號： | 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[01/2002] |
| 文件頁數(shù)： | 45/89頁 |
| 文件大小： | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
45
(c)
Based addressing
Indicates the memory address at which the value of the 16-bit base register (BW or BP) specified by the
memory addressing specification field in an operation code added to a sign extended displacement value
indicated by 1-byte or 2-byte data in an operation code is the read/write target of operand data.
When BP is selected as the base register, the default segment register becomes SS, and it can be used
when the data pushed to the stack as an argument in procedure calling is accessed from the procedure.
Example of usage:
MOV word_var [BW+2], AW
SUB AW, [BP+6]
; wordmem (offset (word_var)+BW+2)
←
AW
; AW
←
AW – wordmem (BP+6)
(d)
Indexed addressing
Indicates the memory address at which the value of the 16-bit indexed register (IX or IY) specified by the
memory addressing specification field in an operation code added to a sign extended displacement value
indicated by 1-byte or 2-byte data in an operation code is the read/write target of operand data.
Example of usage:
MOV word_var [IY+2], 0
SUB AW, [IX+6]
; wordmem (offset (word_var)+IY+2)
←
0
; AW
←
AW – wordmem (IX+6)
(e)
Addressing with based index
Indicates the memory address at which the value of the 16-bit base register (BW or BP) specified by the
memory addressing specification field in an operation code added to a sign extended displacement
indicated by 1-byte or 2-byte data in an operation code plus the value of the 16-bit index register (IX or IY) is
the read/write target of operand data. That is, it performs addressing similar to a combination of based
addressing and indexed addressing.
This addressing can be used to access data that has a 2-dimensional array structure, etc.
Example of usage:
MOV word_var [BW+6] [IY+2],0
SUB AW, [BP+6+IX]
; wordmem (offset (word_var)+BW+6+IY+2)
←
0
; AW
←
AW – wordmem (BP+IX+6)
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