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UM0144 bảng dữ liệu(PDF) 72 Page - STMicroelectronics

tên linh kiện UM0144
Giải thích chi tiết về linh kiện  ST7 Assembler Linker
PDF  92 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0144 bảng dữ liệu(HTML) 72 Page - STMicroelectronics

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UM0144
A.51
.SETDP
A.52
SKIP
Purpose:
Set base address for direct page.
Format:
.SETDP <base address>
Description:
If you have used an ST7 processor, you'll be aware of its 'zero-page' or 'direct'
addressing modes. These use addresses in the range 00..FF in shorter, faster
instructions than the more general 0000..FFFF versions. Other processors use the
same scheme, but with a twist: you can choose the 'base page' where the direct
mode does not have to be in range 0000 00FF but can be from nn00..nnFF where
nn00 is the 'base page', loaded into a register at run-time. Because the assembler
cannot track what's in the base page register at run-time, you need to fill it in about
the current 'base page' with the .SETDP directive. At the start of the assembly,
SETDP defaults to 0000.
Example:
See Also:
Purpose:
Inserts given number of bytes with an initialization value.
Format:
SKIP <number of bytes>,<value to fill>
Description:
This directive leaves a message for the linker that you want X number of Y bytes to
be inserted into the object code at this point. Both the arguments must be absolute
values rather than external or relative values.
Example:
See Also:
.SETDP $400
ld A,$401
; direct mode chosen
SKIP 100,$FF
; insert 100 bytes all $FF



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