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UM0144 bảng dữ liệu(PDF) 53 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) 53 Page - STMicroelectronics

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ST7 Assembler Linker
UM0144
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A.12
DS.B
Purpose:
Define byte space in object code.
Format:
DS.B [optional number of bytes]
Description:
This directive is used to 'space out' label definitions. For example let's say we need a
set of byte-sized temporary storage locations to be defined in RAM, starting at
address $4000. We could write:
segment byte at 4000 'RAM'
temp1
equ $4000
temp2
equ $4001
which would work fine, however, we recommend you to write:
segment byte at 4000 'RAM'
temp1
DS.B
temp2
DS.B
which does the same job. The advantage is that the PC increments automatically.
There are two other types of DS instructions available for doing WORD and LONG
length storage areas: DS.W and DS.L. Note that the areas in question are not initial-
ized to any value; it's merely a way of allocating values to labels.
The optional argument specifies how many bytes to allocate; the default is 1.
Because no code is generated to fill the space, you are not allowed to use DS.B in
segments containing code, only for segments with data definitions.
Example:
See Also:
DS.W, DS.L
labl
DS.B



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