UM0144 datasheet(71/92 Pages) STMICROELECTRONICS

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ST7 Assembler Linker

UM0144

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A.50

SEGMENT

Purpose:

Start of new segment.

Format:

[<name>] SEGMENT <align> <combine> '<class>' [cod]

Description:

The SEGMENT directive is very important: every module in your program will need at

least one.

The <name> field may be up to 11 characters in length, and may include under-

scores. The <align> field is one of the following:

Align Type:

byte

no alignment; can start on any byte boundaries

word

aligned to next word boundaries if necessary, i.e., 8001=8002

para

aligned to the next paragraph (=16 bytes) boundary, i.e., 8001=8010

aligned to the next 64-byte boundary, i.e., 8001=8040

128

aligned to the next 128-byte boundary, i.e., 8001=8080

page

aligned to the next page (=256 bytes) boundary, i.e., 8001=8100

long

aligned to the next long-word(=4 bytes) boundary, i.e., 8001=8004

aligned to next 1K boundaries, i.e., 8001=8400

aligned to next 4K boundaries, i.e., 8001=9000

Combine: at

X[-Y]

Introduces new class that starts from X and goes through to address

Y. Address Y is optional.

<none>

Tack this code on the end of the last segment of this class.

common

Put the segment at the same address than other common segments

that have the same name, and note the longest length segment.

The optional [cod] suffix is a number from 0 to 9 - it decides into

which. COD file the linker sends the contents of this class. 0 is the de-

fault and is chosen if the suffix is left off. A suffix of 1-9 will cause the

linker to open the [cod] suffix, and send the contents of this class into

the cod file instead of the default. This allows bank switching to be

supported directly at link level- different code areas at the same ad-

dress can be separated out into different .cod files.

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