76
EPSON
S5U1C62000A MANUAL
(S1C60/62 FAMILY ASSEMBLER PACKAGE)
CHAPTER 5: ASSEMBLER
.align pseudo-instruction
Instruction format
.align
<Alignment number>
<Alignment number>:
Word alignment in 2
n
value
• Only decimal, binary and hexadecimal numbers can be described.
• The alignment that can be specified is a 2
n
value.
• One or more spaces or tabs are necessary between the instruction and the alignment number.
Sample description:
.code
.align
32
... Sets the location to the next 32-word boundary address.
Function
Specifies location alignment in words of a CODE or BSS section in an assembly source file. The section
with the .align pseudo-instruction can be taken as a loosely absolute section in the sense that its
location is partially defined. This declaration does not allocate any memory space.
Precautions
• .align is applicable to any kinds of sections such CODE and BSS.
• When the .align pseudo-instruction appears in a section, a new absolute section starts at that point.
The section type does not change. The .align pseudo-instruction keeps its effect only in that section
until the next section definer (.code or .bss) or the next location definer (.org, .align, .page, or .bank)
appears.
Example:
:
.code
... The latest relocatable section definition.
:
.align 32
... Starts new loosely absolute CODE section from the next 32-word boundary address.
:
.bss
... This section is relocatable not affected by the ".align" pseudo-instruction.
:
.code
... This section is also relocatable not affected by the ".align" pseudo-instruction.
:
• If the .align pseudo-instruction is defined immediately after a section definer (.code or .bss), the
section definer does not start a new section. But .align starts a new section with the attribute of the
section definer.
Example:
.code
... This does not start a new CODE section.
.align 32
... This starts a loosely absolute CODE section.
:
• If the .align pseudo-instruction is defined immediately before a section definer (.code or .bss), it does
not start a new section and makes no effect to the following sections.
Example:
.code
... The latest relocatable section definition.
:
.align 32
... This does not start a new absolute section and makes no effect.
.bss
... The another kind (BSS) of section which is not affected by the
:
previous ".align" pseudo-instruction in the CODE section.
.code
... This will be an relocatable CODE section not affected by the
:
previous ".align" pseudo-instruction.
Summary of Contents for S5U1C62000A
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