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CHAPTER 4: ASSEMBLER
82 EPSON S5U1C63000A MANUAL
(S1C63 FAMILY ASSEMBLER PACKAGE)
4.7.15 Comment Adding Function
The preprocessing pseudo-instructions that begin with "#" are all expanded to codes that can be as-
sembled, and delivered in the preprocessed file. Even after that, those instructions are rewritten with
comments beginning with a semicolon (;), so that the original instructions can be identified. However,
note that the replacements of Define names will not subsist as comments.
The comment is added to the first line following the expansion. In case the original statement is accompa-
nied by a comment, that comment is also added.
A macro definition should have a semicolon (;) placed at top of the line.
Example:
• Before expansion
#define Areg %a
#macro ADDX2Y VALUE
ld Areg, VALUE
add Areg, [%x]
ld [%y], Areg
#endm
ADDX2Y 10h ; MX + 10h -> MY
• After expansion (no debugging information)
;#define Areg %a
;#macro ADDX2Y VALUE
; ld Areg, VALUE
; add Areg, [%x]
; ld [%y], Areg
;#endm
;ADDX2Y 10h ; MX + 10h -> MY
ld %a, 0x10
add %a, [%x]
ld [%y], %a
4.7.16 Priority of Pseudo-Instructions
Some remarks concerning the priority among the preprocessing pseudo-instructions will be given below:
1. The conditional assembly instructions (#ifdef, #ifndef) have the first priority. Nesting cannot be made
of those instructions.
2. Define instruction (#define), include instruction (#include), or macro instruction (#macro) can be
described within a conditional assembly instruction.
3. Define instruction (#define), include instruction (#include), and macro instruction (#macro) cannot be
described within a macro definition.
4. Define name definitions are expanded with priority over macro definitions.