Epson S5U1C62000A, Manual

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56
EPSON
S5U1C62000A MANUAL
(S1C60/62 FAMILY ASSEMBLER PACKAGE)
CHAPTER 5: ASSEMBLER
5.5.4 Comments
Comments are used to describe a series of routines, or the meaning of each statement. Comments cannot
comprise part of coding.
Definition of comment
A character string beginning with a semicolon (;) and ending with a line feed code (LF) is interpreted
as a comment. Not only ASCII characters, but also other non-ASCII characters can be used to describe
a comment.
Examples:
;This line is a comment line.
LABEL: ;This is the comment for LABEL.
ld a,b ;This is the comment for the instruction on the left.
Restrictions
• A comment is allowed up to 259 characters, including a semicolon (;), spaces before, after and inside
the comment, and a return/line feed code.
• When a comment extends to several lines, each line must begin with a semicolon.
Examples:
;These are
comment lines.
... The second line will not be regarded as a comment. An error will
result.
;These are
; comment lines.
... Both lines will be regarded as comments.
5.5.5 Blank Lines
This assembler also allows a blank line containing only a return/line feed code. It need not be made into a
comment line using a semicolon.
5.5.6 Register Names
The CPU register names may be written in either uppercase or lowercase letters.
Table 5.5.6.1 Notations of register names
Register/memory location/flag Notation
A A register a or A
B B register b or B
XP Four high-order bits of IX register xp or XP
YP Four high-order bits of IY register yp or YP
X Eight low-order bits of IX register x or X
Y Eight low-order bits of IY register y or Y
XH Four high-order bits of XHL register xh or XH
XL Four low-order bits of XHL register xl or XL
YH Four high-order bits of YHL register yh or YH
YL Four low-order bits of YHL register yl or YL
SP Stack pointer SP sp or SP
SPH Four high-order bits of stack pointer SP sph or SPH
SPL Four low-order bits of stack pointer SP spl or SPL
MX Data memory location whose address is specified by IX mx or MX
MY Data memory location whose address is specified by IY my or MY
M0–MF Data memory location in the register area (0x000–0x00f) m0–mf or M0–MF
F Flag register (IDZC) f or F
C Carry c or C
NC No carry nc or NC
Z Zero z or Z
NZ Not zero nz or NZ
Note: These symbols are reserved words, therefore they cannot be used as user-defined symbol names.