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CHAPTER 4: ASSEMBLER
S5U1C63000A MANUAL EPSON 57
(S1C63 FAMILY ASSEMBLER PACKAGE)
4.5.6 Register Names
The CPU register names may be written in either uppercase or lowercase letters.
Table 4.5.6.1 Notations of register names
Register Notation
A Data register A %a, %A, a or A
B Data register B %b, %B, b or B
BA BA-register pair %ba, %BA, ba or BA
X Index register X %x, %X, x or X
XH Upper 8 bits of X-register %xh, %XH, xh or XH
XL Lower 8 bits of X-register %xl, %XL, xl or XL
Y Index register Y %y, %Y, y or Y
YH Upper 8 bits of Y-register %yh, %YH, yh or YH
YL Lower 8 bits of Y-register %yl, %YL, yl or YL
F Flag register F %f, %F, f or F
EXT Extension register EXT %ext, %EXT, ext or EXT
SP1 Stack pointer SP1 %sp1, %SP1, sp1 or SP1
SP2 Stack pointer SP2 %sp2, %SP2, sp2 or SP2
Note: "%" can be omitted. These symbols are reserved words, therefore they cannot be used as user-
defined symbol names.
4.5.7 Numerical Notations
This Assembler supports three kinds of numerical notations: decimal, hexadecimal, and binary.
Decimal notations of values
Notations represented with 0–9 only will be regarded as decimal numbers. To specify a negative
value, put a minus sign (-) before the value.
Examples: 1 255 -3
Characters other than 0–9 and the sign (-) cannot be used.
Hexadecimal notations of values
To specify a hexadecimal number, place "0x" before the value.
Examples: 0x1a 0xff00
"0x" cannot be followed by characters other than 0–9, a–f, and A–F.
Binary notations of values
To specify a binary number, place "0b" before the value.
Examples: 0b1001 0b1001100
"0b" cannot be followed by characters other than 0 or 1.
Specified ranges of values
The size (specified range) of immediate data varies with each instruction.
The specifiable ranges of different immediate data are given below.
Table 4.5.7.1 Types of immediate data and their specifiable ranges
Symbol
Type Decimal Hexadecimal Binary
imm2 2-bit immediate data 0–3 0x0–0x3 0b0–0b11
imm4 4-bit immediate data 0–15 0x0–0xf 0b0–0b1111
imm6 Software vectored interrupt address 0–64 0x0–0x3f 0b0–0b111111
imm8 8-bit immediate data 0–255 0x0–0xff 0b0–0b11111111
n4 4-bit n-ary specified data 1–16 0x1–0x10 0b0–0b10000
sign8 Signed 8-bit immediate data -128–127 0x0–0xff 0b0–0b11111111
add6 6-bit address 0–64 0x0–0x3f 0b0–0b111111