Epson S5U1C17001C Manual page 23

Symbol
imm3 3-bit immediate data
imm5 5-bit immediate data
imm7 7-bit immediate data
sign7 Signed 7-bit immediate data
sign8 Signed 8-bit immediate data
sign10 Signed 10-bit immediate data
imm13 13-bit immediate data
imm16 16-bit immediate data
sign16 Signed 16-bit immediate data
imm20 20-bit immediate data
sign21 Signed 21-bit immediate data
sign23 Signed 23-bit immediate data
imm24 24-bit immediate data
sign24 Signed 24-bit immediate data
(3) Symbols
In specifying an address with immediate data, you can use a symbol defined in the source files.
 Definition of symbols 
Usable symbols are defined as 24-bit values by any of the following methods:
1. It is described as a label (in text, data or bss section)
Example: LABEL1:
LABEL1 is a symbol that indicates the address of a described location in the .text, .data, or .bss
section.
2. It is defined with the .set directive
Example: .set ADDR1,0xff00
ADDR1 is a symbol that represents absolute address 0x00ff00.
 Restrictions on characters 
The characters that can be used are limited to the following:
A–Z a–z _ 0–9
Note that a symbol cannot begin with a numeral. Uppercase and lowercase characters are discriminated.
 Local and global symbols 
Defined symbols are normally local symbols that can only be referenced in the file where they are defined.
Therefore, you can define symbols with the same name in multiple files.
To reference a symbol defined in some other file, you must declare it to be global in the file where the symbol is defined by
using the .global directive.
 Extended notation of symbols

When referencing an address with a symbol, you normally write the name of that symbol in the operand where an address
is specified.
call
Example:
ld.a
The as assembler also accepts the referencing of an address with a specified displacement as shown below.
LABEL + imm24 LABEL + sign24
Example: xcall
S5U1C17001C Manual
(Rev. 1.0)
Table 2.3.2.1 Types of immediate data and their specifiable ranges
Type Decimal
0 to 7
0 to 31
0 to 127
-64 to 63
-128 to 127
-512 to 511
0 to 8,191
0 to 65,535
-32,768 to 32,767
0 to 1,048,575
-1,048,576 to 1,048,575
-4194304 to 4194303
0 to 16,777,215
-8,388,608 to 8,388,607
← LABEL = sign10
LABEL
%rd,LABEL ← LABEL = sign7
LABEL+0x10
Seiko Epson Corporation
Hexadecimal
0x0 to 0x7 0b0 to 0b111
0x0 to 0x1f 0b0 to 0b1 1111
0x0 to 0x7f 0b0 to 0b111 1111
0x0 to 0x7f 0b0 to 0b111 1111
0x0 to 0xff 0b0 to 0b1111 1111
0x0 to 0x3ff 0b0 to 0b11 1111 1111
0x0 to 0x1fff 0b0 to 0b1 1111 1111 1111
0x0 to 0xffff 0b0 to 0b1111 1111 1111 1111
0x0 to 0xffff 0b0 to 0b1111 1111 1111 1111
0x0 to 0xfffff 0b0 to 0b1111 1111 1111 1111 1111
0x0 to 0x1fffff 0b0 to 0b1 1111 1111 1111 1111 1111
0x0 to 0x7fffff 0b0 to 0b111 1111 1111 1111 1111 1111
0x0 to 0xffffff 0b0 to 0b1111 1111 1111 1111 1111 1111
0x0 to 0xffffff 0b0 to 0b1111 1111 1111 1111 1111 1111
2 Source Files
Binary
2-10