Conventions; Operand Symbols And Description - NEC mPD178054 Series User Manual

18.1 Conventions

18.1.1 Operand symbols and description

Operands are written in the "Operand" column of each instruction in accordance with the description of the
instruction operand symbols (refer to the assembler specifications for detail). When there are two or more descriptions,
select one of them. Alphabetic letters in capitals and symbols, #, !, $ and [ ] are key words and must be written as
they are. Each symbol has the following meaning.
• #: Immediate data specification
• !: Absolute address specification
• $: Relative address specification
• [ ]: Indirect address specification
In the case of immediate data, write an appropriate numeric value or a label. When using a label, be sure to write
the #, !, $, and [ ] symbols.
For operand register symbols, r and rp, either function names (X, A, C, etc.) or absolute names (names in
parentheses in the table below, R0, R1, R2, etc.) can be used.
Symbol
r X (R0), A (R1), C (R2), B (R3), E (R4), D (R5), L (R6), H (R7),
rp AX (RP0), BC (RP1), DE (RP2), HL (RP3)
sfr Special-function register symbol
sfrp Special-function register symbol (16-bit manipulatable register even addresses only)
saddr FE20H to FF1FH Immediate data or labels
saddrp FE20H to FF1FH Immediate data or labels (even address only)
addr16 0000H to FFFFH Immediate data or labels
(Only even addresses for 16-bit data transfer instructions)
addr11 0800H to 0FFFH Immediate data or labels
addr5 0040H to 007FH Immediate data or labels (even address only)
word 16-bit immediate data or label
byte 8-bit immediate data or label
bit 3-bit immediate data or label
RBn RB0 to RB3
Note Addresses from FFD0H to FFDFH cannot be accessed with these operands.
Remark For special function register symbols, refer to Table 3-4 Special Function Registers.
CHAPTER 18 INSTRUCTION SET
Table 18-1. Operand Symbols and Descriptions
Note
User's Manual U15104EJ2V0UD
Description
Note
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