NEC switch - Manual (Page 200)

User’s Manual U12978EJ3V0UD
200
CHAPTER 15 INSTRUCTION SET
This chapter lists the instruction set of the
µPD789800 Subseries. For details of the operation and machine
language (instruction code) of each instruction, refer to 78K/0S Series Instruction User’s Manual (U11047E).
15.1 Operation
15.1.1 Operand identifiers and description methods
Operands are described in the “Operands” column of each instruction in accordance with the description method
of the instruction operand identifier (see the assembler specifications for details). When there are two or more
description methods, select one of them. Uppercase letters and the symbols #, !, $, and [ ] are keywords and are
described as they are. Each symbol has the following meaning.
• #: Immediate data specification • $: Relative address specification
• !: Absolute address specification • [ ]: Indirect address specification
In the case of immediate data, describe an appropriate numeric value or a label. When using a label, be sure to
describe the #, !, $ and [ ] symbols.
For operand register identifiers, 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 for description.
Table 15-1. Operand Identifiers and Description Methods
Identifier Description Method
r
rp
sfr
X (R0), A (R1), C (R2), B (R3), E (R4), D (R5), L (R6), H (R7)
AX (RP0), BC (RP1), DE (RP2), HL (RP3)
Special-function register symbol
saddr
saddrp
FE20H to FF1FH Immediate data or label
FE20H to FF1FH Immediate data or label (even addresses only)
addr16
addr5
0000H to FFFFH Immediate data or label (only even addresses for 16-bit data transfer instructions)
0040H to 007FH Immediate data or label (even addresses only)
word
byte
bit
16-bit immediate data or label
8-bit immediate data or label
3-bit immediate data or label
Remark See Table 3-2 Special Function Register List for symbols of special function registers.