DSPIC33EP64GS708 datasheet(55/484 Pages) MICROCHIP

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dsPIC33EPXXXGS70X/80X FAMILY

4.6

Instruction Addressing Modes

The addressing modes shown in Table 4-17 form the

basis of the addressing modes optimized to support the

specific features of individual instructions. The address-

ing modes provided in the MAC class of instructions differ

from those in the other instruction types.

4.6.1

FILE REGISTER INSTRUCTIONS

Most file register instructions use a 13-bit address field (f)

to directly address data present in the first 8192 bytes

of data memory (Near Data Space). Most file register

instructions employ a Working register, W0, which is

denoted as WREG in these instructions. The destina-

tion is typically either the same file register or WREG

(with the exception of the MUL instruction), which writes

the result to a register or register pair. The MOV instruc-

tion allows additional flexibility and can access the

entire Data Space.

4.6.2

MCU INSTRUCTIONS

The three-operand MCU instructions are of the form:

Operand 3 = Operand 1 <function> Operand 2

where Operand 1 is always a Working register (that is,

the addressing mode can only be Register Direct),

which is referred to as Wb. Operand 2 can be a W

result location can either be a W register or a data

memory location. The following addressing modes are

supported by MCU instructions:

• Register Direct

• Register Indirect

• Register Indirect Post-Modified

• Register Indirect Pre-Modified

• 5-Bit or 10-Bit Literal

TABLE 4-17:

FUNDAMENTAL ADDRESSING MODES SUPPORTED

Note:

Not all instructions support all the

addressing modes given above. Individ-

ual instructions can support different

subsets of these addressing modes.

Addressing Mode

Description

File Register Direct

The address of the file register is specified explicitly.

The contents of a register are accessed directly.

The contents of Wn form the Effective Address (EA).

The contents of Wn form the EA. Wn is post-modified (incremented

or decremented) by a constant value.

Wn is pre-modified (incremented or decremented) by a signed constant value

to form the EA.

(Register Indexed)

The sum of Wn and Wb forms the EA.

The sum of Wn and a literal forms the EA.

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