DSPIC33EP128GS708 datasheet(55/484 Pages) MICROCHIP

55 / 484 page

 2016-2018 Microchip Technology Inc.

DS70005258C-page 55

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.

DSPIC33EP128GS708 датащи(PDF) 55 Page - Microchip Technology

DSPIC33EP128GS708 датащи(HTML) 55 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL