DSPIC33FJ64GP706 datasheet(247/322 Pages) MICROCHIP

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DS70286C-page 245

dsPIC33FJXXXGPX06/X08/X10

23.0 INSTRUCTION SET SUMMARY

The dsPIC33F instruction set is identical to that of the

dsPIC30F.

Most instructions are a single program memory word

(24 bits). Only three instructions require two program

memory locations.

Each single-word instruction is a 24-bit word, divided

into an 8-bit opcode, which specifies the instruction

type and one or more operands, which further specify

the operation of the instruction.

The instruction set is highly orthogonal and is grouped

into five basic categories:

• Word or byte-oriented operations

• Bit-oriented operations

• Literal operations

• DSP operations

• Control operations

Table 23-1 illustrates the general symbols used in

describing the instructions.

The dsPIC33F instruction set summary in Table 23-2

provides all the instructions, along with the status flags

affected by each instruction.

Most word or byte-oriented W register instructions

(including barrel shift instructions) have three

operands:

• The first source operand which is typically a

• The second source operand which is typically a

• The destination of the result which is typically a

However, word or byte-oriented file register instructions

have two operands:

• The file register specified by the value ‘f’

• The destination, which could either be the file

‘WREG’

Most

bit-oriented

instructions

(including

simple

rotate/shift instructions) have two operands:

• The W register (with or without an address

modifier) or file register (specified by the value of

‘Ws’ or ‘f’)

• The bit in the W register or file register

(specified by a literal value or indirectly by the

contents of register ‘Wb’)

The literal instructions that involve data movement may

use some of the following operands:

• A literal value to be loaded into a W register or file

• The W register or file register where the literal

value is to be loaded (specified by ‘Wb’ or ‘f’)

However, literal instructions that involve arithmetic or

logical operations use some of the following operands:

• The first source operand which is a register ‘Wb’

without any address modifier

• The second source operand which is a literal

value

• The destination of the result (only if not the same

as the first source operand) which is typically a

The MAC class of DSP instructions may use some of the

following operands:

• The accumulator (A or B) to be used (required

operand)

• The W registers to be used as the two operands

• The X and Y address space prefetch operations

• The X and Y address space prefetch destinations

• The accumulator write back destination

The other DSP instructions do not involve any

multiplication and may include:

• The accumulator to be used (required)

• The source or destination operand (designated as

Wso or Wdo, respectively) with or without an

address modifier

• The amount of shift specified by a W register ‘Wn’

or a literal value

The control instructions may use some of the following

operands:

• A program memory address

• The mode of the table read and table write

instructions

Note:

This data sheet summarizes the features

of the dsPIC33FJXXXGPX06/X08/X10

family of devices. However, it is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to the related section

in the “dsPIC33F Family Reference

Manual”, which is available from the

Microchip web site (www.microchip.com).

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