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Sheet目录3871

132页 133页 134页 135页 [136页]137页 138页 139页 140页

2006 Microchip Technology Inc.

Preliminary

DS70178C-page 219

dsPIC30F1010/202X

19.0

INSTRUCTION SET SUMMARY

The

dsPIC30F

instruction

set

adds

many

enhancements to the previous PIC MCU instruction

sets, while maintaining an easy migration from PIC

MCU instruction sets.

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 19-1 shows the general symbols used in

describing the instructions.

The dsPIC30F instruction set summary in Table 19-2

lists 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 modi-

fier) 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

All instructions are a single word, except for certain

double word instructions, which were made double

word instructions so that all the required information is

available in these 48 bits. In the second word, the

8MSbs are ‘0’s. If this second word is executed as an

instruction (by itself), it will execute as a NOP.

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the “dsPIC30F Family Reference

Manual” (DS70046). For more information on the device

instruction set and programming, refer to the “dsPIC30F/

33F Programmer’s Reference Manual” (DS70157).

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