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dsPIC30F1010/202X

DS70178C-page 220

Preliminary

2006 Microchip Technology Inc.

Most single-word instructions are executed in a single

instruction cycle, unless a conditional test is true or the

Program Counter is changed as a result of the instruc-

tion. In these cases, the execution takes two instruction

cycles with the additional instruction cycle(s) executed

as a NOP. Notable exceptions are the BRA (uncondi-

tional/computed branch), indirect CALL/GOTO, all

Table Reads and Writes and RETURN/RETFIE instruc-

tions, which are single-word instructions, but take two

or three cycles. Certain instructions that involve

skipping over the subsequent instruction, require either

two or three cycles if the skip is performed, depending

on whether the instruction being skipped is a single-

word or two-word instruction. Moreover, double word

moves

require

two

cycles.

The

double

word

instructions execute in two instruction cycles.

Note:

For more details on the instruction set,

refer to the “dsPIC30F/33F Programmer’s

Reference Manual” (DS70157).

TABLE 19-1:

SYMBOLS USED IN OPCODE DESCRIPTIONS

Field

Description

#text

Means literal defined by “text”

(text)

Means “content of text”

[text]

Means “the location addressed by text”

{

}

Optional field or operation

<n:m>

Byte mode selection

Double Word mode selection

Shadow register select

Word mode selection (default)

Acc

One of two accumulators {A, B}

AWB

Accumulator write back destination address register

∈ {W13, [W13] + = 2}

bit4

4-bit bit selection field (used in word addressed instructions)

∈ {0...15}

C, DC, N, OV, Z

MCU Status bits: Carry, Digit Carry, Negative, Overflow, Zero

Expr

Absolute address, label or expression (resolved by the linker)

File register address

∈ {0x0000...0x1FFF}

lit1

1-bit unsigned literal

∈ {0,1}

lit4

4-bit unsigned literal

∈ {0...15}

lit5

5-bit unsigned literal

∈ {0...31}

lit8

8-bit unsigned literal

∈ {0...255}

lit10

10-bit unsigned literal

∈ {0...255} for Byte mode, {0:1023} for Word mode

lit14

14-bit unsigned literal

∈ {0...16384}

lit16

16-bit unsigned literal

∈ {0...65535}

lit23

23-bit unsigned literal

∈ {0...8388608}; LSB must be ‘0’

None

Field does not require an entry, may be blank

OA, OB, SA, SB

DSP Status bits: ACCA Overflow, ACCB Overflow, ACCA Saturate, ACCB Saturate

Program Counter

Slit10

10-bit signed literal

∈ {-512...511}

Slit16

16-bit signed literal

∈ {-32768...32767}

Slit6

6-bit signed literal

∈ {-16...16}

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