DSPIC30F datasheet(172/248 Pages) MICROCHIP

172 / 248 page

dsPIC30F

DS70083G-page 170

Preliminary

 2004 Microchip Technology Inc.

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

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

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

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 instructions,

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 Programmer’s Reference

Manual.

TABLE 21-1:

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, Sticky 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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