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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.

  

For more details on the instruction set,
refer to the “dsPIC30F/33F Programmer’s
Reference Manual” (DS70157).

#text

Means literal defined by “text”

(text)

Means “content of text”

[text]

Means “the location addressed by text”

{  }

Optional field or operation

<n:m>

Register bit field

.b

Byte mode selection

.d

Double Word mode selection

.S

Shadow register select

.w

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)

f

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

PC

Program Counter

Slit10

10-bit signed literal 

{-512...511}

Slit16

16-bit signed literal 

{-32768...32767}

Slit6

6-bit signed literal 

{-16...16}