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dsPIC30F3014/4013
DS70138G-page 160
2010 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
instruction. In these cases, the execution takes two
instruction
cycles
with
the
additional
instruction
cycle(s) executed as a NOP. Notable exceptions are the
BRA
(unconditional/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 “16-bit DSC and MCU Pro-
grammer’s
Reference
Manual”
(DS70157).
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>
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, Sticky 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}
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