PIC24EP256GU810-I Datasheet, PDF (486/622 Pages) Electronic Film Capacitors, Inc. – 16-Bit Microcontrollers and Digital Signal Controllers with High-Speed PWM, USB and Advanced Analog

dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
Most instructions are a single word. Certain double-word
instructions are designed to provide all the required
information 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 executes as a NOP.
The double-word instructions execute in two instruction
cycles.
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, or a PSV or table read is performed. In these
cases, the execution takes multiple instruction cycles
with the additional instruction cycle(s) executed as a
NOP. 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.
Note:
For more details on the instruction set,
refer to the “16-bit MCU and DSC
Programmer’s Reference Manual”
(DS70157).
TABLE 30-1: SYMBOLS USED IN OPCODE DESCRIPTIONS
Field
Description
#text
(text)
[text]
{}
a  {b, c, d}
<n:m>
.b
.d
.S
.w
Acc
AWB
bit4
C, DC, N, OV, Z
Expr
f
lit1
lit4
lit5
lit8
lit10
lit14
lit16
lit23
None
OA, OB, SA, SB
PC
Slit10
Slit16
Slit6
Wb
Wd
Wdo
Wm,Wn
Means literal defined by “text”
Means “content of text”
Means “the location addressed by text”
Optional field or operation
a is selected from the set of values b, c, d
Register bit field
Byte mode selection
Double-Word mode selection
Shadow register select
Word mode selection (default)
One of two accumulators {A, B}
Accumulator Write-Back Destination Address register {W13, [W13]+ = 2}
4-bit bit selection field (used in word addressed instructions) {0...15}
MCU Status bits: Carry, Digit Carry, Negative, Overflow, Sticky Zero
Absolute address, label or expression (resolved by the linker)
File register address {0x0000...0x1FFF}
1-bit unsigned literal {0,1}
4-bit unsigned literal {0...15}
5-bit unsigned literal {0...31}
8-bit unsigned literal {0...255}
10-bit unsigned literal {0...255} for Byte mode, {0:1023} for Word mode
14-bit unsigned literal {0...16384}
16-bit unsigned literal {0...65535}
23-bit unsigned literal {0...8388608}; LSb must be ‘0’
Field does not require an entry, can be blank
DSP Status bits: ACCA Overflow, ACCB Overflow, ACCA Saturate, ACCB Saturate
Program Counter
10-bit signed literal {-512...511}
16-bit signed literal {-32768...32767}
6-bit signed literal {-16...16}
Base W register {W0...W15}
Destination W register { Wd, [Wd], [Wd++], [Wd--], [++Wd], [--Wd] }
Destination W register 
{ Wnd, [Wnd], [Wnd++], [Wnd--], [++Wnd], [--Wnd], [Wnd+Wb] }
Dividend, Divisor Working register pair (Direct Addressing)
DS70616G-page 486
 2009-2012 Microchip Technology Inc.