http://ww1.microchip.com/downloads/en/DeviceDoc/70157B.pdf

dsPIC30F/33F Programmer’s
Reference Manual
High-Performance
Digital Signal Controllers
© 2005 Microchip Technology Inc.
Preliminary
DS70157B
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
WRITTEN OR ORAL, STATUTORY OR OTHERWISE,
RELATED TO THE INFORMATION, INCLUDING BUT NOT
LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE,
MERCHANTABILITY OR FITNESS FOR PURPOSE.
Microchip disclaims all liability arising from this information and
its use. Use of Microchip’s products as critical components in
life support systems is not authorized except with express
written approval by Microchip. No licenses are conveyed,
implicitly or otherwise, under any Microchip intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB,
PICMASTER, SEEVAL, SmartSensor and The Embedded
Control Solutions Company are registered trademarks of
Microchip Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Linear Active Thermistor,
MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM,
PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo,
PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode,
Smart Serial, SmartTel, Total Endurance and WiperLock are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2005, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS70157B-page ii
Preliminary
© 2005 Microchip Technology Inc.
M
Table of Contents
PAGE
SECTION 1. INTRODUCTION
1-1
Introduction ...................................................................................................................................................... 1-2
Manual Objective ............................................................................................................................................. 1-2
Development Support ...................................................................................................................................... 1-2
Style and Symbol Conventions ........................................................................................................................ 1-3
Instruction Set Symbols ................................................................................................................................... 1-4
Related Documents .......................................................................................................................................... 1-5
SECTION 2. PROGRAMMER’S MODEL
2-1
dsPIC30F/33F Overview .................................................................................................................................. 2-2
Programmer’s Model ........................................................................................................................................ 2-3
SECTION 3. INSTRUCTION SET OVERVIEW
3-1
Introduction ...................................................................................................................................................... 3-2
Instruction Set Overview .................................................................................................................................. 3-2
Instruction Set Summary Tables ...................................................................................................................... 3-3
SECTION 4. INSTRUCTION SET DETAILS
4-1
Data Addressing Modes ................................................................................................................................... 4-2
Program Addressing Modes ........................................................................................................................... 4-11
Instruction Stalls ............................................................................................................................................. 4-12
Byte Operations ............................................................................................................................................. 4-13
Word Move Operations .................................................................................................................................. 4-16
Using 10-bit Literal Operands ........................................................................................................................ 4-19
Software Stack Pointer and Frame Pointer .................................................................................................... 4-20
Conditional Branch Instructions ..................................................................................................................... 4-25
Z Status Bit ..................................................................................................................................................... 4-26
Assigned Working Register Usage ................................................................................................................. 4-27
DSP Data Formats ......................................................................................................................................... 4-30
Accumulator Usage ........................................................................................................................................ 4-32
Accumulator Access ....................................................................................................................................... 4-33
DSP MAC Instructions ................................................................................................................................... 4-33
DSP Accumulator Instructions ....................................................................................................................... 4-37
Scaling Data with the FBCL Instruction .......................................................................................................... 4-37
Normalizing the Accumulator with the FBCL Instruction ................................................................................ 4-39
SECTION 5. INSTRUCTION DESCRIPTIONS
5-1
Instruction Symbols .......................................................................................................................................... 5-2
Instruction Encoding Field Descriptors Introduction ......................................................................................... 5-2
Instruction Description Example ....................................................................................................................... 5-6
Instruction Descriptions .................................................................................................................................... 5-7
SECTION 6. REFERENCE
6-1
Data Memory Map ............................................................................................................................................ 6-2
Core Special Function Register Map ................................................................................................................ 6-4
Program Memory Map ..................................................................................................................................... 6-7
Instruction Bit Map ........................................................................................................................................... 6-9
Instruction Set Summary Table ...................................................................................................................... 6-11
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page iii
dsPIC30F/33F Programmer’s Reference Manual
NOTES:
DS70157B - page iv
Preliminary
© 2005 Microchip Technology Inc.
1
Introduction
Section 1. Introduction
HIGHLIGHTS
This section of the manual contains the following topics:
1.1
1.2
1.3
1.4
1.5
1.6
Introduction .................................................................................................................... 1-2
Manual Objective ........................................................................................................... 1-2
Development Support .................................................................................................... 1-2
Style and Symbol Conventions ...................................................................................... 1-3
Instruction Set Symbols ................................................................................................. 1-4
Related Documents ....................................................................................................... 1-5
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 1-1
dsPIC30F/33F Programmer’s Reference Manual
1.1
Introduction
Microchip Technology’s focus is on products that meet the needs of the embedded control
market. We are a leading supplier of:
•
•
•
•
•
8-bit general purpose microcontrollers (PICmicro® MCUs)
dsPIC30F and dsPIC33F 16-bit Digital Signal Controllers (dsPIC® DSCs)
Speciality and standard nonvolatile memory devices
Security devices (KEELOQ® Security ICs)
Application-specific standard products
Please request a Microchip Product Selector Guide for a listing of all the interesting products that
we have to offer. This literature can be obtained from your local sales office or downloaded from
the Microchip web site (www.microchip.com).
1.2
Manual Objective
PICmicro MCU, dsPIC30F and dsPIC33F devices are grouped by the size of their Instruction
Word and Data Path. The current device families are:
1.
2.
3.
4.
5.
Base-Line:
Mid-Range:
High-End:
Enhanced:
dsPIC30F/33F:
12-bit Instruction Word length, 8-bit Data Path
14-bit Instruction Word length, 8-bit Data Path
16-bit Instruction Word length, 8-bit Data Path
16-bit Instruction Word length, 8-bit Data Path
24-bit Instruction Word length, 16-bit Data Path
This manual is a software developer’s reference for the dsPIC30F and dsPIC33F DSC device
families. This manual describes the Instruction Set in detail and also provides general information
to assist the user in developing software for the dsPIC30F and dsPIC33F families.
This manual does not include detailed information about the core, peripherals, system integration
or device-specific information. The user should refer to the dsPIC30F Family Reference Manual
(DS70046) for information about the core, peripherals and system integration. For device-specific information, the user should refer to the individual data sheets. The information that can be
found in the data sheets includes:
•
•
•
•
Device memory map
Device pinout and packaging details
Device electrical specifications
List of peripherals included on the device
Code examples are given throughout this manual. These examples are valid for any device in
the dsPIC30F or dsPIC33F family.
1.3
Development Support
Microchip offers a wide range of development tools that allow users to efficiently develop and
debug application code. Microchip’s development tools can be broken down into four categories:
1.
2.
3.
4.
Code generation
Hardware/Software debug
Device programmer
Product evaluation boards
Information about the latest tools, product briefs and user guides can be obtained from the
Microchip web site (www.microchip.com) or from your local Microchip Sales Office.
Microchip offers other reference tools to speed the development cycle. These include:
•
•
•
•
•
Application Notes
Reference Designs
Microchip web site
Local Sales Offices with Field Application Support
Corporate Support Line
The Microchip web site lists other sites that may be useful references.
DS70157B-page 1-2
Preliminary
© 2005 Microchip Technology Inc.
Section 1. Introduction
1
1.4
Style and Symbol Conventions
Table 1-1:
Document Conventions
Symbol or Term
Description
set
clear
Reset
To force a bit/register to a value of logic ‘1’.
To force a bit/register to a value of logic ‘0’.
1) To force a register/bit to its default state.
2) A condition in which the device places itself after a device Reset
occurs. Some bits will be forced to ‘0’ (such as interrupt enable bits),
while others will be forced to ‘1’ (such as the I/O data direction bits).
0xnnnn
Designates the number ‘nnnn’ in the hexadecimal number system.
These conventions are used in the code examples. For example, 0x013F
or 0xA800.
: (colon)
Used to specify a range or the concatenation of registers/bits/pins.
One example is ACCAU:ACCAH:ACCAL, which is the concatenation of
three registers to form the 40-bit Accumulator.
Concatenation order (left-right) usually specifies a positional relationship
(MSb to LSb, higher to lower).
<>
Specifies bit(s) locations in a particular register.
One example is SR<IPL2:IPL0> (or IPL<2:0>), which specifies the
register and associated bits or bit positions.
LSb, MSb
Indicates the Least Significant or Most Significant bit in a field.
LSB, MSB, lsw,
Indicates the Least/Most Significant Byte or least/most significant word in
msw
a field of bits.
Courier Font
Used for code examples, binary numbers and for Instruction Mnemonics
in the text.
Times Font
Used for equations and variables.
Times, Bold Font, Used in explanatory text for items called out from a
Italics
graphic/equation/example.
Note:
A Note presents information that we wish to re-emphasize, either to help
you avoid a common pitfall, or make you aware of operating differences
between some device family members. In most instances, a Note is used
in a shaded box (as illustrated below), however, when referenced to a
table, a Note will stand-alone and immediately follow the associated table
(as illustrated below Table 1-2).
Note: This is a Note in a shaded note box.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 1-3
Introduction
Throughout this document, certain style and font format conventions are used. Most format
conventions imply a distinction should be made for the emphasized text. The MCU industry has
many symbols and non-conventional word definitions/abbreviations. Table 1-1 provides a
description for many of the conventions contained in this document.
dsPIC30F/33F Programmer’s Reference Manual
1.5
Instruction Set Symbols
The Summary Tables in Section 3.2 and Section 6.5, and the instruction descriptions in
Section 5.4 utilize the symbols shown in Table 1-2.
Table 1-2:
Symbols Used in Instruction Summary Tables and Descriptions
Symbol
{}
Optional field or operation
[text]
The location addressed by text
(text)
The contents of text
#text
The literal defined by text
a ∈ [b, c, d]
“a” must be in the set of [b, c, d]
<n:m>
Register bit field
{label:}
Optional label name
Acc
Accumulator A or Accumulator B
AWB
Accumulator Write Back
bit4
4-bit wide bit position (0:7 in Byte mode, 0:15 in Word mode)
Expr
Absolute address, label or expression (resolved by the linker)
f
File register address
lit1
1-bit literal (0:1)
lit4
4-bit literal (0:15)
lit5
5-bit literal (0:31)
lit8
8-bit literal (0:255)
lit10
10-bit literal (0:255 in Byte mode, 0:1023 in Word mode)
lit14
14-bit literal (0:16383)
lit16
16-bit literal (0:65535)
lit23
23-bit literal (0:8388607)
Slit4
Signed 4-bit literal (-8:7)
Slit6
Signed 6-bit literal (-32:31) (range is limited to -16:16)
Slit10
Signed 10-bit literal (-512:511)
Slit16
Signed 16-bit literal (-32768:32767)
TOS
Top-of-Stack
Wb
Base working register
Wd
Destination working register (direct and indirect addressing)
Wm, Wn
Working register divide pair (dividend, divisor)
Wm * Wm
Working register multiplier pair (same source register)
Wm * Wn
Working register multiplier pair (different source registers)
Wn
Both source and destination working register (direct addressing)
Wnd
Destination working register (direct addressing)
Wns
Source working register (direct addressing)
WREG
Default working register (assigned to W0)
Ws
Source working register (direct and indirect addressing)
Wx
Source Addressing mode and working register for X data bus prefetch
Wxd
Destination working register for X data bus prefetch
Wy
Source Addressing mode and working register for Y data bus prefetch
Wyd
Note:
DS70157B-page 1-4
Description
Destination working register for Y data bus prefetch
The range of each symbol is instruction dependent. Refer to Section 5. “Instruction
Descriptions” for the specific instruction range.
Preliminary
© 2005 Microchip Technology Inc.
Section 1. Introduction
1
1.6
Related Documents
1.6.1
Microchip Documentation
The following dsPIC30F/dsPIC33F documentation is available from Microchip at the time of this
writing. Many of these documents provide application-specific information that gives actual
examples of using, programming and designing with dsPIC30F/dsPIC33F DSCs.
1.6.2
1.
dsPIC30F Family Reference Manual (DS70046)
The dsPIC30F Family Reference Manual provides information about the dsPIC30F architecture, peripherals and system integration features. The details of device operation are
provided in this document, along with numerous code examples. The information contained
in this manual complements the information in the dsPIC33F Data Sheet.
2.
dsPIC30F Family Overview (DS70043) and dsPIC33F Product Overview (DS70155)
These documents provide a summary of the available family variants, including device
pinouts, memory sizes and available peripherals.
3.
dsPIC30F Data Sheet (DS70083) and dsPIC33F Data Sheet (DS70165)
The data sheets contain device-specific information, such as pinout and packaging details,
electrical specifications and memory maps. Please check the Microchip web site
(www.microchip.com) for a list of available device data sheets.
Third Party Documentation
There are several documents available from third party sources around the world. Microchip
does not review these documents for technical accuracy. However, they may be a helpful source
for understanding the operation of Microchip dsPIC30F or dsPIC33F devices. Please refer to the
Microchip web site (www.microchip.com) for third party documentation related to the dsPIC30F
and dsPIC33F families.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 1-5
Introduction
Microchip, as well as other sources, offer additional documentation which can aid in your development with dsPIC30F/dsPIC33F DSCs. These lists contain the most common documentation,
but other documents may also be available. Please check the Microchip web site
(www.microchip.com) for the latest published technical documentation.
dsPIC30F/33F Programmer’s Reference Manual
NOTES:
DS70157B-page 1-6
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
HIGHLIGHTS
This section of the manual contains overview information about the dsPIC30F and dsPIC33F
devices. It contains the following major topics:
dsPIC30F/33F Overview................................................................................................ 2-2
Programmer’s Model...................................................................................................... 2-3
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-1
Programmer’s
Model
2.1
2.2
2
dsPIC30F/33F Programmer’s Reference Manual
2.1
dsPIC30F/33F Overview
The core of dsPIC30F and dsPIC33F devices is a 16-bit (data) modified Harvard architecture
with an enhanced instruction set, including support for DSP. The core has a 24-bit instruction
word, with a variable length opcode field. The Program Counter (PC) is 23 bits wide and
addresses up to 4M x 24 bits of user program memory space. A single-cycle instruction prefetch
mechanism is used to help maintain throughput and provides predictable execution. The majority
of instructions execute in a single cycle, and overhead free program loop constructs are
supported using the DO and REPEAT instructions, both of which are interruptible.
The dsPIC30F and dsPIC33F have sixteen, 16-bit working registers. Each of the working registers can act as a data, address or offset register. The 16th working register (W15) operates as a
software Stack Pointer for interrupts and calls.
The instruction set is identical for the dsPIC30F and dsPIC33F architectures. There are two
classes of instructions: the MCU class of instructions and the DSP class of instructions. These
two instruction classes are seamlessly integrated into the architecture and execute from a single
execution unit. The instruction set includes many Addressing modes and was designed for
optimum C compiler efficiency.
The data space can be addressed as 32K words or 64 Kbytes and is split into two blocks, referred
to as X and Y data memory. Each memory block has its own independent Address Generation
Unit (AGU). The MCU class of instructions operate solely through the X memory AGU, which
accesses the entire memory map as one linear data space. The DSP dual source class of instructions operates through the X and Y AGUs, which splits the data address space into two parts.
The X and Y data space boundary is arbitrary and device-specific.
The upper 32 Kbytes of the data space memory map can optionally be mapped into program
space at any 16K program word boundary, defined by the 8-bit Program Space Visibility Page
(PSVPAG) register. The program to data space mapping feature lets any instruction access
program space as if it were the data space, which is useful for storing data coefficients.
Overhead free circular buffers (modulo addressing) are supported in both X and Y address
spaces. The modulo addressing removes the software boundary checking overhead for DSP
algorithms. Furthermore, the X AGU circular addressing can be used with any of the MCU class
of instructions. The X AGU also supports bit-reverse addressing, to greatly simplify input or
output data reordering for radix-2 FFT algorithms.
The core supports Inherent (no operand), Relative, Literal, Memory Direct, Register Direct,
Register Indirect and Register Offset Addressing modes. Each instruction is associated with a
predefined Addressing mode group, depending upon its functional requirements. As many as 7
Addressing modes are supported for each instruction.
For most instructions, the dsPIC30F/33F is capable of executing a data (or program data) memory read, a working register (data) read, a data memory write and a program (instruction) memory
read per instruction cycle. As a result, 3-operand instructions can be supported, allowing
A + B = C operations to be executed in a single cycle.
The DSP engine features a high-speed, 17-bit by 17-bit multiplier, a 40-bit ALU, two 40-bit
saturating accumulators and a 40-bit bidirectional barrel shifter. The barrel shifter is capable of
shifting a 40-bit value, up to 16 bits right, or up to 16 bits left, in a single cycle. The DSP
instructions operate seamlessly with all other instructions and have been designed for optimal
real-time performance. The MAC instruction and other associated instructions can concurrently
fetch two data operands from memory while multiplying two working registers. This requires that
the data space be split for these instructions and linear for all others. This is achieved in a
transparent and flexible manner through dedicating certain working registers to each address
space.
The dsPIC30F has a vectored exception scheme with support for up to 8 sources of
non-maskable traps and up to 54 interrupt sources. The dsPIC33F has a similar exception
scheme, but supports up to 118 interrupt sources. In both families, each interrupt source can be
assigned to one of seven priority levels.
DS70157B-page 2-2
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
2.2
Programmer’s Model
The programmer’s model diagram for the dsPIC30F and dsPIC33F is shown in Figure 2-1.
All registers in the programmer’s model are memory mapped and can be manipulated directly by
the instruction set. A description of each register is provided in Table 2-1.
Table 2-1:
Programmer’s Model Register Descriptions
Register
ACCA, ACCB
40-bit DSP Accumulators
CORCON
CPU Core Configuration register
DCOUNT
DO Loop Count register
DOEND
DO Loop End Address register
DOSTART
DO Loop Start Address register
PC
23-bit Program Counter
PSVPAG
Program Space Visibility Page Address register
RCOUNT
Repeat Loop Count register
SPLIM
Stack Pointer Limit Value register
SR
ALU and DSP Engine STATUS register
TBLPAG
Table Memory Page Address register
W0-W15
Working register array
2
Programmer’s
Model
2.2.1
Description
Working Register Array
The 16 working (W) registers can function as data, address or offset registers. The function of a
W register is determined by the instruction that accesses it.
Byte instructions, which target the working register array, only affect the Least Significant Byte
(LSB) of the target register. Since the working registers are memory mapped, the Least and Most
Significant Bytes can be manipulated through byte-wide data memory space accesses.
2.2.2
Default Working Register (WREG)
The instruction set can be divided into two instruction types: working register instructions and file
register instructions. The working register instructions use the working register array as data
values, or as addresses that point to a memory location. In contrast, file register instructions
operate on a specific memory address contained in the instruction opcode.
File register instructions that also utilize a working register do not specify the working register that
is to be used for the instruction. Instead, a default working register (WREG) is used for these file
register instructions. Working register, W0, is assigned to be the WREG. The WREG assignment
is not programmable.
2.2.3
Software Stack Frame Pointer
A frame is a user-defined section of memory in the stack, used by a function to allocate memory
for local variables. W14 has been assigned for use as a Stack Frame Pointer with the link (LNK)
and unlink (ULNK) instructions. However, if a Stack Frame Pointer and the LNK and ULNK
instructions are not used, W14 can be used by any instruction in the same manner as all other
W registers. See Section 4.7.3 “Software Stack Frame Pointer” for detailed information about
the Frame Pointer.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-3
dsPIC30F/33F Programmer’s Reference Manual
Figure 2-1:
Programmer’s Model Diagram
15
0
W0/WREG
DIV and MUL
Result Registers
PUSH.S Shadow
W1
DO Shadow
W2
W3
Legend
W4
MAC Operand
Registers
W5
W6
W7
Working Registers
W8
W9
MAC Address
Registers
W10
W11
W12/MAC Offset
W13/MAC Write Back
W14/Frame Pointer
W15*/Stack Pointer
* W15 & SPLIM not shadowed
SPLIM*
39
Stack Pointer Limit Register
15
31
0
ACCA
DSP
Accumulators
ACCB
22
0
Program Counter
0
7
TABPAG
TBLPAG
7
Data Table Page Address
0
PSVPAG
Program Space Visibility Page Address
15
0
RCOUNT
REPEAT Loop Counter
15
0
DCOUNT
DO Loop Counter
22
0
DOSTART
DO Loop Start Address
22
0
DO Loop End Address
DOEND
15
0
CPU Core Control Register
CORCON
OA
OB
SA
SB OAB SAB DA
SRH
DS70157B-page 2-4
DC IPL2 IPL1 IPL0 RA
N
OV
Z
C
Status Register
SRL
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
2.2.4
Software Stack Pointer
W15 serves as a dedicated Software Stack Pointer, and will be automatically modified by function
calls, exception processing and returns. However, W15 can be referenced by any instruction in
the same manner as all other W registers. This simplifies reading, writing and manipulating the
Stack Pointer. Refer to Section 4.7.1 “Software Stack Pointer” for detailed information about
the Stack Pointer.
2.2.5
Stack Pointer Limit Register (SPLIM)
The SPLIM is a 16-bit register associated with the Stack Pointer. It is used to prevent the Stack
Pointer from overflowing and accessing memory beyond the user allocated region of stack
memory. Refer to Section 4.7.5 “Stack Pointer Overflow” for detailed information about the
SPLIM.
Accumulator A, Accumulator B
Accumulator A (ACCA) and Accumulator B (ACCB) are 40-bit wide registers, utilized by DSP
instructions to perform mathematical and shifting operations. Each accumulator is composed of
3 memory mapped registers:
• AccxU (bits 39-32)
• AccxH (bits 31-16)
• AccxL (bits 15-0)
Refer to Section 4.12 “Accumulator Usage” for details on using ACCA and ACCB.
2.2.7
Program Counter
The Program Counter (PC) is 23 bits wide. Instructions are addressed in the 4M x 24-bit user
program memory space by PC<22:1>, where PC<0> is always set to ‘0’ to maintain instruction
word alignment and provide compatibility with data space addressing. This means that during
normal instruction execution, the PC increments by 2.
Program memory located at 0x80000000 and above is utilized for device configuration data, Unit
ID and Device ID. This region is not available for user code execution and the PC can not access
this area. However, one may access this region of memory using table instructions. Refer to the
dsPIC30F Family Reference Manual (DS70046) for details on accessing the configuration data,
Unit ID and Device ID.
2.2.8
TBLPAG Register
The TBLPAG register is used to hold the upper 8 bits of a program memory address during table
read and write operations. Table instructions are used to transfer data between program memory
space and data memory space. Refer to the dsPIC30F Family Reference Manual (DS70046) for
details on accessing program memory with the table instructions.
2.2.9
PSVPAG Register
Program space visibility allows the user to map a 32-Kbyte section of the program memory space
into the upper 32 Kbytes of data address space. This feature allows transparent access of
constant data through instructions that operate on data memory. The PSVPAG register selects
the 32-Kbyte region of program memory space that is mapped to the data address space. Refer
to the dsPIC30F Family Reference Manual (DS70046) for details on program space visibility.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-5
Programmer’s
Model
2.2.6
2
dsPIC30F/33F Programmer’s Reference Manual
2.2.10
RCOUNT Register
The 14-bit RCOUNT register contains the loop counter for the REPEAT instruction. When a
REPEAT instruction is executed, RCOUNT is loaded with the repeat count of the instruction,
either “lit14” for the “REPEAT #lit14” instruction, or the contents of Wn for the “REPEAT Wn”
instruction. The REPEAT loop will be executed RCOUNT + 1 time.
Note 1: If a REPEAT loop is executing and gets interrupted, RCOUNT may be cleared by
the Interrupt Service Routine to break out of the REPEAT loop when the foreground
code is re-entered.
2: Refer to the dsPIC30F Family Reference Manual (DS70046) for complete details
about REPEAT loops.
2.2.11
DCOUNT Register
The 14-bit DCOUNT register contains the loop counter for hardware DO loops. When a DO
instruction is executed, DCOUNT is loaded with the loop count of the instruction, either “lit14” for
the “DO #lit14,Expr” instruction, or the 14 Least Significant bits of Ws for the “DO Ws,Expr”
instruction. The DO loop will be executed DCOUNT + 1 time.
Note 1: DCOUNT contains a shadow register. See Section 2.2.16 “Shadow Registers”
for information on shadowing.
2: Refer to the dsPIC30F Family Reference Manual (DS70046) for complete details
about DO loops.
2.2.12
DOSTART Register
The DOSTART register contains the starting address for a hardware DO loop. When a DO
instruction is executed, DOSTART is loaded with the address of the instruction following the DO
instruction. This location in memory is the start of the DO loop. When looping is activated,
program execution continues with the instruction stored at the DOSTART address after the last
instruction in the DO loop is executed. This mechanism allows for zero overhead looping.
Note 1: DOSTART has a shadow register. See Section 2.2.16 “Shadow Registers” for
information on shadowing.
2: Refer to the dsPIC30F Family Reference Manual (DS70046) for complete details
about DO loops.
2.2.13
DOEND Register
The DOEND register contains the ending address for a hardware DO loop. When a DO
instruction is executed, DOEND is loaded with the address specified by the expression in the DO
instruction. This location in memory specifies the last instruction in the DO loop. When looping is
activated and the instruction stored at the DOEND address is executed, program execution will
continue from the DO loop start address (stored in the DOSTART register).
Note 1: DOEND has a shadow register. See Section 2.2.16 “Shadow Registers” for
information on shadowing.
2: Refer to the dsPIC30F Family Reference Manual (DS70046) for complete details
about DO loops.
DS70157B-page 2-6
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
2.2.14
STATUS Register
The 16-bit STATUS register, shown in Register 2-1, maintains status information for instructions
which have most recently been executed. Operation Status bits exist for MCU operations, loop
operations and DSP operations. Additionally, the STATUS register contains the CPU Interrupt
Priority Level bits, IPL<2:0>, which are used for interrupt processing.
2.2.14.1
MCU ALU Status Bits
The MCU operation Status bits are either affected or used by the majority of instructions in the
instruction set. Most of the logic, math, rotate/shift and bit instructions modify the MCU Status bits
after execution, and the conditional Branch instructions use the state of individual Status bits to
determine the flow of program execution. All conditional branch instructions are listed in
Section 4.8 “Conditional Branch Instructions”.
The Z status bit is a special zero status bit that is useful for extended precision arithmetic. The Z
bit functions like a normal Z flag for all instructions except those that use a carry or borrow input
(ADDC, CPB, SUBB and SUBBR). See Section 4.9 “Z Status Bit” for usage of the Z status bit.
Note 1: All MCU bits are shadowed during execution of the PUSH.S instruction and they are
restored on execution of the POP.S instruction.
2: All MCU bits, except the DC flag (which is not in the SRL), are stacked during
exception processing (see Section 4.7.1 “Software Stack Pointer”).
2.2.14.2
Loop Status Bits
The DO Active and REPEAT Active (DA, RA) bits are used to indicate when looping is active.
The DO instructions affect the DA flag, which indicates that a DO loop is active. The DA flag is
set to ‘1’ when the first instruction of the DO loop is executed, and it is cleared when the last
instruction of the loop completes final execution. Likewise, the RA flag indicates that a REPEAT
instruction is being executed, and it is only affected by the REPEAT instructions. The RA flag is
set to ‘1’ when the instruction being repeated begins execution, and it is cleared when the
instruction being repeated completes execution for the last time.
The DA flag is read-only. This means that looping may not be initiated by writing a ‘1’ to DA, nor
looping may be terminated by writing a ‘0’ to DA. If a DO loop must be terminated prematurely,
the EDT bit, CORCON<11>, should be used.
Since the RA flag is also read-only, it may not be directly cleared. However, if a REPEAT or its
target instruction is interrupted, the Interrupt Service Routine may clear the RA flag of the SRL,
which resides on the stack. This action will disable looping once program execution returns from
the Interrupt Service Routine, because the restored RA will be ‘0’.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-7
Programmer’s
Model
The Carry, Zero, Overflow, Negative and Digit Carry (C, Z, OV, N and DC) bits are used to show
the immediate status of the MCU ALU. They indicate when an operation has resulted in a Carry,
Zero, Overflow, Negative result and Digit Carry, respectively. When a subtract operation is
performed, the C flag is used as a Borrow flag.
2
dsPIC30F/33F Programmer’s Reference Manual
2.2.14.3
DSP ALU Status Bits
The high byte of the STATUS Register (SRH) is used by the DSP class of instructions, and it is
modified when data passes through one of the adders. The SRH provides status information
about overflow and saturation for both accumulators. The Saturate A, Saturate B, Overflow A and
Overflow B (SA, SB, OA, OB) bits provide individual accumulator status, while the Saturate AB
and Overflow AB (SAB, OAB) bits provide combined accumulator status. The SAB and OAB bits
provide the software developer efficiency in checking the register for saturation or overflow.
The OA and OB bits are used to indicate when an operation has generated an overflow into the
guard bits (bits 32 through 39) of the respective accumulator. This condition can only occur when
the processor is in Super Saturation mode, or if saturation is disabled. It indicates that the
operation has generated a number which cannot be represented with the lower 31 bits of the
accumulator.
The SA and SB bits are used to indicate when an operation has generated an overflow out of the
Most Significant bit of the respective accumulator. The SA and SB bits are active, regardless of
the Saturation mode (Disabled, Normal or Super) and may be considered “sticky”. Namely, once
the SA or SB is set to ‘1’, it can only be cleared manually by software, regardless of subsequent
DSP operations. When required, it is recommended that the bits be cleared with the BCLR
instruction.
For convenience, the OA and OB bits are logically ORed together to form the OAB flag, and the
SA and SB bits are logically ORed to form the SAB flag. These cumulative status bits provide
efficient overflow and saturation checking when an algorithm is implemented, which utilizes both
accumulators. Instead of interrogating the OA and the OB bits independently for arithmetic
overflows, a single check of OAB may be performed. Likewise, when checking for saturation,
SAB may be examined instead of checking both the SA and SB bits. Note that clearing the SAB
flag will clear both the SA and SB bits.
2.2.14.4
Interrupt Priority Level Status Bits
The three Interrupt Priority Level (IPL) bits of the SRL, SR<7:5>, and the IPL3 bit, CORCON<3>,
set the CPU’s IPL which is used for exception processing. Exceptions consist of interrupts and
hardware traps. Interrupts have a user-defined priority level between 0 and 7, while traps have a
fixed priority level between 8 and 15. The fourth Interrupt Priority Level bit, IPL3, is a special IPL
bit that may only be read or cleared by the user. This bit is only set when a hardware trap is
activated and it is cleared after the trap is serviced.
The CPU’s IPL identifies the lowest level exception which may interrupt the processor. The
interrupt level of a pending exception must always be greater than the CPU’s IPL for the CPU to
process the exception. This means that if the IPL is 0, all exceptions at priority Level 1 and above
may interrupt the processor. If the IPL is 7, only hardware traps may interrupt the processor.
When an exception is serviced, the IPL is automatically set to the priority level of the exception
being serviced, which will disable all exceptions of equal and lower priority. However, since the
IPL field is read/write, one may modify the lower three bits of the IPL in an Interrupt Service
Routine to control which exceptions may preempt the exception processing. Since the SRL is
stacked during exception processing, the original IPL is always restored after the exception is
serviced. If required, one may also prevent exceptions from nesting by setting the NSTDIS bit,
INTCON1<15>.
Note:
DS70157B-page 2-8
Refer to the dsPIC30F Family Reference Manual (DS70046) for complete details on
exception processing.
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
2.2.15
Core Control Register
The 16-bit CPU Core Control Register (CORCON), shown in Register 2-2, is used to set the
configuration of the CPU. This register provides the ability to:
•
•
•
•
•
•
map program space into data space
set the ACCA and ACCB saturation enable
set the Data Space Write Saturation mode
set the Accumulator Saturation and Rounding modes
set the Multiplier mode for DSP operations
terminate DO loops prematurely
2
On device Reset, the CORCON is set to 0x0020, which sets the following mode:
Program Space not Mapped to Data Space (PSV = 0)
ACCA and ACCB Saturation Disabled (SATA = 0, SATB = 0)
Data Space Write Saturation Enabled (SATDW = 1)
Accumulator Saturation mode set to normal (ACCSAT = 0)
Accumulator Rounding mode set to unbiased (RND = 0)
DSP Multiplier mode set to signed fractional (US = 0, IF = 0)
In addition to setting CPU modes, the CORCON contains status information about the DO loop
nesting level (DL<2:0>) and the IPL<3> status bit, which indicates if a trap exception is being
processed.
2.2.16
Shadow Registers
A shadow register is used as a temporary holding register and can transfer its contents to or from
the associated host register upon some event. Some of the registers in the programmer’s model
have a shadow register, which is utilized during the execution of a DO, POP.S or PUSH.S
instruction. Shadow register usage is shown in Table 2-2.
Table 2-2:
Automatic Shadow Register Usage
Location
DO
POP.S/PUSH.S
DCOUNT
Yes
—
DOSTART
Yes
—
DOEND
Yes
—
STATUS Register –
DC, N, OV, Z and C bits
—
Yes
W0-W3
—
Yes
Since the DCOUNT, DOSTART and DOEND registers are shadowed, the ability to nest DO loops
without additional overhead is provided. Since all shadow registers are one register deep, up to
one level of DO loop nesting is possible. Further nesting of DO loops is possible in software, with
support provided by the DO Loop Nesting Level Status bits in the CORCON, CORCON<10:8>.
Note:
© 2005 Microchip Technology Inc.
All shadow registers are one register deep and are not directly accessible.
Additional shadowing may be performed in software using the software stack.
Preliminary
DS70157B-page 2-9
Programmer’s
Model
•
•
•
•
•
•
dsPIC30F/33F Programmer’s Reference Manual
Register 2-1:
SR, STATUS Register
High Byte (SRH):
R-0
R-0
OA
OB
bit 15
R/C-0
SA
R/C-0
SB
Low Byte (SRL):
R/W-0
R/W-0
IPL<2:0>
bit 7
R-0
OAB
R/W-0
R/C-0
SAB
R-0
RA
R-0
DA
R/W-0
N
R/W-0
DC
bit 8
R/W-0
OV
R/W-0
Z
bit 15
OA: Accumulator A Overflow bit
1 = Accumulator A overflowed
0 = Accumulator A has not overflowed
bit 14
OB: Accumulator B Overflow bit
1 = Accumulator B overflowed
0 = Accumulator B has not overflowed
bit 13
SA: Accumulator A Saturation bit(1, 2)
1 = Accumulator A is saturated or has been saturated at some time
0 = Accumulator A is not saturated
bit 12
SB: Accumulator B Saturation bit(1, 2)
1 = Accumulator B is saturated or has been saturated at some time
0 = Accumulator B is not saturated
bit 11
OAB: OA || OB Combined Accumulator Overflow bit
1 = Accumulators A or B have overflowed
0 = Neither Accumulators A or B have overflowed
bit 10
SAB: SA || SB Combined Accumulator bit(1, 2, 3)
1 = Accumulators A or B are saturated or have been saturated at some time in the past
0 = Neither Accumulators A or B are saturated
bit 9
DA: DO Loop Active bit(4)
1 = DO loop in progress
0 = DO loop not in progress
bit 8
DC: MCU ALU Half Carry bit
1 = A carry-out from the Most Significant bit of the lower nibble occurred
0 = No carry-out from the Most Significant bit of the lower nibble occurred
bit 7-5
IPL<2:0>: Interrupt Priority Level bits(5)
111 = CPU Interrupt Priority Level is 7 (15). User interrupts disabled
110 = CPU Interrupt Priority Level is 6 (14)
101 = CPU Interrupt Priority Level is 5 (13)
100 = CPU Interrupt Priority Level is 4 (12)
011 = CPU Interrupt Priority Level is 3 (11)
010 = CPU Interrupt Priority Level is 2 (10)
001 = CPU Interrupt Priority Level is 1 (9)
000 = CPU Interrupt Priority Level is 0 (8)
bit 4
RA: REPEAT Loop Active bit
1 = REPEAT loop in progress
0 = REPEAT loop not in progress
bit 3
N: MCU ALU Negative bit
1 = The result of the operation was negative
0 = The result of the operation was not negative
bit 2
OV: MCU ALU Overflow bit
1 = Overflow occurred
0 = No overflow occurred
DS70157B-page 2-10
Preliminary
R/W-0
C
bit 0
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
Register 2-1:
SR, STATUS Register (Continued)
bit 1
Z: MCU ALU Zero bit(6)
1 = The result of the operation was zero
0 = The result of the operation was not zero
bit 0
C: MCU ALU Carry/Borrow bit
1 = A carry-out from the Most Significant bit occurred
0 = No carry-out from the Most Significant bit occurred
Note 1:
2:
3:
4:
5:
Legend:
R = Readable bit
W = Writable bit
C = Clearable bit
-n = Value at POR
‘1’ = bit is set
‘0’ = bit is cleared
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-11
2
Programmer’s
Model
This bit may be read or cleared, but not set.
Once this bit is set, it must be cleared manually by software.
Clearing this bit will clear SA and SB.
This bit is read only.
The IPL<2:0> bits are concatenated with the IPL<3> bit (CORCON<3>) to form the CPU
Interrupt Priority Level. The value in parentheses indicates the IPL, if IPL<3> = 1.
6: Refer to Section 4.9 “Z Status Bit” for operation with ADDC, CPB, SUBB and SUBBR
instructions.
dsPIC30F/33F Programmer’s Reference Manual
Register 2-2:
High Byte:
U
—
bit 15
CORCON, Core Control Register
U
—
U
—
R/W-0
US
R(0)/W-0
EDT
R-0
R-0
DL<2:0>
R/W-0
bit 8
Low Byte:
R/W-0
SATA
bit 7
R/W-0
SATB
R/W-1
SATDW
R/W-0
ACCSAT
R/C-0
IPL3
R/W-0
PSV
R/W-0
RND
R/W-0
IF
bit 0
bit 15-13 Unused
bit 12
US: Unsigned or Signed Multiplier Mode Select bit
1 = Unsigned mode enabled for DSP multiply operations
0 = Signed mode enabled for DSP multiply operations
bit 11
EDT: Early DO Loop Termination Control bit(1)
1 = Terminate executing DO loop at end of current iteration
0 = No effect
bit 10-8
DL<2:0>: DO Loop Nesting Level Status bits(2, 3)
111 = DO looping is nested at 7 levels
110 = DO looping is nested at 6 levels
110 = DO looping is nested at 5 levels
110 = DO looping is nested at 4 levels
011 = DO looping is nested at 3 levels
010 = DO looping is nested at 2 levels
001 = DO looping is active, but not nested (just 1 level)
000 = DO looping is not active
bit 7
SATA: ACCA Saturation Enable bit
1 = Accumulator A saturation enabled
0 = Accumulator A saturation disabled
bit 6
SATB: ACCB Saturation Enable bit
1 = Accumulator B saturation enabled
0 = Accumulator B saturation disabled
bit 5
SATDW: Data Space Write from DSP Engine Saturation Enable bit
1 = Data space write saturation enabled
0 = Data space write saturation disabled
bit 4
ACCSAT: Accumulator Saturation Mode Select bit
1 = 9.31 saturation (Super Saturation)
0 = 1.31 saturation (Normal Saturation)
bit 3
IPL3: Interrupt Priority Level 3 Status bit(4, 5)
1 = CPU Interrupt Priority Level is 8 or greater (trap exception activated)
0 = CPU Interrupt Priority Level is 7 or less (no trap exception activated)
bit 2
PSV: Program Space Visibility in Data Space Enable bit
1 = Program space visible in data space
0 = Program space not visible in data space
DS70157B-page 2-12
Preliminary
© 2005 Microchip Technology Inc.
Section 2. Programmer’s Model
Register 2-2:
CORCON, Core Control Register (Continued)
bit 1
RND: Rounding Mode Select bit
1 = Biased (conventional) rounding enabled
0 = Unbiased (convergent) rounding enabled
bit 0
IF: Integer or Fractional Multiplier Mode Select bit
1 = Integer mode enabled for DSP multiply operations
0 = Fractional mode enabled for DSP multiply operations
Note 1:
2:
3:
4:
5:
This bit will always read ‘0’.
DL<2:1> are read only.
The first two levels of DO loop nesting are handled by hardware.
This bit may be read or cleared, but not set.
This bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU Interrupt Priority
Level.
R = Readable bit
W = Writable bit
C = Clearable bit
x = bit is unknown
-n = Value at POR
‘1’ = bit is set
‘0’ = bit is cleared
U = Unimplemented bit, read as ‘0’
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 2-13
Programmer’s
Model
Legend:
2
dsPIC30F/33F Programmer’s Reference Manual
NOTES:
DS70157B-page 2-14
Preliminary
© 2005 Microchip Technology Inc.
Section 3. Instruction Set Overview
HIGHLIGHTS
This section of the manual contains the following major topics:
3.1
3.2
3.3
Introduction .................................................................................................................... 3-2
Instruction Set Overview ................................................................................................ 3-2
Instruction Set Summary Tables .................................................................................... 3-3
3
Instruction Set
Overview
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 3-1
dsPIC30F/33F Programmer’s Reference Manual
3.1
Introduction
The dsPIC30F/33F instruction set provides a broad suite of instructions, which supports traditional microcontroller applications and a class of instructions, which supports math intensive
applications. Since almost all of the functionality of the PICmicro MCU instruction set has been
maintained, this hybrid instruction set allows a friendly DSP migration path for users already
familiar with the PICmicro microcontroller.
3.2
Instruction Set Overview
The dsPIC30F/33F instruction set contains 84 instructions, which can be grouped into the ten
functional categories shown in Table 3-1. Table 1-2 defines the symbols used in the instruction
summary tables, Table 3-2 through Table 3-11. These tables define the syntax, description,
storage and execution requirements for each instruction. Storage requirements are represented
in 24-bit instruction words and execution requirements are represented in instruction cycles.
Table 3-1:
dsPIC30F/33F Instruction Groups
Summary Table
Page #
Move Instructions
Functional Group
Table 3-2
3-3
Math Instructions
Table 3-3
3-4
Logic Instructions
Table 3-4
3-5
Rotate/Shift Instructions
Table 3-5
3-6
Bit Instructions
Table 3-6
3-7
Compare/Skip Instructions
Table 3-7
3-8
Program Flow Instructions
Table 3-8
3-9
Shadow/Stack Instructions
Table 3-9
3-10
Control Instructions
Table 3-10
3-10
DSP Instructions
Table 3-11
3-10
Most instructions have several different Addressing modes and execution flows, which require
different instruction variants. For instance, there are six unique ADD instructions and each
instruction variant has its own instruction encoding. Instruction format descriptions and specific
instruction operation are provided in Section 3. “Instruction Set Overview”. Additionally, a
composite alphabetized instruction set table is provided in Section 6. “Reference”.
3.2.1
Multi-Cycle Instructions
As the instruction summary tables show, most instructions execute in a single cycle, with the
following exceptions:
• Instructions DO, MOV.D, POP.D, PUSH.D, TBLRDH, TBLRDL, TBLWTH and
TBLWTL require 2 cycles to execute.
• Instructions DIV.S, DIV.U and DIVF are single-cycle instructions, which should be
executed 18 consecutive times as the target of a REPEAT instruction.
• Instructions that change the program counter also require 2 cycles to execute, with the
extra cycle executed as a NOP. SKIP instruction, which skips over a 2-word instruction,
requires 3 instruction cycles to execute, with 2 cycles executed as a NOP.
• The RETFIE, RETLW and RETURN are a special case of an instruction that changes the
program counter. These execute in 3 cycles, unless an exception is pending and then they
execute in 2 cycles.
Note:
DS70157B-page 3-2
Instructions which access program memory as data, using Program Space Visibility,
will incur a one or two cycle delay. However, when the target instruction of a
REPEAT loop accesses program memory as data, only the first execution of the
target instruction is subject to the delay. See the dsPIC30F Family Reference
Manual (DS70046) for details.
Preliminary
© 2005 Microchip Technology Inc.
Section 3. Instruction Set Overview
3.2.2
Multi-Word Instructions
As defined by Table 3-2: “Move Instructions”, almost all instructions consume one instruction
word (24 bits), with the exception of the CALL, DO and GOTO instructions, which are Program
Flow Instructions, listed in Table 3-8. These instructions require two words of
memory because their opcodes embed large literal operands.
3.3
Instruction Set Summary Tables
Table 3-2:
Move Instructions
Assembly Syntax
EXCH
Description
Wns,Wnd
Swap Wns and Wnd
(see Note)
Words Cycles Page #
1
1
5-115
MOV
f {,WREG}
Move f to destination
1
1
5-145
MOV
WREG,f
Move WREG to f
1
1
5-146
MOV
f,Wnd
Move f to Wnd
1
1
5-147
MOV
Wns,f
Move Wns to f
1
1
5-148
MOV.B
#lit8,Wnd
Move 8-bit literal to Wnd
1
1
5-149
MOV
#lit16,Wnd
Move 16-bit literal to Wnd
1
1
5-150
MOV
[Ws+Slit10],Wnd
Move [Ws + signed 10-bit offset] to Wnd
1
1
5-151
MOV
Wns,[Wd+Slit10]
Move Wns to [Wd + signed 10-bit offset]
1
1
5-152
MOV
Ws,Wd
Move Ws to Wd
1
1
5-153
MOV.D
Ws,Wnd
Move double Ws to Wnd:Wnd + 1
1
2
5-155
Wns,Wd
Move double Wns:Wns + 1 to Wd
1
2
5-157
SWAP
Wn
Wn = byte or nibble swap Wn
1
1
5-249
TBLRDH
Ws,Wd
Read high program word to Wd
1
2
5-250
TBLRDL
Ws,Wd
Read low program word to Wd
1
2
5-252
TBLWTH
Ws,Wd
Write Ws to high program word
1
2
5-254
TBLWTL
Ws,Wd
Write Ws to low program word
1
2
5-256
Note:
© 2005 Microchip Technology Inc.
When the optional {,WREG} operand is specified, the destination of the instruction is
WREG. When {,WREG} is not specified, the destination of the instruction is the file
register f.
Preliminary
DS70157B-page 3-3
3
Instruction Set
Overview
MOV.D
dsPIC30F/33F Programmer’s Reference Manual
Table 3-3:
Math Instructions
Assembly Syntax
Description
Words Cycles Page #
ADD
ADD
ADD
f {,WREG}(1)
#lit10,Wn
Wb,#lit5,Wd
Destination = f + WREG
Wn = lit10 + Wn
Wd = Wb + lit5
1
1
1
1
1
1
5-7
5-8
5-9
ADD
ADDC
ADDC
ADDC
ADDC
DAW.B
DEC
DEC
DEC2
DEC2
DIV.S
DIV.SD
Wb,Ws,Wd
f {,WREG}(1)
#lit10,Wn
Wb,#lit5,Wd
Wb,Ws,Wd
Wn
f {,WREG}(1)
Ws,Wd
f {,WREG}(1)
Ws,Wd
Wm, Wn
Wm, Wn
Wd = Wb + Ws
Destination = f + WREG + (C)
Wn = lit10 + Wn + (C)
Wd = Wb + lit5 + (C)
Wd = Wb + Ws + (C)
Wn = decimal adjust Wn
1
1
1
1
1
1
1
1
1
1
1
1
5-10
5-14
5-15
5-16
5-17
5-95
Destination = f – 1
Wd = Ws – 1
Destination = f – 2
Wd = Ws – 2
Signed 16/16-bit integer divide
Signed 32/16-bit integer divide
1
1
1
1
1
1
1
1
1
1
18(2)
18(2)
5-96
5-97
5-98
5-99
5-101
5-101
DIV.U
DIV.UD
DIVF
INC
INC
INC2
Wm, Wn
Wm, Wn
Wm, Wn
f {,WREG}(1)
Ws,Wd
f {,WREG}(1)
INC2
MUL
MUL.SS
MUL.SU
MUL.SU
MUL.US
MUL.UU
MUL.UU
SE
SUB
SUB
SUB
SUB
SUBB
SUBB
SUBB
SUBB
Ws,Wd
f
Wb,Ws,Wnd
Wb,#lit5,Wnd
Wb,Ws,Wnd
Wb,Ws,Wnd
Wb,#lit5,Wnd
Wb,Ws,Wnd
Ws,Wnd
f {,WREG}(1)
#lit10,Wn
Wb,#lit5,Wd
Wb,Ws,Wd
f {,WREG}(1)
#lit10,Wn
Wb,#lit5,Wd
Wb,Ws,Wd
Unsigned 16/16-bit integer divide
Unsigned 32/16-bit integer divide
Signed 16/16-bit fractional divide
Destination = f + 1
Wd = Ws + 1
Destination = f + 2
Wd = Ws + 2
W3:W2 = f * WREG
{Wnd + 1,Wnd} = sign(Wb) * sign(Ws)
{Wnd + 1,Wnd} = sign(Wb) * unsign(lit5)
{Wnd + 1,Wnd} = sign(Wb) * unsign(Ws)
{Wnd + 1,Wnd} = unsign(Wb) * sign(Ws)
{Wnd + 1,Wnd} = unsign(Wb) * unsign(lit5)
{Wnd + 1,Wnd} = unsign(Wb) * unsign(Ws)
Wnd = sign-extended Ws
Destination = f – WREG
Wn = Wn – lit10
Wd = Wb – lit5
Wd = Wb – Ws
Destination = f – WREG – (C)
Wn = Wn – lit10 – (C)
Wd = Wb – lit5 – (C)
Wd = Wb – Ws – (C)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
18(2)
18(2)
18(2)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5-103
5-103
5-105
5-124
5-125
5-126
5-127
5-169
5-170
5-172
5-174
5-176
5-178
5-179
5-220
5-230
5-231
5-232
5-233
5-236
5-237
5-238
5-239
SUBBR f {,WREG}(1)
Destination = WREG – f – (C)
1
1
5-241
SUBBR Wb,#lit5,Wd
Wd = lit5 – Wb – (C)
1
1
5-242
SUBBR Wb,Ws,Wd
Wd = Ws – Wb – (C)
1
1
5-243
SUBR
f {,WREG}(1)
Destination = WREG – f
1
1
5-245
SUBR
Wb,#lit5,Wd
Wd = lit5 – Wb
1
1
5-246
SUBR
Wb,Ws,Wd
Wd = Ws – Wb
1
1
5-247
ZE
Ws,Wnd
Wnd = zero-extended Ws
1
1
5-264
Note 1: When the optional {,WREG} operand is specified, the destination of the instruction is
WREG. When {,WREG} is not specified, the destination of the instruction is the file
register f.
2: The divide instructions must be preceded with a “REPEAT #17” instruction, such that
they are executed 18 consecutive times.
DS70157B-page 3-4
Preliminary
© 2005 Microchip Technology Inc.
Section 3. Instruction Set Overview
Table 3-4:
Logic Instructions
Assembly Syntax
(see Note)
Description
Destination = f .AND. WREG
Words Cycles Page #
1
1
5-19
AND
f {,WREG}
AND
#lit10,Wn
Wn = lit10 .AND. Wn
1
1
5-20
AND
Wb,#lit5,Wd
Wd = Wb .AND. lit5
1
1
5-21
AND
Wb,Ws,Wd
Wd = Wb .AND. Ws
1
1
5-22
CLR
f
f = 0x0000
1
1
5-75
CLR
WREG
WREG = 0x0000
1
1
5-75
CLR
Wd
Wd = 0x0000
1
1
5-76
COM
f {,WREG}(see Note)
Destination = f
1
1
5-80
COM
Ws,Wd
Wd = Ws
1
1
5-81
(see Note)
f {,WREG}
Destination = f .IOR. WREG
1
1
5-128
#lit10,Wn
Wn = lit10 .IOR. Wn
1
1
5-129
IOR
Wb,#lit5,Wd
Wd = Wb .IOR. lit5
1
1
5-130
IOR
Wb,Ws,Wd
Wd = Wb .IOR. Ws
1
1
5-131
NEG
f {,WREG}(see Note)
Destination = f + 1
1
1
5-181
NEG
Ws,Wd
Wd = Ws + 1
1
1
5-182
SETM
f
f = 0xFFFF
1
1
5-221
SETM
WREG
WREG = 0xFFFF
1
1
5-221
SETM
Wd
Wd = 0xFFFF
1
1
5-222
XOR
f {,WREG}(see Note)
Destination = f .XOR. WREG
1
1
5-259
XOR
#lit10,Wn
Wn = lit10 .XOR. Wn
1
1
5-260
XOR
Wb,#lit5,Wd
Wd = Wb .XOR. lit5
1
1
5-261
XOR
Wb,Ws,Wd
Wd = Wb .XOR. Ws
1
1
5-262
Note:
© 2005 Microchip Technology Inc.
When the optional {,WREG} operand is specified, the destination of the instruction is
WREG. When {,WREG} is not specified, the destination of the instruction is the file
register f.
Preliminary
DS70157B-page 3-5
3
Instruction Set
Overview
IOR
IOR
dsPIC30F/33F Programmer’s Reference Manual
Table 3-5:
Rotate/Shift Instructions
Assembly Syntax
Description
Words Cycles Page #
Destination = arithmetic right shift f
1
1
5-24
ASR
f {,WREG}
ASR
Ws,Wd
Wd = arithmetic right shift Ws
1
1
5-25
ASR
Wb,#lit4,Wnd
Wnd = arithmetic right shift Wb by lit4
1
1
5-27
ASR
Wb,Wns,Wnd
Wnd = arithmetic right shift Wb by Wns
1
1
5-28
(see Note)
LSR
f {,WREG}
Destination = logical right shift f
1
1
5-136
LSR
Ws,Wd
Wd = logical right shift Ws
1
1
5-137
LSR
Wb,#lit4,Wnd
Wnd = logical right shift Wb by lit4
1
1
5-139
LSR
Wb,Wns,Wnd
Wnd = logical right shift Wb by Wns
1
1
5-140
RLC
f {,WREG}(see Note)
Destination = rotate left through Carry f
1
1
5-204
RLC
Ws,Wd
Wd = rotate left through Carry Ws
1
1
5-205
RLNC
f {,WREG}(see Note)
Destination = rotate left (no Carry) f
1
1
5-207
RLNC
Ws,Wd
Wd = rotate left (no Carry) Ws
1
1
5-208
(see Note)
RRC
f {,WREG}
Destination = rotate right through Carry f
1
1
5-210
RRC
Ws,Wd
Wd = rotate right through Carry Ws
1
1
5-211
5-213
(see Note)
RRNC
f {,WREG}
Destination = rotate right (no Carry) f
1
1
RRNC
Ws,Wd
Wd = rotate right (no Carry) Ws
1
1
5-214
SL
f {,WREG}(see Note)
Destination = left shift f
1
1
5-225
SL
Ws,Wd
Wd = left shift Ws
1
1
5-226
SL
Wb,#lit4,Wnd
Wnd = left shift Wb by lit4
1
1
5-228
SL
Wb,Wns,Wnd
Wnd = left shift Wb by Wns
1
1
5-229
Note:
DS70157B-page 3-6
(see Note)
When the optional {,WREG} operand is specified, the destination of the instruction is
WREG. When {,WREG} is not specified, the destination of the instruction is the file
register f.
Preliminary
© 2005 Microchip Technology Inc.
Section 3. Instruction Set Overview
Table 3-6:
Bit Instructions
Assembly Syntax
Description
Words Cycles Page #
BCLR
f,#bit4
Bit clear f
1
1
5-29
BCLR
Ws,#bit4
Bit clear Ws
1
1
5-30
BSET
f,#bit4
Bit set f
1
1
5-54
BSET
Ws,#bit4
Bit set Ws
1
1
5-55
BSW.C
Ws,Wb
Write C bit to Ws<Wb>
1
1
5-56
BSW.Z
Ws,Wb
Write Z bit to Ws<Wb>
1
1
5-56
BTG
f,#bit4
Bit toggle f
1
1
5-58
BTG
Ws,#bit4
Bit toggle Ws
1
1
5-59
BTST
f,#bit4
Bit test f
1
1
5-67
BTST.C
Ws,#bit4
Bit test Ws to C
1
1
5-68
BTST.Z
Ws,#bit4
Bit test Ws to Z
1
1
5-68
BTST.C
Ws,Wb
Bit test Ws<Wb> to C
1
1
5-69
BTST.Z
Ws,Wb
Bit test Ws<Wb> to Z
1
1
5-69
BTSTS
f,#bit4
Bit test f then set f
1
1
5-71
BTSTS.C
Ws,#bit4
Bit test Ws to C then set Ws
1
1
5-72
BTSTS.Z
Ws,#bit4
Bit test Ws to Z then set Ws
1
1
5-72
FBCL
Ws,Wnd
Find bit change from left (MSb) side
1
1
5-116
FF1L
Ws,Wnd
Find first one from left (MSb) side
1
1
5-118
FF1R
Ws,Wnd
Find first one from right (LSb) side
1
1
5-120
3
Instruction Set
Overview
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 3-7
dsPIC30F/33F Programmer’s Reference Manual
Table 3-7:
Compare/Skip Instructions
Assembly Syntax
Words
Cycles(see Note)
Page #
BTSC
f,#bit4
Bit test f, skip if clear
1
1 (2 or 3)
5-60
BTSC
Ws,#bit4
Bit test Ws, skip if clear
1
1 (2 or 3)
5-62
BTSS
f,#bit4
Bit test f, skip if set
1
1 (2 or 3)
5-64
BTSS
Ws,#bit4
Bit test Ws, skip if set
1
1 (2 or 3)
5-65
CP
f
Compare (f – WREG)
1
1
5-82
CP
Wb,#lit5
Compare (Wb – lit5)
1
1
5-83
CP
Wb,Ws
Compare (Wb – Ws)
1
1
5-84
CP0
f
Compare (f – 0x0000)
1
1
5-85
CP0
Ws
Compare (Ws – 0x0000)
1
1
5-86
CPB
f
Compare with Borrow (f – WREG – C)
1
1
5-87
CPB
Wb,#lit5
Compare with Borrow (Wb – lit5 – C)
1
1
5-88
CPB
Wb,Ws
Compare with Borrow (Wb – Ws – C)
1
1
5-89
CPSEQ
Wb, Wn
Compare (Wb – Wn), skip if =
1
1 (2 or 3)
5-91
CPSGT
Wb, Wn
Compare (Wb – Wn), skip if >
1
1 (2 or 3)
5-92
CPSLT
Wb, Wn
Compare (Wb – Wn), skip if <
1
1 (2 or 3)
5-93
CPSNE
Wb, Wn
Compare (Wb – Wn), skip if ≠
1
1 (2 or 3)
5-94
Note:
DS70157B-page 3-8
Description
Conditional skip instructions execute in 1 cycle if the skip is not taken, 2 cycles if the skip
is taken over a one-word instruction and 3 cycles if the skip is taken over a two-word
instruction.
Preliminary
© 2005 Microchip Technology Inc.
Section 3. Instruction Set Overview
Table 3-8:
Program Flow Instructions
Assembly Syntax
Description
Words
Cycles Page #
BRA
Expr
Branch unconditionally
1
2
5-31
BRA
Wn
Computed branch
1
2
5-32
BRA
C,Expr
Branch if Carry (no Borrow)
1
1 (2)(1)
5-33
BRA
GE,Expr
Branch if greater than or equal
1
1 (2)(1)
5-35
BRA
GEU,Expr
Branch if unsigned greater than or equal
1
1 (2)(1)
5-36
(1)
BRA
GT,Expr
Branch if greater than
1
1 (2)
5-37
BRA
GTU,Expr
Branch if unsigned greater than
1
1 (2)(1)
5-38
BRA
LE,Expr
Branch if less than or equal
1
1 (2)(1)
5-39
(1)
BRA
LEU,Expr
Branch if unsigned less than or equal
1
1 (2)
5-40
BRA
LT,Expr
Branch if less than
1
1 (2)(1)
5-41
(1)
BRA
LTU,Expr
Branch if unsigned less than
1
1 (2)
5-42
BRA
N,Expr
Branch if Negative
1
1 (2)(1)
5-43
BRA
NC,Expr
Branch if not Carry (Borrow)
1
1 (2)(1)
5-44
(1)
BRA
NN,Expr
Branch if not Negative
1
1 (2)
5-45
BRA
NOV,Expr
Branch if not Overflow
1
1 (2)(1)
5-46
BRA
NZ,Expr
Branch if not Zero
1
1 (2)(1)
5-47
(1)
BRA
OA,Expr
Branch if Accumulator A Overflow
1
1 (2)
5-48
BRA
OB,Expr
Branch if Accumulator B Overflow
1
1 (2)(1)
5-49
(1)
OV,Expr
Branch if Overflow
1
1 (2)
5-50
BRA
SA,Expr
Branch if Accumulator A Saturate
1
1 (2)(1)
5-51
BRA
SB,Expr
Branch if Accumulator B Saturate
1
1 (2)(1)
5-52
(2)(1)
BRA
Z,Expr
Branch if Zero
1
CALL
Expr
Call subroutine
2
1
2
5-73
5-53
CALL
Wn
Call indirect subroutine
1
2
5-74
DO
#lit14,Expr
Do code through PC + Expr, (lit14 + 1)
times
2
2
5-107
DO
Wn,Expr
Do code through PC+Expr, (Wn + 1) times
2
2
5-109
GOTO
Expr
Go to address
2
2
5-122
GOTO
Wn
Go to address indirectly
1
2
5-123
RCALL
Expr
Relative call
1
2
5-195
RCALL
Wn
Computed call
1
2
5-196
REPEAT
#lit14
Repeat next instruction (lit14 + 1) times
1
1
5-197
REPEAT
Wn
Repeat next instruction (Wn + 1) times
1
1
5-198
Return from interrupt enable
1
3 (2)(2)
5-201
Return with lit10 in Wn
1
(2)
3 (2)
5-202
Return from subroutine
1
3 (2)(2)
5-203
RETFIE
RETLW
RETURN
#lit10,Wn
Note 1: Conditional branch instructions execute in 1 cycle if the branch is not taken, or 2 cycles
if the branch is taken.
2: RETURN instructions execute in 3 cycles, but if an exception is pending, they execute in
2 cycles.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 3-9
3
Instruction Set
Overview
BRA
dsPIC30F/33F Programmer’s Reference Manual
Table 3-9:
Shadow/Stack Instructions
Assembly Syntax
Description
LNK
#lit14
Link Frame Pointer
1
1
5-135
POP
f
POP TOS to f
1
1
5-186
5-187
POP
Wd
POP TOS to Wd
1
1
POP.D
Wnd
Double POP from TOS to Wnd:Wnd + 1
1
2
5-188
POP shadow registers
1
1
5-189
POP.S
PUSH
f
PUSH f to TOS
1
1
5-190
PUSH
Ws
PUSH Ws to TOS
1
1
5-191
PUSH.D
Wns
PUSH double Wns:Wns + 1 to TOS
1
2
5-192
PUSH.S
PUSH shadow registers
1
1
5-193
ULNK
Unlink Frame Pointer
1
1
5-258
Table 3-10:
Control Instructions
Assembly Syntax
CLRWDT
DISI
#lit14
Description
Words Cycles Page #
Clear Watchdog Timer
1
1
5-79
5-100
Disable interrupts for (lit14 + 1) instruction cycles
1
1
NOP
No operation
1
1
5-184
NOPR
No operation
1
1
5-185
Enter Power-saving mode lit1
1
1
5-194
Software device Reset
1
1
5-200
PWRSAV
#lit1
Reset
Table 3-11:
DSP Instructions
Assembly Syntax
Description
Words Cycles Page #
ADD
Acc
Add accumulators
1
1
5-11
ADD
Ws,#Slit4,Acc
16-bit signed add to Acc
1
1
5-12
CLR
Acc,Wx,Wxd,Wy,Wyd,AWB
Clear Acc
1
1
5-77
ED
Wm*Wm,Acc,Wx,Wy,Wxd
Euclidean distance
(no accumulate)
1
1
5-111
EDAC
Wm*Wm,Acc,Wx,Wy,Wxd
Euclidean distance
1
1
5-113
LAC
Ws,#Slit4,Acc
Load Acc
1
1
5-133
MAC
Wm*Wn,Acc,Wx,Wxd,Wy,
Wyd,AWB
Multiply and accumulate
1
1
5-141
MAC
Wm*Wm,Acc,Wx,Wxd,Wy,Wyd Square and accumulate
MOVSAC Acc,Wx,Wxd,Wy,Wyd,AWB
DS70157B-page 3-10
Words Cycles Page #
Move Wx to Wxd and Wy to Wyd
1
1
5-143
1
1
5-159
MPY
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd Multiply Wn by Wm to Acc
1
1
5-161
MPY
Wm*Wm,Acc,Wx,Wxd,Wy,Wyd Square to Acc
1
1
5-163
MPY.N
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd -(Multiply Wn by Wm) to Acc
1
1
5-165
MSC
Wm*Wn,Acc,Wx,Wxd,Wy,
Wyd,AWB
1
1
5-167
Multiply and subtract from Acc
NEG
Acc
Negate Acc
1
1
5-183
SAC
Acc,#Slit4,Wd
Store Acc
1
1
5-216
SAC.R
Acc,#Slit4,Wd
Store rounded Acc
1
1
5-218
SFTAC
Acc,#Slit6
Arithmetic shift Acc by Slit6
1
1
5-223
SFTAC
Acc,Wn
Arithmetic shift Acc by (Wn)
1
1
5-224
SUB
Acc
Subtract accumulators
1
1
5-235
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
HIGHLIGHTS
This section of the manual contains the following major topics:
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
4.17
Data Addressing Modes................................................................................................. 4-2
Program Addressing Modes ........................................................................................ 4-11
Instruction Stalls........................................................................................................... 4-12
Byte Operations ........................................................................................................... 4-13
Word Move Operations ................................................................................................ 4-16
Using 10-bit Literal Operands ...................................................................................... 4-19
Software Stack Pointer and Frame Pointer.................................................................. 4-20
Conditional Branch Instructions ................................................................................... 4-25
Z Status Bit................................................................................................................... 4-26
Assigned Working Register Usage .............................................................................. 4-27
DSP Data Formats ....................................................................................................... 4-30
Accumulator Usage...................................................................................................... 4-32
Accumulator Access .................................................................................................... 4-33
DSP MAC Instructions ................................................................................................. 4-33
DSP Accumulator Instructions ..................................................................................... 4-37
Scaling Data with the FBCL Instruction ....................................................................... 4-37
Normalizing the Accumulator with the FBCL Instruction.............................................. 4-39
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-1
dsPIC30F/33F Programmer’s Reference Manual
4.1
Data Addressing Modes
The dsPIC30F/33F supports three native Addressing modes for accessing data memory, along
with several forms of immediate addressing. Data accesses may be performed using file register,
register direct or register indirect addressing, and immediate addressing allows a fixed value to
be used by the instruction.
File register addressing provides the ability to operate on data stored in the lower 8K of data
memory (Near RAM), and also move data between the working registers and the entire 64K data
space. Register direct addressing is used to access the 16 memory mapped working registers,
W0:W15. Register indirect addressing is used to efficiently operate on data stored in the entire
64K data space, using the contents of the working registers as an effective address. Immediate
addressing does not access data memory, but provides the ability to use a constant value as an
instruction operand. The address range of each mode is summarized in Table 4-1.
Table 4-1:
dsPIC30F/33F Addressing Modes
Addressing Mode
File Register
0x0000-0x1FFF (see Note)
Register Direct
0x0000-0x001F (working register array W0:W15)
Register Indirect
0x0000-0xFFFF
Immediate
N/A (constant value)
Note:
4.1.1
Address Range
The address range for the File Register MOV is 0x0000-0xFFFE.
File Register Addressing
File register addressing is used by instructions which use a predetermined data address as an
operand for the instruction. The majority of instructions that support file register addressing
provide access to the lower 8 Kbytes of data memory, which is called the Near RAM. However,
the MOV instruction provides access to all 64 Kbytes of memory using file register addressing.
This allows one to load data from any location in data memory to any working register, and store
the contents of any working register to any location in data memory. It should be noted that file
register addressing supports both byte and word accesses of data memory, with the exception
of the MOV instruction, which accesses all 64K of memory as words. Examples of file register
addressing are shown in Example 4-1.
Most instructions, which support file register addressing, perform an operation on the specified file
register and the default working register WREG (see Section 2.2.2 “Default Working Register
(WREG)”). If only one operand is supplied in the instruction, WREG is an implied operand and the
operation results are stored back to the file register. In these cases, the instruction is effectively a
read-modify-write instruction. However, when both the file register and WREG are specified in the
instruction, the operation results are stored in WREG and the contents of the file register are
unchanged. Sample instructions which show the interaction between the file register and WREG
are shown in Example 4-2.
Note:
DS70157B-page 4-2
Instructions which support file register addressing use ‘f’ as an operand in the
instruction summary tables of Section 3. “Instruction Set Overview”.
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-1:
DEC
File Register Addressing
0x1000
; decrement data stored at 0x1000
Before Instruction:
Data Memory 0x1000 = 0x5555
After Instruction:
Data Memory 0x1000 = 0x5554
MOV
0x27FE, W0
; move data stored at 0x27FE to W0
Before Instruction:
W0 = 0x5555
Data Memory 0x27FE = 0x1234
After Instruction:
W0 = 0x1234
Data Memory 0x27FE = 0x1234
Example 4-2:
AND
File Register Addressing and WREG
0x1000
; AND 0x1000 with WREG, store to 0x1000
Before Instruction:
W0 (WREG) = 0x332C
Data Memory 0x1000 = 0x5555
After Instruction:
W0 (WREG) = 0x332C
Data Memory 0x1000 = 0x1104
AND
0x1000, WREG
; AND 0x1000 with WREG, store to WREG
Before Instruction:
W0 (WREG) = 0x332C
Data Memory 0x1000 = 0x5555
After Instruction:
W0 (WREG) = 0x1104
Data Memory 0x1000 = 0x5555
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-3
dsPIC30F/33F Programmer’s Reference Manual
4.1.2
Register Direct Addressing
Register direct addressing is used to access the contents of the 16 working registers (W0:W15).
The Register Direct Addressing mode is fully orthogonal, which allows any working register to be
specified for any instruction that uses register direct addressing, and it supports both byte and
word accesses. Instructions which employ register direct addressing use the contents of the
specified working register as data to execute the instruction, so this Addressing mode is useful
only when data already resides in the working register core. Sample instructions which utilize
register direct addressing are shown in Example 4-3.
Another feature of register direct addressing is that it provides the ability for dynamic flow control.
Since variants of the DO and REPEAT instruction support register direct addressing, one may
generate flexible looping constructs using these instructions.
Note:
Instructions which must use register direct addressing, use the symbols Wb, Wn,
Wns and Wnd in the summary tables of Section 3. “Instruction Set Overview”.
Commonly, register direct addressing may also be used when register indirect
addressing may be used. Instructions which use register indirect addressing, use
the symbols Wd and Ws in the summary tables of Section 3. “Instruction Set
Overview”.
Example 4-3:
EXCH
Register Direct Addressing
W2, W3
; Exchange W2 and W3
Before Instruction:
W2 = 0x3499
W3 = 0x003D
After Instruction:
W2 = 0x003D
W3 = 0x3499
IOR
#0x44, W0
; Inclusive-OR 0x44 and W0
Before Instruction:
W0 = 0x9C2E
After Instruction:
W0 = 0x9C6E
SL
W6, W7, W8
; Shift left W6 by W7, and store to W8
Before Instruction:
W6 = 0x000C
W7 = 0x0008
W8 = 0x1234
After Instruction:
W6 = 0x000C
W7 = 0x0008
W8 = 0x0C00
DS70157B-page 4-4
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.1.3
Register Indirect Addressing
Register indirect addressing is used to access any location in data memory by treating the
contents of a working register as an Effective Address (EA) to data memory. Essentially, the
contents of the working register become a pointer to the location in data memory which is to be
accessed by the instruction.
This Addressing mode is powerful, because it also allows one to modify the contents of the
working register, either before or after the data access is made, by incrementing or decrementing
the EA. By modifying the EA in the same cycle that an operation is being performed, register
indirect addressing allows for the efficient processing of data that is stored sequentially in
memory. The modes of indirect addressing supported by the dsPIC30F/dsPIC33F are shown in
Table 4-2.
Table 4-2:
Indirect Addressing Modes
Syntax
Function
(Byte
Instruction)
Function
(Word
Instruction)
No Modification
[Wn]
EA = [Wn]
EA = [Wn]
Pre-Increment
[++Wn]
EA = [Wn + = 1]
Pre-Decrement
[--Wn]
EA = [Wn – = 1]
Post-Increment
[Wn++]
EA = [Wn]+= 1
Post-Decrement
[Wn--]
EA = [Wn] – = 1
Register Offset
[Wn+Wb]
EA = [Wn + Wb]
Indirect Mode
Description
The contents of Wn forms the
EA.
EA = [Wn + = 2] Wn is pre-incremented to form
the EA.
EA = [Wn – = 2] Wn is pre-decremented to form
the EA.
EA = [Wn]+= 2 The contents of Wn forms
the EA, then Wn is
post-incremented.
EA = [Wn] – = 2 The contents of Wn forms
the EA, then Wn is
post-decremented.
EA = [Wn + Wb] The sum of Wn and Wb forms
the EA. Wn and Wb are not
modified.
Table 4-2 also shows that the Register Offset mode addresses data which is offset from a base
EA stored in a working register. This mode uses the contents of a second working register to form
the EA by adding the two specified working registers. This mode does not scale for Word mode
instructions, but offers the complete offset range of 64 Kbytes. Note that neither of the working
registers used to form the EA are modified. Example 4-5 shows how register offset indirect
addressing may be used to access data memory.
Note:
© 2005 Microchip Technology Inc.
The MOV with offset instructions (5-151 and 5-152) provides a literal addressing
offset ability to be used with indirect addressing. In these instructions, the EA is
formed by adding the contents of a working register to a signed 10-bit literal.
Example 4-6 shows how these instructions may be used to move data to and from
the working register array.
Preliminary
DS70157B-page 4-5
4
Instruction Set
Details
Table 4-2 shows that four Addressing modes modify the EA used in the instruction, and this
allows the following updates to be made to the working register: post-increment, post-decrement,
pre-increment and pre-decrement. Since all EAs must be given as byte addresses, support is
provided for Word mode instructions by scaling the EA update by 2. Namely, in Word mode,
pre/post-decrements subtract 2 from the EA stored in the working register, and
pre/post-increments add 2 to the EA. This feature ensures that after an EA modification is made,
the EA will point to the next adjacent word in memory. Example 4-4 shows how indirect
addressing may be used to update the EA.
dsPIC30F/33F Programmer’s Reference Manual
Example 4-4:
MOV.B
Indirect Addressing with Effective Address Update
[W0++], [W13--]
; byte move [W0] to [W13]
; post-inc W0, post-dec W13
Before Instruction:
W0 = 0x2300
W13 = 0x2708
Data Memory 0x2300 = 0x7783
Data Memory 0x2708 = 0x904E
After Instruction:
W0 = 0x2301
W13 = 0x2707
Data Memory 0x2300 = 0x7783
Data Memory 0x2708 = 0x9083
ADD
W1, [--W5], [++W8]
; pre-dec W5, pre-inc W8
; add W1 to [W5], store in [W8]
Before Instruction:
W1 =
W5 =
W8 =
Data
Data
0x0800
0x2200
0x2400
Memory 0x21FE = 0x7783
Memory 0x2402 = 0xAACC
After Instruction:
W1 =
W5 =
W8 =
Data
Data
DS70157B-page 4-6
0x0800
0x21FE
0x2402
Memory 0x21FE = 0x7783
Memory 0x2402 = 0x7F83
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-5:
MOV.B
Indirect Addressing with Register Offset
[W0+W1], [W7++]
; byte move [W0+W1] to W7, post-inc W7
Before Instruction:
W0 =
W1 =
W7 =
Data
Data
0x2300
0x01FE
0x1000
Memory 0x24FE = 0x7783
Memory 0x1000 = 0x11DC
After Instruction:
W0 =
W1 =
W7 =
Data
Data
LAC
0x2300
0x01FE
0x1001
Memory 0x24FE = 0x7783
Memory 0x1000 = 0x1183
[W0+W8], A
; load ACCA with [W0+W8]
; (sign-extend and zero-backfill)
Before Instruction:
W0 =
W8 =
ACCA
Data
0x2344
0x0008
= 0x00 7877 9321
Memory 0x234C = 0xE290
After Instruction:
W0 =
W8 =
ACCA
Data
Example 4-6:
MOV
0x2344
0x0008
= 0xFF E290 0000
Memory 0x234C = 0xE290
Move with Literal Offset Instructions
[W0+0x20], W1
; move [W0+0x20] to W1
Before Instruction:
W0 = 0x1200
W1 = 0x01FE
Data Memory 0x1220 = 0xFD27
4
After Instruction:
MOV
W4, [W8-0x300]
Instruction Set
Details
W0 = 0x1200
W1 = 0xFD27
Data Memory 0x1220 = 0xFD27
; move W4 to [W8-0x300]
Before Instruction:
W4 = 0x3411
W8 = 0x2944
Data Memory 0x2644 = 0xCB98
After Instruction:
W4 = 0x3411
W8 = 0x2944
Data Memory 0x2644 = 0x3411
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-7
dsPIC30F/33F Programmer’s Reference Manual
4.1.3.1
Register Indirect Addressing and the Instruction Set
The Addressing modes presented in Table 4-2 demonstrate the Indirect Addressing mode
capability of the dsPIC30F/33F. Due to operation encoding and functional considerations, not
every instruction which supports indirect addressing supports all modes shown in Table 4-2. The
majority of instructions which use indirect addressing support the No Modify, Pre-Increment,
Pre-Decrement, Post-Increment and Post-Decrement Addressing modes. The MOV instructions,
and several accumulator-based DSP instructions, are also capable of using the Register Offset
Addressing mode.
Note:
4.1.3.2
Instructions which use register indirect addressing use the operand symbols Wd
and Ws in the summary tables of Section 3. “Instruction Set Overview”.
DSP MAC Indirect Addressing Modes
A special class of Indirect Addressing modes is utilized by the DSP MAC instructions. As is
described later in Section 4.14 “DSP MAC Instructions”, the DSP MAC class of instructions are
capable of performing two fetches from memory using effective addressing. Since DSP
algorithms frequently demand a broader range of address updates, the Addressing modes
offered by the DSP MAC instructions provide greater range in the size of the effective address
update which may be made. Table 4-3 shows that both X and Y prefetches support
Post- Increment and Post-Decrement Addressing modes, with updates of 2, 4 and 6 bytes. Since
DSP instructions only execute in Word mode, no provisions are made for odd sized EA updates.
Table 4-3:
DSP MAC Indirect Addressing Modes
Addressing Mode
Y Memory
Indirect with no modification
EA = [Wx]
EA = [Wy]
Indirect with Post-Increment by 2
EA = [Wx] + = 2
EA = [Wy] + = 2
Indirect with Post-Increment by 4
EA = [Wx] + = 4
EA = [Wy] + = 4
Indirect with Post-Increment by 6
EA = [Wx] + = 6
EA = [Wy] + = 6
Indirect with Post-Decrement by 2
EA = [Wx] – = 2
EA = [Wy] – = 2
Indirect with Post-Decrement by 4
EA = [Wx] – = 4
EA = [Wy] – = 4
Indirect with Post-Decrement by 6
EA = [Wx] – = 6
EA = [Wy] – = 6
Indirect with Register Offset
EA = [W9 + W12]
EA = [W11 + W12]
Note:
4.1.3.3
X Memory
As described in Section 4.14 “DSP MAC Instructions”, only W8 and W9 may be
used to access X Memory, and only W10 and W11 may be used to access Y
Memory.
Modulo and Bit-Reversed Addressing Modes
The dsPIC30F/33F architecture provides support for two special Register Indirect Addressing
modes, which are commonly used to implement DSP algorithms. Modulo (or circular) addressing
provides an automated means to support circular data buffers in X and/or Y memory. Modulo
buffers remove the need for software to perform address boundary checks, which can improve
the performance of certain algorithms. Similarly, bit-reversed addressing allows one to access
the elements of a buffer in a nonlinear fashion. This Addressing mode simplifies data re-ordering
for radix-2 FFT algorithms and provides a significant reduction in FFT processing time.
Both of these Addressing modes are powerful features of the dsPIC30F and dsPIC33F architectures, which can be exploited by any instruction that uses indirect addressing. Refer to the
dsPIC30F Family Reference Manual (DS70046) for details on using modulo and bit-reversed
addressing.
DS70157B-page 4-8
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.1.4
Immediate Addressing
In immediate addressing, the instruction encoding contains a predefined constant operand,
which is used by the instruction. This Addressing mode may be used independently, but it is more
frequently combined with the File Register, Direct and Indirect Addressing modes. The size of
the immediate operand which may be used varies with the instruction type. Constants of size
1-bit (#lit1), 4-bit (#bit4, #lit4 and #Slit4), 5-bit (#lit5), 6-bit (#Slit6), 8-bit (#lit8), 10-bit (#lit10 and
#Slit10), 14-bit (#lit14) and 16-bit (#lit16) may be used. Constants may be signed or unsigned
and the symbols #Slit4, #Slit6 and #Slit10 designate a signed constant. All other immediate
constants are unsigned. Table 4-4 shows the usage of each immediate operand in the instruction
set.
Table 4-4:
Immediate Operands in the Instruction Set
Operand
Instruction Usage
#lit1
PWRSAV
#bit4
BCLR, BSET, BTG, BTSC, BTSS, BTST, BTST.C, BTST.Z, BTSTS, BTSTS.C,
BTSTS.Z
#lit4
ASR, LSR, SL
#Slit4
ADD, LAC, SAC, SAC.R
#lit5
ADD, ADDC, AND, CP, CPB, IOR, MUL.SU, MUL.UU, SUB, SUBB, SUBBR, SUBR,
XOR
#Slit6
SFTAC
#lit8
MOV.B
#lit10
ADD, ADDC, AND, CP, CPB, IOR, RETLW, SUB, SUBB, XOR
#Slit10
MOV
#lit14
DISI, DO, LNK, REPEAT
#lit16
MOV
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-9
dsPIC30F/33F Programmer’s Reference Manual
The syntax for immediate addressing requires that the number sign (#) must immediately
precede the constant operand value. The “#” symbol indicates to the assembler that the quantity
is a constant. If an out-of-range constant is used with an instruction, the assembler will generate
an error. Several examples of immediate addressing are shown in Example 4-7.
Example 4-7:
Immediate Addressing
PWRSAV #1
; Enter IDLE mode
ADD.B
; Add 0x10 to W0 (byte mode)
#0x10, W0
Before Instruction:
W0 = 0x12A9
After Instruction:
W0 = 0x12B9
XOR
W0, #1, [W1++]
; Exclusive-OR W0 and 0x1
; Store the result to [W1]
; Post-increment W1
Before Instruction:
W0 = 0xFFFF
W1 = 0x0890
Data Memory 0x0890 = 0x0032
After Instruction:
W0 = 0xFFFF
W1 = 0x0892
Data Memory 0x0890 = 0xFFFE
4.1.5
Data Addressing Mode Tree
The Data Addressing modes of the dsPIC30F and dsPIC33F are summarized in Figure 4-1.
Figure 4-1:
Data Addressing Mode Tree
Immediate
File Register
Basic
Direct
No Modification
Pre-Increment
Pre-Decrement
Indirect
Post-Increment
Post-Decrement
Literal Offset
Data Addressing Modes
Register Offset
Direct
DSP MAC
No Modification
Post-Increment (2, 4 and 6)
Indirect
Post-Decrement (2, 4 and 6)
Register Offset
DS70157B-page 4-10
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.2
Program Addressing Modes
Both the dsPIC30F and dsPIC33F have a 23-bit Program Counter (PC). The PC addresses the
24-bit wide program memory to fetch instructions for execution, and it may be loaded in several
ways. For byte compatibility with the table read and table write instructions, each instruction word
consumes two locations in program memory. This means that during serial execution, the PC is
loaded with PC + 2.
Several methods may be used to modify the PC in a non-sequential manner, and both absolute
and relative changes may be made to the PC. The change to the PC may be from an immediate
value encoded in the instruction, or a dynamic value contained in a working register. When DO
looping is active, the PC is loaded with the address stored in the DOSTART register, after the
instruction at the DOEND address is executed. For exception handling, the PC is loaded with the
address of the exception handler, which is stored in the interrupt vector table. When required, the
software stack is used to return scope to the foreground process from where the change in
program flow occurred.
Table 4-5 summarizes the instructions which modify the PC. When performing function calls, it is
recommended that RCALL be used instead of CALL, since RCALL only consumes 1 word of
program memory.
Table 4-5:
Methods of Modifying Program Flow
Condition/Instruction
PC Modification
Sequential Execution
Software Stack Usage
PC = PC + 2
None
BRA
(Branch Unconditionally)
PC = PC + 2*Slit16
None
BRA Condition, Expr(1)
(Branch Conditionally)
PC = PC + 2 (condition false)
PC = PC + 2 * Slit16 (condition true)
None
CALL Expr(1)
(Call Subroutine)
PC = lit23
CALL Wn
(Call Subroutine Indirect)
PC = Wn
GOTO Expr(1)
(Unconditional Jump)
PC = lit23
None
GOTO Wn
(Unconditional Indirect Jump)
PC = Wn
None
RCALL Expr(1)
(Relative Call)
PC = PC + 2 * Slit16
PC + 2 is PUSHed on
RCALL Wn
(Computed Relative Call)
PC = PC + 2 * Wn
Exception Handling
PC = address of the exception handler PC + 2 is PUSHed on
(read from vector table)
the stack(3)
PC = Target REPEAT instruction
(REPEAT Looping)
PC not modified (if REPEAT active)
None
PC = DOEND address
(DO Looping)
PC = DOSTART (if DO active)
None
Expr(1)
PC + 4 is PUSHed on
the stack(2)
PC + 2 is PUSHed on
the stack(2)
the stack(2)
the stack(2)
Note 1: For BRA, CALL and GOTO, the Expr may be a label, absolute address, or expression,
which is resolved by the linker to a 16-bit or 23-bit value (Slit16 or lit23). See
Section 5. “Instruction Descriptions” for details.
2: After CALL or RCALL is executed, RETURN or RETLW will POP the Top-of-Stack (TOS)
back into the PC.
3: After an exception is processed, RETFIE will POP the Top-of-Stack (TOS) back into the
PC.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-11
Instruction Set
Details
PC + 2 is PUSHed on
4
dsPIC30F/33F Programmer’s Reference Manual
4.3
Instruction Stalls
In order to maximize the data space EA calculation and operand fetch time, the X data space
read and write accesses are partially pipelined. A consequence of this pipelining is that address
register data dependencies may arise between successive read and write operations using
common registers.
‘Read After Write’ (RAW) dependencies occur across instruction boundaries and are detected by
the hardware. An example of a RAW dependency would be a write operation that modifies W5,
followed by a read operation that uses W5 as an Address Pointer. The contents of W5 will not be
valid for the read operation until the earlier write completes. This problem is resolved by stalling
the instruction execution for one instruction cycle, which allows the write to complete before the
next read is started.
4.3.1
RAW Dependency Detection
During the instruction pre-decode, the core determines if any address register dependency is
imminent across an instruction boundary. The stall detection logic compares the W register (if
any) used for the destination EA of the instruction currently being executed with the W register
to be used by the source EA (if any) of the prefetched instruction. When a match between the
destination and source registers is identified, a set of rules are applied to decide whether or not
to stall the instruction by one cycle. Table 4-6 lists various RAW conditions which cause an
instruction execution stall.
Table 4-6:
Raw Dependency Rules (Detection By Hardware)
Destination
Address Mode Using Wn
Source Address Mode
Using Wn
Stall
Required?
Examples
(Wn = W2)
Direct
Direct
No Stall
ADD.W
MOV.W
W0, W1, W2
W2, W3
Indirect
Direct
No Stall
ADD.W
MOV.W
W0, W1, [W2]
W2, W3
Indirect
Indirect
No Stall
ADD.W
MOV.W
W0, W1, [W2]
[W2], W3
Indirect
Indirect with
pre/post-modification
No Stall
ADD.W
MOV.W
W0, W1, [W2]
[W2++], W3
Indirect with
pre/post-modification
Direct
No Stall
ADD.W
MOV.W
W0, W1, [W2++]
W2, W3
Direct
Indirect
Stall(1)
ADD.W
MOV.W
W0, W1, W2
[W2], W3
Direct
Indirect with
pre/post-modification
Stall(1)
ADD.W
MOV.W
W0, W1, W2
[W2++], W3
Indirect
Indirect
Stall(1)
ADD.W
MOV.W
W0, W1, [W2](2)
[W2], W3(2)
Indirect
Indirect with
pre/post-modification
Stall(1)
ADD.W
MOV.W
W0, W1, [W2](2)
[W2++], W3(2)
Indirect with
pre/post-modification
Indirect
Stall(1)
ADD.W
MOV.W
W0, W1, [W2++]
[W2], W3
Indirect with
pre/post-modification
Indirect with
pre/post-modification
Stall(1)
ADD.W
MOV.W
W0, W1, [W2++]
[W2++], W3
Note 1: When stalls are detected, one cycle is added to the instruction execution time.
2: For these examples, the contents of W2 = the mapped address of W2 (0x0004).
DS70157B-page 4-12
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.3.2
Instruction Stalls and Exceptions
In order to maintain deterministic operation, instruction stalls are allowed to happen, even if they
occur immediately prior to exception processing.
4.3.3
Instruction Stalls and Instructions that Change Program Flow
CALL and RCALL write to the stack using W15 and may, therefore, be subject to an instruction
stall if the source read of the subsequent instruction uses W15.
GOTO, RETFIE and RETURN instructions are never subject to an instruction stall because they
do not perform write operations to the working registers.
4.3.4
Instruction Stalls and DO/REPEAT Loops
Instructions operating in a DO or REPEAT loop are subject to instruction stalls, just like any other
instruction. Stalls may occur on loop entry, loop exit and also during loop processing.
4.3.5
Instruction Stalls and PSV
Instructions operating in PSV address space are subject to instruction stalls, just like any other
instruction. Should a data dependency be detected in the instruction immediately following the
PSV data access, the second cycle of the instruction will initiate a stall. Should a data
dependency be detected in the instruction immediately before the PSV data access, the last
cycle of the previous instruction will initiate a stall.
Note:
4.4
Refer to the dsPIC30F Family Reference Manual (DS70046) for more detailed information about RAW instruction stalls.
Byte Operations
Since the data memory is byte addressable, most of the base instructions may operate in either
Byte mode or Word mode. When these instructions operate in Byte mode, the following rules
apply:
• all direct working register references use the Least Significant Byte of the 16-bit working
register and leave the Most Significant Byte (MSB) unchanged
• all indirect working register references use the data byte specified by the 16-bit address
stored in the working register
• all file register references use the data byte specified by the byte address
• the STATUS Register is updated to reflect the result of the byte operation
Note:
Instructions which operate in Byte mode must use the “.b” or “.B” instruction
extension to specify a byte instruction. For example, the following two instructions
are valid forms of a byte clear operation:
CLR.b
CLR.B
© 2005 Microchip Technology Inc.
W0
W0
Preliminary
DS70157B-page 4-13
Instruction Set
Details
It should be noted that data addresses are always represented as byte addresses. Additionally,
the native data format is little-endian, which means that words are stored with the Least
Significant Byte at the lower address, and the Most Significant Byte at the adjacent, higher
address (as shown in Figure 4-2). Example 4-8 shows sample byte move operations and
Example 4-9 shows sample byte math operations.
4
dsPIC30F/33F Programmer’s Reference Manual
Example 4-8:
MOV.B
Sample Byte Move Operations
#0x30, W0
; move the literal byte 0x30 to W0
Before Instruction:
W0 = 0x5555
After Instruction:
W0 = 0x5530
MOV.B
0x1000, W0
; move the byte at 0x1000 to W0
Before Instruction:
W0 = 0x5555
Data Memory 0x1000 = 0x1234
After Instruction:
W0 = 0x5534
Data Memory 0x1000 = 0x1234
MOV.B
W0, 0x1001
; byte move W0 to address 0x1001
Before Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x5555
After Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x3455
MOV.B
W0, [W1++]
; byte move W0 to [W1], then post-inc W1
Before Instruction:
W0 = 0x1234
W1 = 0x1001
Data Memory 0x1000 = 0x5555
After Instruction:
W0 = 0x1234
W1 = 0x1002
Data Memory 0x1000 = 0x3455
DS70157B-page 4-14
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-9:
CLR.B
Sample Byte Math Operations
[W6--]
; byte clear [W6], then post-dec W6
Before Instruction:
W6 = 0x1001
Data Memory 0x1000 = 0x5555
After Instruction:
W6 = 0x1000
Data Memory 0x1000 = 0x0055
SUB.B
W0, #0x10, W1
; byte subtract literal 0x10 from W0
; and store to W1
Before Instruction:
W0 = 0x1234
W1 = 0xFFFF
After Instruction:
W0 = 0x1234
W1 = 0xFF24
ADD.B
W0, W1, [W2++]
; byte add W0 and W1, store to [W2]
; and post-inc W2
Before Instruction:
W0 =
W1 =
W2 =
Data
0x1234
0x5678
0x1000
Memory 0x1000 = 0x5555
After Instruction:
W0 =
W1 =
W2 =
Data
0x1234
0x5678
0x1001
Memory 0x1000 = 0x55AC
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-15
dsPIC30F/33F Programmer’s Reference Manual
4.5
Word Move Operations
Even though the data space is byte addressable, all move operations made in Word mode must
be word-aligned. This means that for all source and destination operands, the Least Significant
address bit must be ‘0’. If a word move is made to or from an odd address, an address error
exception is generated. Likewise, all double words must be word-aligned. Figure 4-2 shows how
bytes and words may be aligned in data memory. Example 4-10 contains several legal word
move operations.
When an exception is generated due to a misaligned access, the exception is taken after the
instruction executes. If the illegal access occurs from a data read, the operation will be allowed
to complete, but the Least Significant bit of the source address will be cleared to force word alignment. If the illegal access occurs during a data write, the write will be inhibited. Example 4-11
contains several illegal word move operations.
Figure 4-2:
Data Alignment in Memory
b0
0x1001
0x1003
b1
0x1000
0x1002
0x1005
b3
b2
0x1004
0x1007
b5
b4
0x1006
0x1009
b7
b6
0x1008
b8
0x100A
0x100B
Legend:
b0 – byte stored at 0x1000
b1 – byte stored at 0x1003
b3:b2 – word stored at 0x1005:1004 (b2 is LSB)
b7:b4 – double word stored at 0x1009:0x1006 (b4 is LSB)
b8 – byte stored at 0x100A
Note:
Instructions which operate in Word mode are not required to use an instruction
extension. However, they may be specified with an optional “.w” or “.W” extension,
if desired. For example, the following instructions are valid forms of a word clear
operation:
CLR
CLR.w
CLR.W
DS70157B-page 4-16
W0
W0
W0
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-10:
MOV
Legal Word Move Operations
#0x30, W0
; move the literal word 0x30 to W0
Before Instruction:
W0 = 0x5555
After Instruction:
W0 = 0x0030
MOV
0x1000, W0
; move the word at 0x1000 to W0
Before Instruction:
W0 = 0x5555
Data Memory 0x1000 = 0x1234
After Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x1234
MOV
[W0], [W1++]
; word move [W0] to [W1],
; then post-inc W1
Before Instruction:
W0 =
W1 =
Data
Data
0x1234
0x1000
Memory 0x1000 = 0x5555
Memory 0x1234 = 0xAAAA
After Instruction:
W0 =
W1 =
Data
Data
0x1234
0x1002
Memory 0x1000 = 0xAAAA
Memory 0x1234 = 0xAAAA
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-17
dsPIC30F/33F Programmer’s Reference Manual
Example 4-11:
MOV
Illegal Word Move Operations
0x1001, W0
; move the word at 0x1001 to W0
Before Instruction:
W0 = 0x5555
Data Memory 0x1000 = 0x1234
Data Memory 0x1002 = 0x5678
After Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x1234
Data Memory 0x1002 = 0x5678
ADDRESS ERROR TRAP GENERATED
(source address is misaligned, so MOV is performed)
MOV
W0, 0x1001
; move W0 to the word at 0x1001
Before Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x5555
Data Memory 0x1002 = 0x6666
After Instruction:
W0 = 0x1234
Data Memory 0x1000 = 0x5555
Data Memory 0x1002 = 0x6666
ADDRESS ERROR TRAP GENERATED
(destination address is misaligned, so MOV is not performed)
MOV
[W0], [W1++]
; word move [W0] to [W1],
; then post-inc W1
Before Instruction:
W0 =
W1 =
Data
Data
Data
0x1235
0x1000
Memory 0x1000 = 0x1234
Memory 0x1234 = 0xAAAA
Memory 0x1236 = 0xBBBB
After Instruction:
W0 =
W1 =
Data
Data
Data
0x1235
0x1002
Memory 0x1000 = 0xAAAA
Memory 0x1234 = 0xAAAA
Memory 0x1236 = 0xBBBB
ADDRESS ERROR TRAP GENERATED
(source address is misaligned, so MOV is performed)
DS70157B-page 4-18
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.6
Using 10-bit Literal Operands
Several instructions which support Byte and Word mode have 10-bit operands. For byte
instructions, a 10-bit literal is too large to use. So when 10-bit literals are used in Byte mode, the
range of the operand must be reduced to 8 bits or the assembler will generate an error. Table 4-7
shows that the range of a 10-bit literal is 0:1023 in Word mode and 0:255 in Byte mode.
Instructions which employ 10-bit literals in Byte and Word mode are: ADD, ADDC, AND, IOR,
RETLW, SUB, SUBB and XOR. Example 4-12 shows how positive and negative literals are used
in Byte mode for the ADD instruction.
Table 4-7:
10-bit Literal Coding
Word Mode
kk kkkk kkkk
Byte Mode
kkkk kkkk
0
00 0000 0000
0000 0000
1
00 0000 0001
0000 0001
Literal Value
2
00 0000 0010
0000 0010
127
00 0111 1111
0111 1111
128
00 1000 0000
1000 0000
255
00 1111 1111
1111 1111
256
01 0000 0000
N/A
512
10 0000 0000
N/A
1023
11 1111 1111
N/A
Example 4-12:
ADD.B
ADD.B
ADD.B
ADD.B
ADD.B
ADD.B
ADD.B
Note:
#0x80, W0
#0x380, W0
#0xFF, W0
#0x3FF, W0
#0xF, W0
#0x7F, W0
#0x100, W0
;
;
;
;
;
;
;
add 128 (or -128) to W0
ERROR... Illegal syntax for byte mode
add 255 (or -1) to W0
ERROR... Illegal syntax for byte mode
add 15 to W0
add 127 to W0
ERROR... Illegal syntax for byte mode
Using a literal value greater than 127 in Byte mode is functionally identical to using
the equivalent negative two’s complement value, since the Most Significant bit of the
byte is set. When operating in Byte mode, the Assembler will accept either a positive
or negative literal value (i.e., #-10).
Preliminary
DS70157B-page 4-19
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Using 10-bit Literals For Byte Operands
dsPIC30F/33F Programmer’s Reference Manual
4.7
Software Stack Pointer and Frame Pointer
4.7.1
Software Stack Pointer
Both the dsPIC30F and dsPIC33F feature a software stack which facilitates function calls and
exception handling. W15 is the default Stack Pointer (SP) and after any Reset, it is initialized to
0x0800. This ensures that the SP will point to valid RAM in all dsPIC30F and dsPIC33F devices
and permits stack availability for exceptions, which may occur before the SP is set by the user
software. The user may reprogram the SP during initialization to any location within data space.
The SP always points to the first available free word (Top-of-Stack) and fills the software stack,
working from lower addresses towards higher addresses. It pre-decrements for a stack POP
(read) and post-increments for a stack PUSH (write).
The software stack is manipulated using the PUSH and POP instructions. The PUSH and POP
instructions are the equivalent of a MOV instruction, with W15 used as the destination pointer. For
example, the contents of W0 can be PUSHed onto the Top-of-Stack (TOS) by:
PUSH W0
This syntax is equivalent to
MOV W0,[W15++]
The contents of the TOS can be returned to W0 by
POP W0
This syntax is equivalent to
MOV [--W15],W0
During any CALL instruction, the PC is PUSHed onto the stack, such that when the subroutine
completes execution, program flow may resume from the correct location. When the PC is
PUSHed onto the stack, PC<15:0> is PUSHed onto the first available stack word, then
PC<22:16> is PUSHed. When PC<22:16> is PUSHed, the Most Significant 7 bits of the PC are
zero-extended before the PUSH is made, as shown in Figure 4-3. During exception processing,
the Most Significant 7 bits of the PC are concatenated with the lower byte of the STATUS register
(SRL) and IPL<3>, CORCON<3>. This allows the primary STATUS register contents and CPU
Interrupt Priority Level to be automatically preserved during interrupts.
Note:
In order to protect against misaligned stack accesses, W15<0> is always clear.
Figure 4-3:
Stack Operation for CALL Instruction
0x0000
Stack Grows Towards
Higher Address
15
0
PC<15:0>
0x0
W15 (before CALL)
PC<22:16>
Top-of-Stack
W15 (after CALL)
0xFFFE
Note:
DS70157B-page 4-20
For exceptions, the upper nine bits of the second PUSHed word contains
the SRL and IPL<3>.
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.7.2
Stack Pointer Example
Figure 4-4 through Figure 4-7 show how the software stack is modified for the code snippet
shown in Example 4-13. Figure 4-4 shows the software stack before the first PUSH has executed.
Note that the SP has the initialized value of 0x0800. Furthermore, the example loads 0x5A5A
and 0x3636 to W0 and W1, respectively. The stack is PUSHed for the first time in Figure 4-5 and
the value contained in W0 is copied to TOS. W15 is automatically updated to point to the next
available stack location, and the new TOS is 0x0802. In Figure 4-6, the contents of W1 are
PUSHed onto the stack, and the new TOS becomes 0x0804. In Figure 4-7, the stack is POPped,
which copies the last PUSHed value (W1) to W3. The SP is decremented during the POP
operation, and at the end of the example, the final TOS is 0x0802.
Example 4-13:
MOV
MOV
PUSH
PUSH
POP
Figure 4-4:
Stack Pointer Usage
#0x5A5A, W0
#0x3636, W1
W0
W1
W3
;
;
;
;
;
Load W0
Load W1
Push W0
Push W1
Pop TOS
with 0x5A5A
with 0x3636
to TOS (see Figure 4-5)
to TOS (see Figure 4-6)
to W3 (see Figure 4-7)
Stack Pointer Before The First PUSH
0x0000
0x0800
<TOS>
W15 (SP)
0xFFFE
W0 = 0x5A5A
W1 = 0x3636
W15 = 0x0800
Figure 4-5:
Stack Pointer After “PUSH W0” Instruction
4
0x0000
5A5A
<TOS>
Instruction Set
Details
0x0800
0x0802
W15 (SP)
0xFFFE
W0 = 0x5A5A
W1 = 0x3636
W15 = 0x0802
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-21
dsPIC30F/33F Programmer’s Reference Manual
Figure 4-6:
Stack Pointer After “PUSH W1” Instruction
0x0000
0x0800
0x0802
0x0804
5A5A
3636
<TOS>
W15 (SP)
0xFFFE
W0 = 0x5A5A
W1 = 0x3636
W15 = 0x0804
Figure 4-7:
Stack Pointer After “POP W3” Instruction
0x0000
0x0800
0x0802
0x0804
5A5A
<TOS>
W15 (SP)
0xFFFE
W0 = 0x5A5A
W1 = 0x3636
W3 = 0x3636
W15 = 0x0802
Note: The contents of 0x802, the new TOS, remain unchanged (0x3636).
4.7.3
Software Stack Frame Pointer
A Stack Frame is a user defined section of memory residing in the software stack. It is used to
allocate memory for temporary variables which a function uses, and one Stack Frame may be
created for each function. W14 is the default Stack Frame Pointer (FP) and it is initialized to
0x0000 on any Reset. If the Stack Frame Pointer is not used, W14 may be used like any other
working register.
The link (LNK) and unlink (ULNK) instructions provide Stack Frame functionality. The LNK
instruction is used to create a Stack Frame. It is used during a call sequence to adjust the SP,
such that the stack may be used to store temporary variables utilized by the called function. After
the function completes execution, the ULNK instruction is used to remove the Stack Frame created by the LNK instruction. The LNK and ULNK instructions must always be used together to
avoid stack overflow.
DS70157B-page 4-22
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.7.4
Stack Frame Pointer Example
Figure 4-8 through Figure 4-10 show how a Stack Frame is created and removed for the code
snippet shown in Example 4-14. This example demonstrates how a Stack Frame operates and
is not indicative of the code generated by the dsPIC30F/33F compiler. Figure 4-8 shows the
stack condition at the beginning of the example, before any registers are PUSHed to the stack.
Here, W15 points to the first free stack location (TOS) and W14 points to a portion of stack
memory allocated for the routine that is currently executing.
Before calling the function “COMPUTE”, the parameters of the function (W0, W1 and W2) are
PUSHed on the stack. After the “CALL COMPUTE” instruction is executed, the PC changes to the
address of “COMPUTE” and the return address of the function “TASKA” is placed on the stack
(Figure 4-9). Function “COMPUTE” then uses the “LNK #4” instruction to PUSH the calling
routine’s Frame Pointer value onto the stack and the new Frame Pointer will be set to point to the
current Stack Pointer. Then, the literal 4 is added to the Stack Pointer address in W15, which
reserves memory for two words of temporary data (Figure 4-10).
Inside the function “COMPUTE”, the FP is used to access the function parameters and temporary
(local) variables. [W14 + n] will access the temporary variables used by the routine and
[W14 – n] is used to access the parameters. At the end of the function, the ULNK instruction is
used to copy the Frame Pointer address to the Stack Pointer and then POP the calling subroutine’s Frame Pointer back to the W14 register. The ULNK instruction returns the stack back to the
state shown in Figure 4-9.
A RETURN instruction will return to the code that called the subroutine. The calling code is
responsible for removing the parameters from the stack. The RETURN and POP instructions
restore the stack to the state shown in Figure 4-8.
Example 4-14:
TASKA:
...
PUSH
PUSH
PUSH
CALL
POP
POP
POP
...
W0
W1
W2
COMPUTE
W2
W1
W0
;
;
;
;
;
;
;
Push parameter 1
Push parameter 2
Push parameter 3
Call COMPUTE function
Pop parameter 3
Pop parameter 2
Pop parameter 1
4
; Stack FP, allocate 4 bytes for local variables
; Free allocated memory, restore original FP
; Return to TASKA
Stack at the Beginning of Example 4-14
0x0000
0x0800
Frame
of
TASKA
W14 (FP)
<TOS>
W15 (SP)
0xFFFE
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-23
Instruction Set
Details
COMPUTE:
LNK
#4
...
ULNK
RETURN
Figure 4-8:
Frame Pointer Usage
dsPIC30F/33F Programmer’s Reference Manual
Figure 4-9:
Stack After “CALLCOMPUTE” Executes
0x0000
0x0800
Frame
of
TASKA
Parameter 1
Parameter 2
Parameter 3
PC<15:0>
0:PC<22:16>
<TOS>
W14 (FP)
W15 (SP)
0xFFFE
Figure 4-10:
Stack After “LNK #4” Executes
0x0000
0x0800
Frame
of
TASKA
Parameter 1
Parameter 2
Parameter 3
PC<15:0>
0:PC<22:16>
FP of TASKA
Temp Word 1
Temp Word 2
<TOS>
W14 (FP)
W15 (SP)
0xFFFE
4.7.5
Stack Pointer Overflow
There is a stack limit register (SPLIM) associated with the Stack Pointer that is reset to 0x0000.
SPLIM is a 16-bit register, but SPLIM<0> is fixed to ‘0’, because all stack operations must be
word-aligned.
The stack overflow check will not be enabled until a word write to SPLIM occurs, after which time
it can only be disabled by a device Reset. All effective addresses generated using W15 as a
source or destination are compared against the value in SPLIM. Should the effective address be
greater than the contents of SPLIM, then a stack error trap is generated.
If stack overflow checking has been enabled, a stack error trap will also occur if the W15 effective
address calculation wraps over the end of data space (0xFFFF).
Refer to the dsPIC30F Family Reference Manual (DS70046) for more information on the stack
error trap.
4.7.6
Stack Pointer Underflow
The stack is initialized to 0x0800 during Reset. A stack error trap will be initiated should the Stack
Pointer address ever be less than 0x0800.
Note:
DS70157B-page 4-24
Locations in data space between 0x0000 and 0x07FF are, in general, reserved for
core and peripheral Special Function Registers (SFR).
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.8
Conditional Branch Instructions
Conditional branch instructions are used to direct program flow, based on the contents of the
STATUS register. These instructions are generally used in conjunction with a Compare class
instruction, but they may be employed effectively after any operation that modifies the STATUS
register.
The compare instructions CP, CP0 and CPB, perform a subtract operation (minuend –
subtrahend), but do not actually store the result of the subtraction. Instead, compare instructions
just update the flags in the STATUS register, such that an ensuing conditional branch instruction
may change program flow by testing the contents of the updated STATUS register. If the result
of the STATUS register test is true, the branch is taken. If the result of the STATUS register test
is false, the branch is not taken.
The conditional branch instructions supported by the dsPIC30F and dsPIC33F devices are
shown in Table 4-8. This table identifies the condition in the STATUS register which must be true
for the branch to be taken. In some cases, just a single bit is tested (as in BRA C), while in other
cases, a complex logic operation is performed (as in BRA GT). It is worth noting that both signed
and unsigned conditional tests are supported, and that support is provided for DSP algorithms
with the OA, OB, SA and SB condition mnemonics.
Table 4-8:
Conditional Branch Instructions
Condition
Mnemonic(1)
Description
Status Test
C
Carry (not Borrow)
C
GE
Signed greater than or equal
(N&&OV) || (N&&OV)
GEU(2)
Unsigned greater than or equal
C
GT
Signed greater than
(Z&&N&&OV) || (Z&&N&&OV)
GTU
Unsigned greater than
C&&Z
LE
Signed less than or equal
Z || (N&&OV) || (N&&OV)
LEU
Unsigned less than or equal
C || Z
LT
Signed less than
(N&&OV) || (N&&OV)
(3)
Unsigned less than
C
N
Negative
N
NC
Not Carry (Borrow)
C
NN
Not Negative
N
NOV
Not Overflow
OV
NZ
Not Zero
Z
OA
Accumulator A overflow
OA
OB
Accumulator B overflow
OB
OV
Overflow
OV
SA
Accumulator A saturate
SA
SB
Accumulator B saturate
SB
Z
Zero
Z
4
Instruction Set
Details
LTU
Note 1: Instructions are of the form: BRA mnemonic, Expr.
2: GEU is identical to C and will reverse assemble to BRA C, Expr.
3: LTU is identical to NC and will reverse assemble to BRA NC, Expr.
Note:
© 2005 Microchip Technology Inc.
The “Compare and Skip” instructions (CPSEQ, CPSGT, CPSLT, CPSNE) do not
modify the STATUS register.
Preliminary
DS70157B-page 4-25
dsPIC30F/33F Programmer’s Reference Manual
4.9
Z Status Bit
The Z Status bit is a special zero Status bit that is useful for extended precision arithmetic. The
Z bit functions like a normal Z flag for all instructions, except those that use the carry/borrow input
(ADDC, CPB, SUBB and SUBBR). For the ADDC, CPB, SUBB and SUBBR instructions, the Z bit
can only be cleared and never set. If the result of one of these instructions is non-zero, the Z bit
will be cleared and will remain cleared, regardless of the result of subsequent ADDC, CPB, SUBB
or SUBBR operations. This allows the Z bit to be used for performing a simple zero check on the
result of a series of extended precision operations.
A sequence of instructions working on multi-precision data (starting with an instruction with no
carry/borrow input), will automatically logically AND the successive results of the zero test. All
results must be zero for the Z flag to remain set at the end of the sequence of operations. If the
result of the ADDC, CPB, SUBB or SUBBR instruction is non-zero, the Z bit will be cleared and
remain cleared for all subsequent ADDC, CPB, SUBB or SUBBR instructions. Example 4-15
shows how the Z bit operates for a 32-bit addition. It shows how the Z bit is affected for a 32-bit
addition implemented with an ADD/ADDC instruction sequence. The first example generates a
zero result for only the most significant word, and the second example generates a zero result
for both the least significant word and most significant word.
Example 4-15:
‘Z’ Status bit Operation for 32-bit Addition
; Add two doubles (W0:W1 and W2:W3)
; Store the result in W5:W4
ADD
W0, W2, W4
; Add LSWord and store to W4
ADDC
W1, W3, W5
; Add MSWord and store to W5
Before 32-bit Addition (zero result for the most significant word):
W0
W1
W2
W3
W4
W5
SR
=
=
=
=
=
=
=
0x2342
0xFFF0
0x39AA
0x0010
0x0000
0x0000
0x0000
After 32-bit Addition:
W0
W1
W2
W3
W4
W5
SR
=
=
=
=
=
=
=
0x2342
0xFFF0
0x39AA
0x0010
0x5CEC
0x0000
0x0201 (DC,C=1)
Before 32-bit Addition (zero result for the least significant word and most significant word):
W0
W1
W2
W3
W4
W5
SR
=
=
=
=
=
=
=
0xB76E
0xFB7B
0x4892
0x0484
0x0000
0x0000
0x0000
After 32-bit Addition:
W0
W1
W2
W3
W4
W5
SR
DS70157B-page 4-26
=
=
=
=
=
=
=
0xB76E
0xFB7B
0x4892
0x0485
0x0000
0x0000
0x0103 (DC,Z,C=1)
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.10
Assigned Working Register Usage
The 16 working registers of the dsPIC30F and dsPIC33F provide a large register set for efficient
code generation and algorithm implementation. In an effort to maintain an instruction set that provides advanced capability, a stable run-time environment and backwards compatibility with earlier
Microchip processor cores, some working registers have a pre-assigned usage. Table 4-9 summarizes these working register assignments, with details provided in subsections Section 4.10.1
“Implied DSP Operands” through Section 4.10.3 “PICmicro® Microcontroller Compatibility”.
Table 4-9:
Special Working Register Assignments
Register
4.10.1
Special Assignment
W0
Default WREG, Divide Quotient
W1
Divide Remainder
W2
“MUL f” Product least significant word
W3
“MUL f” Product most significant word
W4
MAC Operand
W5
MAC Operand
W6
MAC Operand
W7
MAC Operand
W8
MAC Prefetch Address (X Memory)
W9
MAC Prefetch Address (X Memory)
W10
MAC Prefetch Address (Y Memory)
W11
MAC Prefetch Address (Y Memory)
W12
MAC Prefetch Offset
W13
MAC Write Back Destination
W14
Frame Pointer
W15
Stack Pointer
Implied DSP Operands
To assist instruction encoding and maintain uniformity among the DSP class of instructions,
some working registers have pre-assigned functionality. For all DSP instructions which have
prefetch ability, the following 10 register assignments must be adhered to:
4
W4-W7 are used for arithmetic operands
W8-W11 are used for prefetch addresses (pointers)
W12 is used for the prefetch register offset index
W13 is used for the accumulator Write Back destination
These restrictions only apply to the DSP MAC class of instructions, which utilize working registers and have prefetch ability (described in Section 4.15 “DSP Accumulator Instructions”).
The affected instructions are CLR, ED, EDAC, MAC, MOVSAC, MPY, MPY.N and MSC.
The DSP Accumulator class of instructions (described in Section 4.15 “DSP Accumulator
Instructions”) are not required to follow the working register assignments in Table 4-9 and may
freely use any working register when required.
4.10.2
Implied Frame and Stack Pointer
To accommodate software stack usage, W14 is the implied Frame Pointer (used by the LNK and
ULNK instructions) and W15 is the implied Stack Pointer (used by the CALL, LNK, POP, PUSH,
RCALL, RETFIE, RETLW, RETURN, TRAP and ULNK instructions). Even though W14 and
W15 have this implied usage, they may still be used as generic operands in any instruction, with
the exceptions outlined in Section 4.10.1 “Implied DSP Operands”. If W14 and W15 must be
used for other purposes (it is strongly advised that they remain reserved for the Frame and Stack
Pointer), extreme care must be taken such that the run-time environment is not corrupted.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-27
Instruction Set
Details
•
•
•
•
dsPIC30F/33F Programmer’s Reference Manual
4.10.3
PICmicro® Microcontroller Compatibility
4.10.3.1
Default Working Register WREG
To ease the migration path for users of the Microchip PICmicro MCU families, the dsPIC30F and
dsPIC33F have matched the functionality of the PICmicro MCU instruction sets as closely as
possible. One major difference between the dsPIC30F/33F and the PICmicro MCU processors
is the number of working registers provided. The PICmicro MCU families only provide one 8-bit
working register, while the dsPIC30F and dsPIC33F provide sixteen, 16-bit working registers. To
accommodate for the one working register of the PICmicro MCU, the dsPIC30F/33F instruction
set has designated one working register to be the default working register for all legacy file register instructions. The default working register is set to W0, and it is used by all instructions which
use file register addressing.
Additionally, the syntax used by the dsPIC30F/33F assembler to specify the default working register is similar to that used by the PICmicro MCU assembler. As shown in the detailed instruction
descriptions in Section 5. “Instruction Descriptions”, “WREG” must be used to specify the
default working register. Example 4-16 shows several instructions which use WREG.
Example 4-16:
ADD
ASR
CLR.B
DEC
MOV
SETM
XOR
4.10.3.2
Using the Default Working Register WREG
RAM100
RAM100, WREG
WREG
RAM100, WREG
WREG, RAM100
WREG
RAM100
;
;
;
;
;
;
;
add RAM100 and WREG, store in RAM100
shift RAM100 right, store in WREG
clear the WREG LS Byte
decrement RAM100, store in WREG
move WREG to RAM100
set all bits in the WREG
XOR RAM100 and WREG, store in RAM100
PRODH:PRODL Register Pair
Another significant difference between the Microchip PICmicro MCU and dsPIC30F/33F architectures is the multiplier. Some PICmicro MCU families support an 8-bit x 8-bit multiplier, which
places the multiply product in the PRODH:PRODL register pair. The dsPIC30F and dsPIC33F
have a 17-bit x 17-bit multiplier, which may place the result into any two successive working registers (starting with an even register), or an accumulator.
Despite this architectural difference, the dsPIC30F and dsPIC33F still support the legacy file register multiply instruction (MULWF) with the “MUL{.B} f” instruction (described on page 5-169).
Supporting the legacy MULWF instruction has been accomplished by mapping the
PRODH:PRODL registers to the working register pair W3:W2. This means that when
“MUL{.B} f” is executed in Word mode, the multiply generates a 32-bit product which is stored
in W3:W2, where W3 has the most significant word of the product and W2 has the least significant word of the product. When “MUL{.B} f” is executed in Byte mode, the 16-bit product is
stored in W2, and W3 is unaffected. Examples of this instruction are shown in Example 4-17.
DS70157B-page 4-28
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-17:
MUL.B
Unsigned f and WREG Multiply (Legacy MULWF Instruction)
0x100
; (0x100)*WREG (byte mode), store to W2
Before Instruction:
W0 (WREG) = 0x7705
W2 = 0x1235
W3 = 0x1000
Data Memory 0x0100 = 0x1255
After Instruction:
W0 (WREG) = 0x7705
W2 = 0x01A9
W3 = 0x1000
Data Memory 0x0100 = 0x1255
MUL
0x100
; (0x100)*WREG (word mode), store to W3:W2
Before Instruction:
W0 (WREG) = 0x7705
W2 = 0x1235
W3 = 0x1000
Data Memory 0x0100 = 0x1255
After Instruction:
W0 (WREG) = 0x7705
W2 = 0xDEA9
W3 = 0x0885
Data Memory 0x0100 = 0x1255
4.10.3.3
Moving Data with WREG
The “MOV{.B} f {,WREG}” instruction (described on page 5-145) and “MOV{.B} WREG, f”
instruction (described on page 5-146) allow for byte or word data to be moved between file
register memory and the WREG (working register W0). These instructions provide equivalent
functionality to the legacy Microchip PICmicro MCU MOVF and MOVWF instructions.
The “MOV{.B} f {,WREG}” and “MOV{.B} WREG, f” instructions are the only MOV instructions
which support moves of byte data to and from file register memory. Example 4-18 shows several
MOV instruction examples using the WREG.
Note:
Example 4-18:
MOV.B
MOV
MOV.B
MOV
© 2005 Microchip Technology Inc.
Moving Data with WREG
0x1001, WREG
0x1000, WREG
WREG, TBLPAG
WREG, 0x804
;
;
;
;
move
move
move
move
the
the
the
the
Preliminary
byte
word
byte
word
stored
stored
stored
stored
at
at
at
at
location 0x1001 to W0
location 0x1000 to W0
W0 to the TBLPAG register
W0 to location 0x804
DS70157B-page 4-29
4
Instruction Set
Details
When moving word data between file register memory and the working register
array, the “MOV Wns, f” and “MOV f, Wnd” instructions allow any working register
(W0:W15) to be used as the source or destination register, not just WREG.
dsPIC30F/33F Programmer’s Reference Manual
4.11
DSP Data Formats
4.11.1
Integer and Fractional Data
The dsPIC30F and dsPIC33F devices support both integer and fractional data types. Integer
data is inherently represented as a signed two’s complement value, where the Most Significant
bit is defined as a sign bit. Generally speaking, the range of an N-bit two’s complement integer
is -2N-1 to 2N-1 – 1. For a 16-bit integer, the data range is -32768 (0x8000) to 32767 (0x7FFF),
including ‘0’. For a 32-bit integer, the data range is -2,147,483,648 (0x8000 0000) to
2,147,483,647 (0x7FFF FFFF).
Fractional data is represented as a two’s complement number, where the Most Significant bit is
defined as a sign bit, and the radix point is implied to lie just after the sign bit. This format is
commonly referred to as 1.15 (or Q15) format, where 1 is the number of bits used to represent
the integer portion of the number, and 15 is the number of bits used to represent the fractional
portion. The range of an N-bit two’s complement fraction with this implied radix point is -1.0 to
(1 – 21-N). For a 16-bit fraction, the 1.15 data range is -1.0 (0x8000) to 0.999969482 (0x7FFF),
including 0.0 and it has a precision of 3.05176x10-5. In Normal Saturation mode, the 32-bit
accumulators use a 1.31 format, which enhances the precision to 4.6566x10-10.
Super Saturation mode expands the dynamic range of the accumulators by using the 8 bits of
the Upper Accumulator register (ACCxU) as guard bits. Guard bits are used if the value stored
in the accumulator overflows beyond the 32nd bit, and they are useful for implementing DSP
algorithms. This mode is enabled when the ACCSAT bit (CORCON<4>), is set to ‘1’ and it
expands the accumulators to 40 bits. The accumulators then support an integer range of
-5.498x1011 (0x80 0000 0000) to 5.498x1011 (0x7F FFFF FFFF). In Fractional mode, the guard
bits of the accumulator do not modify the location of the radix point and the 40-bit accumulators
use a 9.31 fractional format. Note that all fractional operation results are stored in the 40-bit Accumulator, justified with a 1.31 radix point. As in Integer mode, the guard bits merely increase the
dynamic range of the accumulator. 9.31 fractions have a range of -256.0 (0x80 0000 0000) to
(256.0 – 4.65661x10-10) (0x7F FFFF FFFF). Table 4-10 identifies the range and precision of
integers and fractions on the dsPIC30F/33F devices for 16-bit, 32-bit and 40-bit registers.
It should be noted that, with the exception of DSP multiplies, the ALU operates identically on integer and fractional data. Namely, an addition of two integers will yield the same result (binary number) as the addition of two fractional numbers. The only difference is how the result is interpreted
by the user. However, multiplies performed by DSP operations are different. In these instructions,
data format selection is made by the IF bit, CORCON<0>, and it must be set accordingly (‘0’ for
Fractional mode, ‘1’ for Integer mode). This is required because of the implied radix point used
by dsPIC30F/33F fractional numbers. In Integer mode, multiplying two 16-bit integers produces
a 32-bit integer result. However, multiplying two 1.15 values generates a 2.30 result. Since the
dsPIC30F and dsPIC33F devices use a 1.31 format for the accumulators, a DSP multiply in Fractional mode also includes a left shift of one bit to keep the radix point properly aligned. This
feature reduces the resolution of the DSP multiplier to 2-30, but has no other effect on the
computation (e.g., 0.5 x 0.5 = 0.25).
Table 4-10:
dsPIC30F/33F Data Ranges
Register Size
DS70157B-page 4-30
Integer Range
Fraction Range
Fraction Resolution
16-bit
-32768 to
32767
-1.0 to (1.0 – 2-15)
3.052 x 10-5
32-bit
-2,147,483,648 to
2,147,483,647
-1.0 to (1.0 – 2-31)
4.657 x 10-10
40-bit
-549,755,813,888 to
549,755,813,887
-256.0 to (256.0 – 2-31) 4.657 x 10-10
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.11.2
Integer and Fractional Data Representation
Having a working knowledge of how integer and fractional data are represented on the dsPIC30F
and dsPIC33F is fundamental to working with the device. Both integer and fractional data treat
the Most Significant bit as a sign bit, and the binary exponent decreases by one as the bit position
advances toward the Least Significant bit. The binary exponent for an N-bit integer starts at (N-1)
for the Most Significant bit, and ends at ‘0’ for the Least Significant bit. For an N-bit fraction, the
binary exponent starts at ‘0’ for the Most Significant bit, and ends at (1-N) for the Least Significant
bit. This is shown in Figure 4-11 for a positive value and in Figure 4-12 for a negative value.
Converting between integer and fractional representations can be performed using simple
division and multiplication. To go from an N-bit integer to a fraction, divide the integer value by
2N-1. Likewise, to convert an N-bit fraction to an integer, multiply the fractional value by 2N-1.
Figure 4-11:
Different Representations of 0x4001
Integer:
0
1
-215 214
0
213
0
0
0
0
0
0
0
0
0
0
0
0
212 . . . . . .
1
20
0x4001 = 214 + 20 = 16384 + 1 = 16385
1.15 Fractional:
0
1
-20 . 2-1
0
2-2
0
0
0
0
0
0
0
0
0
0
0
0
2-3 . . . . . .
1
2-15
Implied Radix Point
0x4001 = 2-1 + 2-15 = 0.5 + .000030518 = 0.500030518
Figure 4-12:
Different Representations of 0xC002
4
Integer:
1
-215 214
0
213
0
0
0
0
0
0
0
0
0
0
0
1
212 . . . . . .
0
20
0xC002 = -215 + 214 + 21= -32768 + 16384 + 2 = -16382
1.15 Fractional:
1
1
-20 . 2-1
0
2-2
0
0
0
0
0
0
0
0
0
0
0
2-3 . . . . . .
1
0
2-15
Implied Radix Point
0xC002 = -20 + 2-1 + 2-14 = -1.0 + 0.5 + 0.000061035 = -0.499938965
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-31
Instruction Set
Details
1
dsPIC30F/33F Programmer’s Reference Manual
4.12
Accumulator Usage
Accumulators A and B are utilized by DSP instructions to perform mathematical and shifting
operations. Since the accumulators are 40 bits wide and the X and Y data paths are only 16 bits,
the method to load and store the accumulators must be understood.
Item A in Figure 4-13 shows that each 40-bit Accumulator (ACCA and ACCB) consists of an 8-bit
Upper register (ACCxU), a 16-bit High register (ACCxH) and a 16-bit Low register (ACCxL). To
address the bus alignment requirement and provide the ability for 1.31 math, ACCxH is used as
a destination register for loading the accumulator (with the LAC instruction), and also as a source
register for storing the accumulator (with the SAC.R instruction). This is represented by Item B,
Figure 4-13, where the upper and lower portions of the accumulator are shaded. In reality, during
accumulator loads, ACCxL is zero backfilled and ACCxU is sign-extended to represent the sign
of the value loaded in ACCxH.
When Normal (31-bit) Saturation is enabled, DSP operations (such as ADD, MAC, MSC, etc.)
utilize solely ACCxH:ACCxL (Item C in Figure 4-13) and ACCxU is only used to maintain the sign
of the value stored in ACCxH:ACCxL. For instance, when a MPY instruction is executed, the
result is stored in ACCxH:ACCxL, and the sign of the result is extended through ACCxU.
When Super Saturation is enabled, all registers of the accumulator may be used (Item D in
Figure 4-13) and the results of DSP operations are stored in ACCxU:ACCxH:ACCxL. The benefit
of ACCxU is that it increases the dynamic range of the accumulator, as described in
Section 4.11.1 “Integer and Fractional Data”. Refer to Table 4-10 to see the range of values
which may be stored in the accumulator when in Normal and Super Saturation modes.
Figure 4-13:
Accumulator Alignment and Usage
A)
39
ACCxL
ACCxH
ACCxU
.
16
32 31 30
15
0
Implied Radix Point (between bits 31 and 30)
B)
C)
D)
A)
B)
C)
D)
DS70157B-page 4-32
40-bit Accumulator consists of ACCxU:ACCxH:ACCxL
Load and Store operations
Operations in Normal Saturation mode
Operations in Super Saturation mode
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.13
Accumulator Access
The six registers of Accumulator A and Accumulator B are memory mapped like any other
Special Function Register. This feature allows them to be accessed with file register or indirect
addressing, using any instruction which supports such addressing. However, it is recommended
that the DSP instructions LAC, SAC and SAC.R be used to load and store the accumulators,
since they provide sign-extension, shifting and rounding capabilities. LAC, SAC and SAC.R
instruction details are provided in Section 5. “Instruction Descriptions”.
Note:
4.14
For convenience, ACCAU and ACCBU are sign-extended to 16 bits. This provides
the flexibility to access these registers using either Byte or Word mode (when file
register or indirect addressing is used).
DSP MAC Instructions
The DSP Multiply and Accumulate (MAC) operations are a special suite of instructions which
provide the most efficient use of the dsPIC30F and dsPIC33F architectures. The DSP MAC
instructions, shown in Table 4.14, utilize both the X and Y data paths of the CPU core, which
enables these instructions to perform the following operations all in one cycle:
• two reads from data memory using prefetch working registers (MAC Prefetches)
• two updates to prefetch working registers (MAC Prefetch Register Updates)
• one mathematical operation with an accumulator (MAC Operations)
In addition, four of the ten DSP MAC instructions are also capable of performing an operation with
one accumulator, while storing out the rounded contents of the alternate accumulator. This
feature is called accumulator Write Back (WB) and it provides flexibility for the software
developer. For instance, the accumulator WB may be used to run two algorithms concurrently, or
efficiently process complex numbers, among other things.
Table 4-11:
Instruction
Description
Accumulator WB?
CLR
Clear accumulator
Yes
ED
Euclidean distance (no accumulate)
No
EDAC
Euclidean distance
No
MAC
Multiply and accumulate
Yes
MAC
Square and accumulate
No
MOVSAC
Move from X and Y bus
Yes
MPY
Multiply to accumulator
No
MPY
Square to accumulator
No
MPY.N
Negative multiply to accumulator
No
MSC
Multiply and subtract
Yes
MAC Prefetches
Prefetches (or data reads) are made using the effective address stored in the working register.
The two prefetches from data memory must be specified using the working register assignments
shown in Table 4-9. One read must occur from the X data bus using W8 or W9, and one read
must occur from the Y data bus using W10 or W11. Allowable destination registers for both
prefetches are W4-W7.
As shown in Table 4-3, one special Addressing mode exists for the MAC class of instructions. This
mode is the Register Offset Addressing mode and utilizes W12. In this mode, the prefetch is
made using the effective address of the specified working register, plus the 16-bit signed value
stored in W12. Register Offset Addressing may only be used in the X space with W9, and in the
Y-space with W11.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-33
4
Instruction Set
Details
4.14.1
DSP MAC Instructions
dsPIC30F/33F Programmer’s Reference Manual
4.14.2
MAC Prefetch Register Updates
After the MAC prefetches are made, the effective address stored in each prefetch working register
may be modified. This feature enables efficient single-cycle processing for data stored sequentially in X and Y memory. Since all DSP instructions execute in Word mode, only even numbered
updates may be made to the effective address stored in the working register. Allowable address
modifications to each prefetch register are -6, -4, -2, 0 (no update), +2, +4 and +6. This means
that effective address updates may be made up to 3 words in either direction.
When the Register Offset Addressing mode is used, no update is made to the base prefetch
register (W9 or W11), or the offset register (W12).
4.14.3
MAC Operations
The mathematical operations performed by the MAC class of DSP instructions center around
multiplying the contents of two working registers and either adding or storing the result to either
Accumulator A or Accumulator B. This is the operation of the MAC, MPY, MPY.N and MSC instructions. Table 4-9 shows that W4-W7 must be used for data source operands in the MAC class of
instructions. W4-W7 may be combined in any fashion, and when the same working register is
specified for both operands, a square or square and accumulate operation is performed.
For the ED and EDAC instructions, the same multiplicand operand must be specified by the
instruction, because this is the definition of the Euclidean Distance operation. Another unique
feature about this instruction is that the values prefetched from X and Y memory are not actually
stored in W4-W7. Instead, only the difference of the prefetched data words is stored in W4-W7.
The two remaining MAC class instructions, CLR and MOVSAC, are useful for initiating or completing
a series of MAC or EDAC instructions and do not use the multiplier. CLR has the ability to clear
Accumulator A or B, prefetch two values from data memory and store the contents of the other
accumulator. Similarly, MOVSAC has the ability to prefetch two values from data memory and store
the contents of either accumulator.
4.14.4
MAC Write Back
The write back ability of the MAC class of DSP instructions facilitates efficient processing of
algorithms. This feature allows one mathematical operation to be performed with one
accumulator, and the rounded contents of the other accumulator to be stored in the same cycle.
As indicated in Table 4-9, register W13 is assigned for performing the write back, and two
Addressing modes are supported: Direct and Indirect with Post-Increment.
The CLR, MOVSAC and MSC instructions support accumulator Write Back, while the ED, EDAC,
MPY and MPY.N instructions do not support accumulator Write Back. The MAC instruction, which
multiplies two working registers which are not the same, also supports accumulator Write Back.
However, the square and accumulate MAC instruction does not support accumulator Write Back
(see Table 4.14).
4.14.5
MAC Syntax
The syntax of the MAC class of instructions can have several formats, which depend on the
instruction type and the operation it is performing, with respect to prefetches and accumulator
Write Back. With the exception of the CLR and MOVSAC instructions, all MAC class instructions
must specify a target accumulator along with two multiplicands, as shown in Example 4-19.
DS70157B-page 4-34
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
Example 4-19:
Base MAC Syntax
; MAC with no prefetch
MAC W4*W5, A
Multiply W4*W5, Accumulate to ACCA
; MAC with no prefetch
MAC W7*W7, B
Multiply W7*W7, Accumulate to ACCB
If a prefetch is used in the instruction, the assembler is capable of discriminating the X or Y data
prefetch based on the register used for the effective address. [W8] or [W9] specifies the X
prefetch and [W10] or [W11] specifies the Y prefetch. Brackets around the working register are
required in the syntax, and they designate that indirect addressing is used to perform the
prefetch. When address modification is used, it must be specified using a minus-equals or
plus-equals “C”-like syntax (i.e., “[W8] – = 2” or “[W8] + = 6”). When Register Offset Addressing
is used for the prefetch, W12 is placed inside the brackets ([W9 + W12] for X prefetches and
[W11 + W12] for Y prefetches). Each prefetch operation must also specify a prefetch destination
register (W4-W7). In the instruction syntax, the destination register appears before the prefetch
register. Legal forms of prefetch are shown in Example 4-20.
Example 4-20:
MAC Prefetch Syntax
; MAC with X only prefetch
MAC W5*W6, A,
[W8]+=2, W5
ACCA=ACCA+W5*W6
X([W8]+=2)→ W5
; MAC with Y only prefetch
4
MAC W5*W5, B, [W11+W12], W5
Y([W11+W12])→ W5
; MAC with X/Y prefetch
MAC W6*W7, B, [W9], W6,
[W10]+=4, W7
ACCB=ACCB+W6*W7
X([W9])→ W6
Y([W10]+=4)→ W7
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-35
Instruction Set
Details
ACCB=ACCB+W5*W5
dsPIC30F/33F Programmer’s Reference Manual
If an accumulator Write Back is used in the instruction, it is specified last. The Write Back must
use the W13 register, and allowable forms for the Write Back are “W13” for direct addressing and
“[W13] + = 2” for indirect addressing with post-increment. By definition, the accumulator not used
in the mathematical operation is stored, so the Write Back accumulator is not specified in the
instruction. Legal forms of accumulator Write Back (WB) are shown in Example 4-21.
Example 4-21:
MAC Accumulator WB Syntax
; CLR with direct WB of ACCB
CLR A,
W13
0 → ACCA
ACCB → W13
; MAC with indirect WB of ACCB
MAC W4*W5, A
[W13]+=2
ACCA=ACCA+W4*W5
ACCB → [W13]+=2
; MAC with Y prefetch, direct WB of ACCA
MAC W4*W5, B,
[W10]+=2, W4,
W13
ACCB=ACCB+W4*W5
Y([W10]+=2)→ W4
ACCA → W13
Putting it all together, an MSC instruction which performs two prefetches and a write back is
shown in Example 4-22.
Example 4-22:
MSC Instruction with Two Prefetches and Accumulator Write Back
; MSC with X/Y prefetch, indirect WB of ACCA
MSC W6*W7, B, [W8]+=2, W6, [W10]-=6, W7 [W13]+=2
ACCB=ACCB-W6*W7
X([W8]+=2)→W6
Y([W10]-=6)→W7
ACCA→[W13]+=2
DS70157B-page 4-36
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.15
DSP Accumulator Instructions
The DSP Accumulator instructions do not have prefetch or accumulator WB ability, but they do
provide the ability to add, negate, shift, load and store the contents of either 40-bit Accumulator.
In addition, the ADD and SUB instructions allow the two accumulators to be added or subtracted
from each other. DSP Accumulator instructions are shown in Table 4-12 and instruction details
are provided in Section 5. “Instruction Descriptions”.
Table 4-12:
DSP Accumulator Instructions
Instruction
4.16
Description
Accumulator WB?
ADD
Add accumulators
No
ADD
16-bit signed accumulator add
No
LAC
Load accumulator
No
NEG
Negate accumulator
No
SAC
Store accumulator
No
SAC.R
Store rounded accumulator
No
SFTAC
Arithmetic shift accumulator by Literal
No
SFTAC
Arithmetic shift accumulator by (Wn)
No
SUB
Subtract accumulators
No
Scaling Data with the FBCL Instruction
To minimize quantization errors that are associated with data processing using DSP instructions,
it is important to utilize the complete numerical result of the operations. This may require scaling
data up to avoid underflow (i.e., when processing data from a 12-bit ADC), or scaling data down
to avoid overflow (i.e., when sending data to a 10-bit DAC). The scaling, which must be
performed to minimize quantization error, depends on the dynamic range of the input data which
is operated on, and the required dynamic range of the output data. At times, these conditions
may be known beforehand and fixed scaling may be employed. In other cases, scaling conditions
may not be fixed or known, and then dynamic scaling must be used to process data.
The FBCL instruction (Find First Bit Change Left) can efficiently be used to perform dynamic
scaling, because it determines the exponent of a value. A fixed point or integer value’s exponent
represents the amount which the value may be shifted before overflowing. This information is
valuable, because it may be used to bring the data value to “full scale”, meaning that its numeric
representation utilizes all the bits of the register it is stored in.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-37
4
Instruction Set
Details
The FBCL instruction determines the exponent of a word by detecting the first bit change starting
from the value’s sign bit and working towards the LSB. Since the dsPIC DSC device’s barrel
shifter uses negative values to specify a left shift, the FBCL instruction returns the negated exponent of a value. If the value is being scaled up, this allows the ensuing shift to be performed
immediately with the value returned by FBCL. Additionally, since the FBCL instruction only operates on signed quantities, FBCL produces results in the range of -15:0. When the FBCL instruction returns ‘0’, it indicates that the value is already at full scale. When the instruction returns -15,
it indicates that the value cannot be scaled (as is the case with 0x0 and 0xFFFF). Table 4-13
shows word data with various dynamic ranges, their exponents, and the value after scaling each
data to maximize the dynamic range. Example 4-23 shows how the FBCL instruction may be
used for block processing.
dsPIC30F/33F Programmer’s Reference Manual
Table 4-13:
Scaling Examples
Exponent
Full Scale Value
(Word Value << Exponent)
0x0001
14
0x4000
0x0002
13
0x4000
0x0004
12
0x4000
0x0100
6
0x4000
0x01FF
6
0x7FC0
0x0806
3
0x4030
0x2007
1
0x400E
0x4800
0
0x4800
0x7000
0
0x7000
0x8000
0
0x8000
0x900A
0
0x900A
0xE001
2
0x8004
0xFF07
7
0x8380
Word Value
Note:
For the word values 0x0000 and 0xFFFF, the FBCL instruction returns -15.
As a practical example, assume that block processing is performed on a sequence of data with
very low dynamic range stored in 1.15 fractional format. To minimize quantization errors, the data
may be scaled up to prevent any quantization loss which may occur as it is processed. The FBCL
instruction can be executed on the sample with the largest magnitude to determine the optimal
scaling value for processing the data. Note that scaling the data up is performed by left shifting
the data. This is demonstrated with the code snippet below.
Example 4-23:
Scaling with FBCL
; assume W0 contains the largest absolute value of the data block
; assume W4 points to the beginning of the data block
; assume the block of data contains BLOCK_SIZE words
; determine the exponent to use for scaling
FBCL
W0, W2
; store exponent in W2
; scale
DO
LAC
SFTAC
SCALE:
SAC
the entire data block before processing
#(BLOCK_SIZE-1), SCALE
[W4], A
; move the next data sample to ACCA
A, W2
; shift ACCA by W2 bits
A, [W4++]
; store scaled input (overwrite original)
; now process the data
; (processing block goes here)
DS70157B-page 4-38
Preliminary
© 2005 Microchip Technology Inc.
Section 4. Instruction Set Details
4.17
Normalizing the Accumulator with the FBCL Instruction
The process of scaling a quantized value for its maximum dynamic range is known as
normalization (the data in the third column in Table 4-13 contains normalized data). Accumulator
normalization is a technique used to ensure that the accumulator is properly aligned before
storing data from the accumulator, and the FBCL instruction facilitates this function.
The two 40-bit accumulators each have 8 guard bits from the ACCxU register, which expands the
dynamic range of the accumulators from 1.31 to 9.31, when operating in Super Saturation mode
(see Section 4.11.1 “Integer and Fractional Data”). However, even in Super Saturation mode,
the Store Rounded Accumulator (SAC.R) instruction only stores 16-bit data (in 1.15 format) from
ACCxH, as described in Section 4.12 “Accumulator Usage”. Under certain conditions, this
may pose a problem.
Proper data alignment for storing the contents of the accumulator may be achieved by scaling
the accumulator down if ACCxU is in use, or scaling the accumulator up if all of the ACCxH bits
are not being used. To perform such scaling, the FBCL instruction must operate on the ACCxU
byte and it must operate on the ACCxH word. If a shift is required, the ALU’s 40-bit shifter is
employed, using the SFTAC instruction to perform the scaling. Example 4-24 contains a code
snippet for accumulator normalization.
Example 4-24:
Normalizing with FBCL
; assume an operation in ACCA has just completed (SR intact)
; assume the processor is in super saturation mode
; assume ACCAH is defined to be the address of ACCAH (0x24)
MOV
#ACCAH, W5
BRA
OA, FBCL_GUARD
FBCL_HI:
FBCL
[W5], W0
BRA
SHIFT_ACC
FBCL_GUARD:
FBCL
[++W5], W0
ADD.B
W0, #15, W0
SHIFT_ACC:
SFTAC
A, W0
; W5 points to ACCAH
; if overflow we right shift
; extract exponent for left shift
; branch to the shift
; extract exponent for right shift
; adjust the sign for right shift
; shift ACCA to normalize
4
Instruction Set
Details
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 4-39
dsPIC30F/33F Programmer’s Reference Manual
NOTES:
DS70157B-page 4-40
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
HIGHLIGHTS
This section of the manual contains the following major topics:
5.1
5.2
5.3
5.4
Instruction Symbols........................................................................................................ 5-2
Instruction Encoding Field Descriptors Introduction....................................................... 5-2
Instruction Description Example .................................................................................... 5-6
Instruction Descriptions.................................................................................................. 5-7
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-1
dsPIC30F/33F Programmer’s Reference Manual
5.1
Instruction Symbols
All symbols used in Section 5.4 “Instruction Descriptions” are shown in Table 1-2.
5.2
Instruction Encoding Field Descriptors Introduction
All instruction encoding field descriptors used in Section 5.4 “Instruction Descriptions” are
shown in Table 5-2 through Table 5-12.
Table 5-1:
Instruction Encoding Field Descriptors
Field
Description
A
aa
B
bbbb
D
dddd
f ffff ffff ffff
fff ffff ffff ffff
ffff ffff ffff ffff
ggg
hhh
kk
kkkk
kk kkkk
kk kkkk kkkk
kkkk kkkk kkkk
iiii
jjjj
k
kkkk
kkkk
kkkk
kkkk
kkkk
kkkk
mm
mmm
nnnn nnnn nnnn nnn0
nnn nnnn
nnnn nnnn nnnn nnnn
ppp
qqq
rrrr
ssss
tttt
vvvv
W
wwww
xx
xxxx xxxx xxxx xxxx
yy
z
DS70157B-page 5-2
Accumulator selection bit: 0 = ACCA; 1 = CCB
Accumulator Write Back mode (see Table 5-12)
Byte mode selection bit: 0 = word operation; 1 = byte operation
4-bit bit position select: 0000 = LSB; 1111 = MSB
Destination address bit: 0 = result stored in WREG;
1 = result stored in file register
Wd destination register select: 0000 = W0; 1111 = W15
13-bit register file address (0x0000 to 0x1FFF)
15-bit register file word address (implied 0 LSB)
(0x0000 to 0xFFFE)
16-bit register file byte address (0x0000 to 0xFFFF)
Register Offset Addressing mode for Ws source register
(see Table 5-4)
Register Offset Addressing mode for Wd destination register
(see Table 5-5)
Prefetch X Operation (see Table 5-6)
Prefetch Y Operation (see Table 5-8)
1-bit literal field, constant data or expression
4-bit literal field, constant data or expression
6-bit literal field, constant data or expression
8-bit literal field, constant data or expression
10-bit literal field, constant data or expression
14-bit literal field, constant data or expression
16-bit literal field, constant data or expression
Multiplier source select with same working registers
(see Table 5-10)
Multiplier source select with different working registers
(see Table 5-11)
23-bit program address for CALL and GOTO instructions
16-bit program offset field for relative branch/call instructions
Addressing mode for Ws source register (see Table 5-2)
Addressing mode for Wd destination register (see Table 5-3)
Barrel shift count
Ws source register select: 0000 = W0; 1111 = W15
Dividend select, most significant word
Dividend select, least significant word
Double Word mode selection bit: 0 = word operation;
1 = double word operation
Wb base register select: 0000 = W0; 1111 = W15
Prefetch X Destination (see Table 5-7)
16-bit unused field (don’t care)
Prefetch Y Destination (see Table 5-9)
Bit test destination: 0 = C flag bit; 1 = Z flag bit
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Table 5-2:
Addressing Modes for Ws Source Register
Addressing Mode
ppp
Source Operand
000
Register Direct
001
Indirect
[Ws]
010
Indirect with Post-Decrement
[Ws--]
011
Indirect with Post-Increment
[Ws++]
100
Indirect with Pre-Decrement
[--Ws]
101
Indirect with Pre-Increment
[++Ws]
11x
Unused
Table 5-3:
Ws
Addressing Modes for Wd Destination Register
Addressing Mode
qqq
Destination Operand
000
Register Direct
Wd
001
Indirect
[Wd]
010
Indirect with Post-Decrement
[Wd--]
011
Indirect with Post-Increment
[Wd++]
100
Indirect with Pre-Decrement
[--Wd]
101
Indirect with Pre-Increment
[++Wd]
11x
Unused (an attempt to use this Addressing mode will force a RESET instruction)
Table 5-4:
Offset Addressing Modes for Ws Source Register (with Register Offset)
Addressing Mode
ggg
Source Operand
000
Register Direct
Ws
001
Indirect
[Ws]
010
Indirect with Post-Decrement
[Ws--]
011
Indirect with Post-Increment
[Ws++]
100
Indirect with Pre-Decrement
[--Ws]
101
Indirect with Pre-Increment
[++Ws]
11x
Indirect with Register Offset
[Ws+Wb]
Table 5-5:
Offset Addressing Modes for Wd Destination Register
(with Register Offset)
Addressing Mode
hhh
Source Operand
000
Register Direct
Wd
001
Indirect
[Wd]
010
Indirect with Post-Decrement
[Wd--]
011
Indirect with Post-Increment
[Wd++]
100
Indirect with Pre-Decrement
[--Wd]
101
Indirect with Pre-Increment
[++Wd]
11x
Indirect with Register Offset
[Wd+Wb]
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-3
dsPIC30F/33F Programmer’s Reference Manual
Table 5-6:
X Data Space Prefetch Operation
Operation
iiii
0000
Wxd = [W8]
0001
Wxd = [W8], W8 = W8 + 2
0010
Wxd = [W8], W8 = W8 + 4
0011
Wxd = [W8], W8 = W8 + 6
0100
No Prefetch for X Data Space
0101
Wxd = [W8], W8 = W8 – 6
0110
Wxd = [W8], W8 = W8 – 4
0111
Wxd = [W8], W8 = W8 – 2
1000
Wxd = [W9]
1001
Wxd = [W9], W9 = W9 + 2
1010
Wxd = [W9], W9 = W9 + 4
1011
Wxd = [W9], W9 = W9 + 6
1100
Wxd = [W9 + W12]
1101
Wxd = [W9], W9 = W9 – 6
1110
Wxd = [W9], W9 = W9 – 4
1111
Wxd = [W9], W9 = W9 – 2
Table 5-7:
X Data Space Prefetch Destination
Wxd
xx
00
W4
01
W5
10
W6
11
W7
Table 5-8:
Y Data Space Prefetch Operation
Operation
jjjj
DS70157B-page 5-4
0000
Wyd = [W10]
0001
Wyd = [W10], W10 = W10 + 2
0010
Wyd = [W10], W10 = W10 + 4
0011
Wyd = [W10], W10 = W10 + 6
0100
No Prefetch for Y Data Space
0101
Wyd = [W10], W10 = W10 – 6
0110
Wyd = [W10], W10 = W10 – 4
0111
Wyd = [W10], W10 = W10 – 2
1000
Wyd = [W11]
1001
Wyd = [W11], W11 = W11 + 2
1010
Wyd = [W11], W11 = W11 + 4
1011
Wyd = [W11], W11 = W11 + 6
1100
Wyd = [W11 + W12]
1101
Wyd = [W11], W11 = W11 – 6
1110
Wyd = [W11], W11 = W11 – 4
1111
Wyd = [W11], W11 = W11 – 2
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Table 5-9:
Y Data Space Prefetch Destination
Wyd
yy
00
W4
01
W5
10
W6
11
W7
Table 5-10: MAC or MPY Source Operands (Same Working Register)
Multiplicands
mm
00
W4 * W4
01
W5 * W5
10
W6 * W6
11
W7 * W7
Table 5-11:
MAC or MPY Source Operands (Different Working Register)
Multiplicands
mmm
000
W4 * W5
001
W4 * W6
010
W4 * W7
011
Invalid
100
W5 * W6
101
W5 * W7
110
W6 * W7
111
Invalid
Table 5-12:
MAC Accumulator Write Back Selection
Write Back Selection
aa
00
W13 = Other Accumulator (Direct Addressing)
01
[W13] + = 2 = Other Accumulator (Indirect Addressing with Post-Increment)
10
No Write Back
11
Invalid
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-5
dsPIC30F/33F Programmer’s Reference Manual
5.3
Instruction Description Example
The example description below is for the fictitious instruction FOO. The following example
instruction was created to demonstrate how the table fields (syntax, operands, operation, etc.)
are used to describe the instructions presented in Section 5.4 “Instruction Descriptions”.
FOO
DS70157B-page 5-6
The Header field summarizes what the instruction does
Syntax:
The Syntax field consists of an optional label, the instruction mnemonic, any
optional extensions which exist for the instruction and the operands for the
instruction. Most instructions support more than one operand variant to
support the various dsPIC30F/dsPIC33F Addressing modes. In these circumstances, all possible instruction operands are listed beneath each other
(as in the case of op2a, op2b and op2c above). Optional operands are
enclosed in braces.
Operands:
The Operands field describes the set of values which each of the operands
may take. Operands may be accumulator registers, file registers, literal
constants (signed or unsigned), or working registers.
Operation:
The Operation field summarizes the operation performed by the instruction.
Status Affected:
The Status Affected field describes which bits of the STATUS Register are
affected by the instruction. Status bits are listed by bit position in
descending order.
Encoding:
The Encoding field shows how the instruction is bit encoded. Individual bit
fields are explained in the Description field, and complete encoding details
are provided in Table 5.2.
Description:
The Description field describes in detail the operation performed by the
instruction. A key for the encoding bits is also provided.
Words:
The Words field contains the number of program words that are used to
store the instruction in memory.
Cycles:
The Cycles field contains the number of instruction cycles that are required
to execute the instruction.
Examples:
The Examples field contains examples which demonstrate how the
instruction operates. “Before” and “After” register snapshots are provided,
which allow the user to clearly understand what operation the instruction
performs.
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
5.4
Instruction Descriptions
ADD
Add f to WREG
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) + (WREG) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
ADD{.B}
1011
f
0100
{,WREG}
0BDf
ffff
ffff
ffff
Add the contents of the default working register WREG to the contents of
the file register and place the result in the destination register. The
optional WREG operand determines the destination register. If WREG is
specified, the result is stored in WREG. If WREG is not specified, the
result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
ADD.B
RAM100
Before
Instruction
WREG CC80
RAM100 FFC0
SR
0000
Example 2:
ADD
; Add WREG to RAM100 (Byte mode)
After
Instruction
WREG CC80
RAM100 FF40
SR
0005 (OV, C = 1)
RAM200, WREG
Before
Instruction
WREG CC80
RAM200 FFC0
SR 0000
; Add RAM200 to WREG (Word mode)
After
Instruction
WREG CC40
RAM200 FFC0
SR 0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-7
dsPIC30F/33F Programmer’s Reference Manual
ADD
Add Literal to Wn
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
lit10 + (Wn) → Wn
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
ADD{.B}
1011
0000
#lit10,
Wn
0Bkk
kkkk
kkkk
dddd
Add the 10-bit unsigned literal operand to the contents of the working
register Wn and place the result back into the working register Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an unsigned
value [0:255]. See Section 4.6 “Using 10-bit Literal Operands”
for information on using 10-bit literal operands in Byte mode.
Words:
1
Cycles:
1
Example 1:
ADD.B
#0xFF, W7
Before
Instruction
W7 12C0
SR
0000
Example 2:
ADD
After
Instruction
W7 12BF
SR 0009 (N, C = 1)
#0xFF, W1
Before
Instruction
W1 12C0
SR
0000
DS70157B-page 5-8
; Add -1 to W7 (Byte mode)
Preliminary
; Add 255 to W1 (Word mode)
After
Instruction
W1 13BF
SR 0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ADD
Add Wb to Short Literal
Syntax:
{label:}
ADD{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb) + lit5 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0100
Description:
0www
wBqq
qddd
d11k
kkkk
Add the contents of the base register Wb to the 5-bit unsigned short literal
operand and place the result in the destination register Wd. Register
direct addressing must be used for Wb. Either register direct or indirect
addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
ADD.B
W0, #0x1F, W7
Before
Instruction
W0
2290
W7 12C0
SR
0000
Example 2:
ADD
; Add W3 and 6 (Word mode)
; Store the result in [--W4]
After
Instruction
W3 6006
W4 0FFE
Data 0FFE 600C
Data 1000 DDEE
SR 0000
Preliminary
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
After
Instruction
W0 2290
W7 12AF
SR 0008 (N = 1)
W3, #0x6, [--W4]
Before
Instruction
W3
6006
W4
1000
Data 0FFE DDEE
Data 1000 DDEE
SR
0000
; Add W0 and 31 (Byte mode)
; Store the result in W7
DS70157B-page 5-9
dsPIC30F/33F Programmer’s Reference Manual
ADD
Add Wb to Ws
Syntax:
{label:}
ADD{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb) + (Ws) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0100
Description:
Wb,
0www
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Add the contents of the source register Ws and the contents of the base
register Wb and place the result in the destination register Wd. Register
direct addressing must be used for Wb. Either register direct or indirect
addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
ADD.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W5, W6, W7
Before
Instruction
W5
AB00
W6
0030
W7
FFFF
SR
0000
Example 2:
ADD
DS70157B-page 5-10
After
Instruction
W5
AB00
W6
0030
W7
FF30
SR
0000
W5, W6, W7
Before
Instruction
W5
AB00
W6
0030
W7
FFFF
SR
0000
; Add W5 to W6, store result in W7
; (Byte mode)
; Add W5 to W6, store result in W7
; (Word mode)
After
Instruction
W5
AB00
W6
0030
W7
AB30
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ADD
Add Accumulators
Syntax:
{label:}
Operands:
Acc ∈ [A,B]
Operation:
If (Acc = A):
(ACCA) + (ACCB) → ACCA
Else:
(ACCA) + (ACCB) → ACCB
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
ADD
1100
Description:
1011
Acc
A000
0000
0000
0000
Add the contents of Accumulator A to the contents of Accumulator B and
place the result in the selected accumulator. This instruction performs a
40-bit addition.
The ‘A’ bit specifies the destination accumulator.
Words:
1
Cycles:
1
Example 1:
ADD
ACCA
ACCB
SR
Example 2:
ADD
ACCA
ACCB
SR
A
Before
Instruction
00 0022 3300
00 1833 4558
0000
B
Before
Instruction
00 E111 2222
00 7654 3210
0000
; Add ACCB to ACCA
ACCA
ACCB
SR
After
Instruction
00 1855 7858
00 1833 4558
0000
; Add ACCA to ACCB
; Assume Super Saturation mode enabled
; (ACCSAT = 1, SATA = 1, SATB = 1)
ACCA
ACCB
SR
After
Instruction
00 E111 2222
01 5765 5432
4800 (OB, OAB = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-11
dsPIC30F/33F Programmer’s Reference Manual
ADD
Syntax:
16-Bit Signed Add to Accumulator
{label:}
ADD
Ws,
{#Slit4,}
Acc
[Ws],
[Ws++],
[Ws--],
[--Ws],
[++Ws],
[Ws+Wb],
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Slit4 ∈ [-8 ... +7]
Acc ∈ [A,B]
Operation:
ShiftSlit4(Extend(Ws)) + (Acc) → Acc
Status Affected: OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1100
1001
Awww
wrrr
rggg
ssss
Add a 16-bit value specified by the source working register to the most significant word of the selected accumulator. The source operand may specify the
direct contents of a working register or an effective address. The value
specified is added to the most significant word of the accumulator by
sign-extending and zero backfilling the source operand prior to the operation.
The value added to the accumulator may also be shifted by a 4-bit signed
literal before the addition is made.
The ‘A’ bit specifies the destination accumulator.
The ‘w’ bits specify the offset register Wb.
The ‘r’ bits encode the optional shift.
The ‘g’ bits select the source Address mode.
The ‘s’ bits specify the source register Ws.
Note:
Words:
1
Cycles:
1
Example 1:
ADD
W0
ACCA
SR
DS70157B-page 5-12
Positive values of operand Slit4 represent an arithmetic shift right
and negative values of operand Slit4 represent an arithmetic shift
left. The contents of the source register are not affected by Slit4.
W0, #2, A
Before
Instruction
8000
00 7000 0000
0000
Preliminary
; Add W0 right-shifted by 2 to ACCA
W0
ACCA
SR
After
Instruction
8000
00 5000 0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
ADD
W5
ACCA
Data 2000
SR
[W5++], A
; Add the effective value of W5 to ACCA
; Post-increment W5
Before
Instruction
2000
00 0067 2345
5000
0000
W5
ACCA
Data 2000
SR
After
Instruction
2002
00 5067 2345
5000
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-13
dsPIC30F/33F Programmer’s Reference Manual
ADDC
Add f to WREG with Carry
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) + (WREG) + (C) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1011
ADDC{.B} f
0100
{,WREG}
1BDf
ffff
ffff
ffff
Add the contents of the default working register WREG, the contents of
the file register and the Carry bit and place the result in the destination
register. The optional WREG operand determines the destination
register. If WREG is specified, the result is stored in WREG. If WREG is
not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
ADDC.B
RAM100
; Add WREG and C bit to RAM100
; (Byte mode)
Before
After
Instruction
Instruction
WREG CC60
WREG CC60
RAM100
8006
RAM100 8067
SR
0001 (C=1)
SR 0000
Example 2:
ADDC
RAM200, WREG
; Add RAM200 and C bit to the WREG
; (Word mode)
Before
After
Instruction
Instruction
WREG
5600
WREG 8A01
RAM200
3400
RAM200 3400
SR
0001 (C=1)
SR 000C (N, OV = 1)
DS70157B-page 5-14
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ADDC
Add Literal to Wn with Carry
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
lit10 + (Wn) + (C) → Wn
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1011
ADDC{.B}
0000
#lit10,
1Bkk
Wn
kkkk
kkkk
dddd
Add the 10-bit unsigned literal operand, the contents of the working
register Wn and the Carry bit and place the result back into the working
register Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an
unsigned value [0:255]. See Section 4.6 “Using 10-bit Literal
Operands” for information on using 10-bit literal operands in
Byte mode.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR. These
instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
ADDC.B
#0xFF, W7
Before
Instruction
W7 12C0
SR
0000 (C = 0)
Example 2:
ADDC
; Add -1 and C bit to W7 (Byte mode)
After
Instruction
W7 12BF
SR
0009 (N,C = 1)
#0xFF, W1
Before
Instruction
W1 12C0
SR
0001 (C = 1)
; Add 255 and C bit to W1 (Word mode)
After
Instruction
W1 13C0
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-15
dsPIC30F/33F Programmer’s Reference Manual
ADDC
Syntax:
Add Wb to Short Literal with Carry
{label:}
ADDC{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb) + lit5 + (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
0100
1www
wBqq
qddd
d11k
kkkk
Add the contents of the base register Wb, the 5-bit unsigned short literal
operand and the Carry bit and place the result in the destination register
Wd. Register direct addressing must be used for Wb. Register direct or
indirect addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR. These
instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
ADDC.B
W0, #0x1F, [W7]
Before
Instruction
W0 CC80
W7
12C0
Data 12C0
B000
SR
0000 (C = 0)
Example 2:
ADDC
After
Instruction
W0 CC80
W7 12C0
Data 12C0 B09F
SR
0008 (N = 1)
W3, #0x6, [--W4] ; Add W3, 6 and C bit (Word mode)
; Store the result in [--W4]
Before
Instruction
W3 6006
W4 1000
Data 0FFE DDEE
Data 1000 DDEE
SR 0001 (C = 1)
DS70157B-page 5-16
; Add W0, 31 and C bit (Byte mode)
; Store the result in [W7]
After
Instruction
W3
6006
W4
0FFE
Data 0FFE
600D
Data 1000
DDEE
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ADDC
Add Wb to Ws with Carry
Syntax:
{label:}
ADDC{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb) + (Ws) + (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
0100
Wb,
1www
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Add the contents of the source register Ws, the contents of the base
register Wb and the Carry bit and place the result in the destination
register Wd. Register direct addressing must be used for Wb. Either
register direct or indirect addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
ADDC.B
W0,[W1++],[W2++]
; Add W0, [W1] and C bit (Byte mode)
; Store the result in [W2]
; Post-increment W1, W2
Before
After
Instruction
Instruction
W0 CC20
W0 CC20
W1 0800
W1
0801
W2 1000
W2
1001
Data 0800 AB25
Data 0800 AB25
Data 1000 FFFF
Data 1000 FF46
SR 0001 (C = 1)
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-17
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
ADDC
W3,[W2++],[W1++]
; Add W3, [W2] and C bit (Word mode)
; Store the result in [W1]
; Post-increment W1, W2
Before
After
Instruction
Instruction
W1 1000
W1
1002
W2 2000
W2
2002
W3 0180
W3
0180
Data 1000 8000
Data 1000
2681
Data 2000 2500
Data 2000
2500
SR 0001 (C = 1)
SR
0000
DS70157B-page 5-18
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
AND
AND f and WREG
Syntax:
{label:}
AND{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f).AND.(WREG) → destination designated by D
Status Affected:
N, Z
Encoding:
1011
Description:
0110
0BDf
ffff
ffff
ffff
Compute the logical AND operation of the contents of the default working
register WREG and the contents of the file register and place the result in
the destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG.
If WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
AND.B
RAM100
Before
Instruction
WREG CC80
RAM100 FFC0
SR
0000
Example 2:
AND
; AND WREG to RAM100 (Byte mode)
After
Instruction
WREG CC80
RAM100 FF80
SR 0008 (N = 1)
RAM200, WREG
Before
Instruction
WREG CC80
RAM200 12C0
SR
0000
; AND RAM200 to WREG (Word mode)
After
Instruction
WREG 0080
RAM200 12C0
SR 0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-19
dsPIC30F/33F Programmer’s Reference Manual
AND
AND Literal and Wd
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
lit10.AND.(Wn) → Wn
Status Affected:
N, Z
Encoding:
Description:
AND{.B}
1011
0010
#lit10,
0Bkk
Wn
kkkk
kkkk
dddd
Compute the logical AND operation of the 10-bit literal operand and the
contents of the working register Wn and place the result back into the
working register Wn. Register direct addressing must be used for Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an
unsigned value [0:255]. See Section 4.6 “Using 10-bit Literal
Operands” for information on using 10-bit literal operands in
Byte mode.
Words:
1
Cycles:
1
Example 1:
AND.B
#0x83, W7
Before
Instruction
W7 12C0
SR
0000
Example 2:
AND
#0x333, W1
Before
Instruction
W1 12D0
SR
0000
DS70157B-page 5-20
Preliminary
; AND 0x83 to W7 (Byte mode)
After
Instruction
W7
1280
SR
0008 (N = 1)
; AND 0x333 to W1 (Word mode)
After
Instruction
W1
0210
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
AND
AND Wb and Short Literal
Syntax:
{label:}
AND{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb).AND.lit5 → Wd
Status Affected:
N, Z
Encoding:
0110
Description:
0www
wBqq
qddd
d11k
kkkk
Compute the logical AND operation of the contents of the base register
Wb and the 5-bit literal and place the result in the destination register Wd.
Register direct addressing must be used for Wb. Either register direct or
indirect addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
AND.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0,#0x3,[W1++]
Before
Instruction
W0 23A5
W1
2211
Data 2210
9999
SR
0000
Example 2:
AND
After
Instruction
W0 23A5
W1
2212
Data 2210
0199
SR
0000
W0,#0x1F,W1
Preliminary
; AND W0 and 0x1F (Word mode)
; Store to W1
After
Instruction
W0
6723
W1
0003
SR
0000
5
Instruction
Descriptions
Before
Instruction
W0
6723
W1
7878
SR
0000
© 2005 Microchip Technology Inc.
; AND W0 and 0x3 (Byte mode)
; Store to [W1]
; Post-increment W1
DS70157B-page 5-21
dsPIC30F/33F Programmer’s Reference Manual
AND
And Wb and Ws
Syntax:
{label:}
AND{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb).AND.(Ws) → Wd
Status Affected:
N, Z
Encoding:
0110
Description:
0www
Wb,
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Compute the logical AND operation of the contents of the source register
Ws and the contents of the base register Wb and place the result in the
destination register Wd. Register direct addressing must be used for Wb.
Either register direct or indirect addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
AND.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W1 [W2++] ; AND W0 and W1, and
; store to [W2] (Byte mode)
; Post-increment W2
Before
Instruction
W0 AA55
W1
2211
W2
1001
Data 1000 FFFF
SR
0000
DS70157B-page 5-22
After
Instruction
W0 AA55
W1
2211
W2
1002
Data 1000
11FF
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
AND
W0, [W1++], W2
Before
Instruction
W0
AA55
W1
1000
W2
55AA
Data 1000
2634
SR
0000
; AND W0 and [W1], and
; store to W2 (Word mode)
; Post-increment W1
After
Instruction
W0
AA55
W1
1002
W2
2214
Data 1000
2634
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-23
dsPIC30F/33F Programmer’s Reference Manual
ASR
Arithmetic Shift Right f
Syntax:
{label:}
ASR{.B}
f
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(f<7>) → Dest<7>
(f<7>) → Dest<6>
(f<6:1>) → Dest<5:0>
(f<0>) → C
For word operation:
(f<15>) → Dest<15>
(f<15>) → Dest<14>
(f<14:1>) → Dest<13:0>
(f<0>) → C
{,WREG}
C
Status Affected:
N, Z, C
Encoding:
1101
Description:
0101
1BDf
ffff
ffff
ffff
Shift the contents of the file register one bit to the right and place the
result in the destination register. The Least Significant bit of the file
register is shifted into the Carry bit of the STATUS Register. After the shift
is performed, the result is sign-extended. The optional WREG operand
determines the destination register. If WREG is specified, the result is
stored in WREG. If WREG is not specified, the result is stored in the file
register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ’1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
ASR.B
RAM400, WREG
Before
Instruction
WREG
0600
RAM400
0823
SR
0000
Example 2:
ASR
DS70157B-page 5-24
After
Instruction
WREG
0611
RAM400
0823
SR
0001 (C = 1)
RAM200
Before
Instruction
RAM200
8009
SR
0000
; ASR RAM400 and store to WREG
; (Byte mode)
; ASR RAM200 (Word mode)
After
Instruction
RAM200 C004
SR
0009 (N, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ASR
Syntax:
Arithmetic Shift Right Ws
{label:}
ASR{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(Ws<7>) → Wd<7>
(Ws<7>) → Wd<6>
(Ws<6:1>) → Wd<5:0>
(Ws<0>) → C
For word operation:
(Ws<15>) → Wd<15>
(Ws<15>) → Wd<14>
(Ws<14:1>) → Wd<13:0>
(Ws<0>) → C
C
Status Affected:
N, Z, C
Encoding:
Description:
1101
0001
1Bqq
qddd
dppp
ssss
Shift the contents of the source register Ws one bit to the right and place
the result in the destination register Wd. The Least Significant bit of Ws is
shifted into the Carry bit of the STATUS register. After the shift is performed, the result is sign-extended. Either register direct or indirect
addressing may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-25
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
ASR.B
[W0++], [W1++]
Before
Instruction
W0
0600
W1
0801
Data 600
2366
Data 800
FFC0
SR
0000
Example 2:
ASR
After
Instruction
W0
0601
W1
0802
Data 600
2366
Data 800
33C0
SR
0000
W12, W13
Before
Instruction
W12 AB01
W13
0322
SR
0000
DS70157B-page 5-26
; ASR [W0] and store to [W1] (Byte mode)
; Post-increment W0 and W1
; ASR W12 and store to W13 (Word mode)
After
Instruction
W12 AB01
W13 D580
SR
0009 (N, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ASR
Arithmetic Shift Right by Short Literal
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit4 ∈ [0...15]
Wnd ∈ [W0 ... W15]
Operation:
lit4<3:0> → Shift_Val
Wb<15> → Wnd<15:15-Shift_Val + 1>
Wb<15:Shift_Val> → Wnd<15-Shift_Val:0>
Status Affected:
N, Z
Encoding:
ASR
1101
Description:
Wb,
1110
1www
#lit4,
wddd
Wnd
d100
kkkk
Arithmetic shift right the contents of the source register Wb by the 4-bit
unsigned literal and store the result in the destination register Wnd. After
the shift is performed, the result is sign-extended. Direct addressing must
be used for Wb and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand.
Note:
Words:
1
Cycles:
1
Example 1:
ASR
This instruction operates in Word mode only.
W0, #0x4, W1
; ASR W0 by 4 and store to W1
Before
Instruction
W0
060F
W1
1234
SR
0000
Example 2:
ASR
W0, #0x6, W1
Before
Instruction
W0
80FF
W1
0060
SR
0000
Example 3:
ASR
After
Instruction
W0 060F
W1
0060
SR
0000
; ASR W0 by 6 and store to W1
After
Instruction
W0 80FF
W1 FE03
SR
0008 (N = 1)
W0, #0xF, W1
© 2005 Microchip Technology Inc.
Preliminary
After
Instruction
W0
70FF
W1
0000
SR
0002 (Z = 1)
5
Instruction
Descriptions
Before
Instruction
W0
70FF
W1 CC26
SR
0000
; ASR W0 by 15 and store to W1
DS70157B-page 5-27
dsPIC30F/33F Programmer’s Reference Manual
ASR
Arithmetic Shift Right by Wns
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wns ∈ [W0 ...W15]
Wnd ∈ [W0 ... W15]
Operation:
Wns<3:0> → Shift_Val
Wb<15> → Wnd<15:15-Shift_Val + 1>
Wb<15:Shift_Val> → Wnd<15-Shift_Val:0>
Status Affected:
N, Z
Encoding:
Description:
ASR
1101
Wb,
1110
Wns,
1www
Wnd
wddd
d000
ssss
Arithmetic shift right the contents of the source register Wb by the 4 Least
Significant bits of Wns (up to 15 positions) and store the result in the
destination register Wnd. After the shift is performed, the result is
sign-extended. Direct addressing must be used for Wb, Wns and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: If Wns is greater than 15, Wnd = 0x0 if Wb is positive, and
Wnd = 0xFFFF if Wb is negative.
Words:
1
Cycles:
1
Example 1:
ASR
W0, W5, W6
Before
Instruction
W0
80FF
W5
0004
W6
2633
SR
0000
Example 2:
ASR
; ASR W0 by W5 and store to W6
After
Instruction
W0
80FF
W5
0004
W6
F80F
SR
0000
W0, W5, W6
; ASR W0 by W5 and store to W6
Before
Instruction
W0
6688
W5
000A
W6
FF00
SR
0000
Example 3:
ASR
W11, W12, W13
Before
Instruction
W11
8765
W12
88E4
W13
A5A5
SR
0000
DS70157B-page 5-28
After
Instruction
W0
6688
W5
000A
W6
0019
SR
0000
; ASR W11 by W12 and store to W13
After
Instruction
W11
8765
W12
88E4
W13
F876
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BCLR
Bit Clear f
Syntax:
{label:}
BCLR{.B}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for byte operation
Operation:
0 → f<bit4>
Status Affected:
None
Encoding:
1010
Description:
1001
f,
#bit4
bbbf
ffff
ffff
fffb
Clear the bit in the file register f specified by ‘bit4’. Bit numbering begins
with the Least Significant bit (bit 0) and advances to the Most Significant
bit (bit 7 for byte operations, bit 15 for word operations).
The ‘b’ bits select value bit4 of the bit position to be cleared.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BCLR.B 0x800, #0x7
Before
Instruction
Data 0800
66EF
SR
0000
Example 2:
BCLR
After
Instruction
Data 0800
666F
SR
0000
0x400, #0x9
Before
Instruction
Data 0400
AA55
SR
0000
; Clear bit 7 in 0x800
; Clear bit 9 in 0x400
After
Instruction
Data 0400
A855
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-29
dsPIC30F/33F Programmer’s Reference Manual
BCLR
Syntax:
Bit Clear in Ws
{label:}
BCLR{.B}
Ws,
#bit4
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
0 → Ws<bit4>
Status Affected:
None
Encoding:
1010
Description:
0001
bbbb
0B00
0ppp
ssss
Clear the bit in register Ws specified by ‘bit4’. Bit numbering begins with
the Least Significant bit (bit 0) and advances to the Most Significant bit
(bit 7 for byte operations, bit 15 for word operations). Register direct or
indirect addressing may be used for Ws.
The ‘b’ bits select value bit4 of the bit position to be cleared.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the source/destination register.
The ‘p’ bits select the source Address mode.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the source
register address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BCLR.B
W2, #0x2
Before
Instruction
W2
F234
SR
0000
Example 2:
BCLR
DS70157B-page 5-30
After
Instruction
W2
F230
SR
0000
[W0++], #0x0
Before
Instruction
W0
2300
Data 2300
5607
SR
0000
; Clear bit 3 in W2
; Clear bit 0 in [W0]
; Post-increment W0
After
Instruction
W0
2302
Data 2300
5606
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA
Branch Unconditionally
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where Slit16 ∈ [-32768 ... +32767].
Operation:
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
Description:
BRA
0011
Expr
0111
nnnn
nnnn
nnnn
nnnn
The program will branch unconditionally, relative to the next PC. The offset
of the branch is the two’s complement number ‘2 * Slit16’, which supports
branches up to 32K instructions forward or backward. The Slit16 value is
resolved by the linker from the supplied label, absolute address or
expression. After the branch is taken, the new address will be (PC + 2) + 2 *
Slit16, since the PC will have incremented to fetch the next instruction.
The ‘n’ bits are a signed literal that specifies the number of program words
offset from (PC + 2).
Words:
1
Cycles:
2
Example 1:
002000 HERE:
002002
002004
002006
002008
00200A THERE:
00200C
PC
SR
Example 2:
Example 3:
BRA
. .
. .
. .
. .
. .
. .
THERE+0x2
.
.
.
.
.
.
; Branch to THERE+0x2
After
Instruction
PC
00 200C
SR
0000
BRA 0x1366
. . .
. . .
Before
Instruction
00 2000
0000
Preliminary
5
; Branch to 0x1366
Instruction
Descriptions
© 2005 Microchip Technology Inc.
; Branch to THERE
After
Instruction
PC
00 200A
SR
0000
Before
Instruction
00 2000
0000
002000 HERE:
002002
002004
PC
SR
THERE
.
.
.
.
.
.
Before
Instruction
00 2000
0000
002000 HERE:
002002
002004
002006
002008
00200A THERE:
00200C
PC
SR
BRA
. .
. .
. .
. .
. .
. .
After
Instruction
PC
00 1366
SR
0000
DS70157B-page 5-31
dsPIC30F/33F Programmer’s Reference Manual
BRA
Computed Branch
Syntax:
{label:}
Operands:
Wn ∈ [W0 ... W15]
Operation:
(PC + 2) + (2 * Wn) → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0000
Description:
Wn
0001
0110
0000
0000
ssss
The program will branch unconditionally, relative to the next PC. The
offset of the branch is the sign-extended 17-bit value (2 * Wn), which
supports branches up to 32K instructions forward or backward. After this
instruction executes, the new PC will be (PC + 2) + 2 * Wn, since the PC
will have incremented to fetch the next instruction.
The ‘s’ bits select the source register.
Words:
1
Cycles:
2
Example 1:
002000 HERE:
002002
...
...
002108
00210A TABLE7:
00210C
PC
W7
SR
DS70157B-page 5-32
BRA
. .
. .
. .
. .
. .
. .
W7
.
.
.
.
.
.
Before
Instruction
00 2000
0084
0000
Preliminary
; Branch forward (2+2*W7)
After
Instruction
PC
00 2108
W7
0084
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA C
Branch if Carry
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = C
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
C,
0001
Expr
nnnn
nnnn
nnnn
nnnn
If the Carry flag bit is ‘1’, then the program will branch relative to the next PC.
The offset of the branch is the two’s complement number ‘2 * Slit16’, which
supports branches up to 32K instructions forward or backward. The Slit16
value is resolved by the linker from the supplied label, absolute address or
expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since the
PC will have incremented to fetch the next instruction. The instruction then
becomes a two-cycle instruction, with a NOP executed in the second cycle.
The ‘n’ bits are a 16-bit signed literal that specify the offset from (PC + 2) in
instruction words.
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000
002002
002004
002006
002008
00200A
00200C
00200E
PC
SR
Example 2:
THERE:
HERE:
NO_C:
CARRY:
THERE:
PC
SR
BRA C, CARRY
...
...
GOTO THERE
...
...
...
...
Before
Instruction
00 2000
0000
Preliminary
PC
SR
; If C is set, branch to CARRY
; Otherwise... continue
After
Instruction
00 2008
0001 (C = 1)
; If C is set, branch to CARRY
; Otherwise... continue
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
CARRY:
BRA C, CARRY
. . .
. . .
GOTO THERE
. . .
. . .
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
002000
002002
002004
002006
002008
00200A
00200C
00200E
PC
SR
HERE:
NO_C:
After
Instruction
00 2002
0000
DS70157B-page 5-33
dsPIC30F/33F Programmer’s Reference Manual
Example 3:
006230
006232
006234
006236
006238
00623A
00623C
00623E
PC
SR
Example 4:
CARRY:
THERE:
BRA C, CARRY
...
...
GOTO THERE
...
...
...
...
Before
Instruction
00 6230
0001 (C = 1)
006230 START:
006232
006234 CARRY:
006236
006238
00623A
00623C HERE:
00623E
PC
SR
DS70157B-page 5-34
HERE:
NO_C:
PC
SR
...
...
...
...
...
...
BRA C, CARRY
...
Before
Instruction
00 623C
0001 (C = 1)
Preliminary
PC
SR
; If C is set, branch to CARRY
; Otherwise... continue
After
Instruction
00 6238
0001 (C = 1)
; If C is set, branch to CARRY
; Otherwise... continue
After
Instruction
00 6234
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA GE
Branch if Signed Greater Than or Equal
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = (N&&OV)||(!N&&!OV)
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0011
Description:
BRA
GE,
1101
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression (N&&OV)||(!N&&!OV) is true, then the program
will branch relative to the next PC. The offset of the branch is the two’s
complement number ‘2 * Slit16’, which supports branches up to 32K
instructions forward or backward. The Slit16 value is resolved by the
linker from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a 16-bit signed literal that specify the offset from (PC + 2)
in instruction words.
Note:
The assembler will convert the specified label into the offset to
be used.
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
007600 LOOP:
007602
007604
007606
007608 HERE:
00760A NO_GE:
PC
SR
Example 2:
; If GE, branch to LOOP
; Otherwise... continue
After
Instruction
PC
00 7600
SR
0000
. .
. .
. .
. .
BRA
. .
.
.
.
.
GE, LOOP
.
Before
Instruction
00 7608
0008 (N = 1)
Preliminary
; If GE, branch to LOOP
; Otherwise... continue
After
Instruction
PC
00 760A
SR
0008 (N = 1)
DS70157B-page 5-35
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
.
.
.
.
GE, LOOP
.
Before
Instruction
00 7608
0000
007600 LOOP:
007602
007604
007606
007608 HERE:
00760A NO_GE:
PC
SR
. .
. .
. .
. .
BRA
. .
dsPIC30F/33F Programmer’s Reference Manual
BRA GEU
Branch if Unsigned Greater Than or Equal
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16 offset that supports an offset
range of [-32768 ... +32767] program words.
Operation:
Condition = C
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0011
Description:
BRA
0001
GEU,
nnnn
Expr
nnnn
nnnn
nnnn
If the Carry flag is ‘1’, then the program will branch relative to the next
PC. The offset of the branch is the two’s complement number ‘2 *
Slit16’, which supports branches up to 32K instructions forward or
backward. The Slit16 value is resolved by the linker from the supplied
label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16,
since the PC will have incremented to fetch the next instruction. The
instruction then becomes a two-cycle instruction, with a NOP executed
in the second cycle.
The ‘n’ bits are a 16-bit signed literal that specify the offset from
(PC + 2) in instruction words.
Note:
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_GEU:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-36
This instruction is identical to the BRA C, Expr (Branch if
Carry) instruction and has the same encoding. It will reverse
assemble as BRA C, Slit16.
BRA GEU, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
Preliminary
PC
SR
; If C is set, branch
; to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA GT
Branch if Signed Greater Than
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = (!Z&&N&&OV)||(!Z&&!N&&!OV)
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
GT,
1100
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression (!Z&&N&&OV)||(!Z&&!N&&!OV) is true, then the
program will branch relative to the next PC. The offset of the branch is the
two’s complement number ‘2 * Slit16’, which supports branches up to 32K
instructions forward or backward. The Slit16 value is resolved by the
linker from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a 16-bit signed literal that specify the offset from (PC + 2)
in instruction words.
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_GT:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA GT, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
; If GT, branch to BYPASS
; Otherwise... continue
After
Instruction
PC
00 200C
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-37
dsPIC30F/33F Programmer’s Reference Manual
BRA GTU
Branch if Unsigned Greater Than
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = (C&&!Z)
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0011
Description:
BRA
1110
GTU,
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression (C&&!Z) is true, then the program will branch
relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions forward or backward. The Slit16 value is resolved by the linker from the
supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_GTU:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-38
BRA GTU, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
Preliminary
PC
SR
; If GTU, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA LE
Branch if Signed Less Than or Equal
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = Z||(N&&!OV)||(!N&&OV)
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
0100
LE,
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression (Z||(N&&!OV)||(!N&&OV)) is true, then the
program will branch relative to the next PC. The offset of the branch is the
two’s complement number ‘2 * Slit16’, which supports branches up to 32K
instructions forward or backward. The Slit16 value is resolved by the linker
from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_LE:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA LE, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
PC
SR
; If LE, branch to
BYPASS
; Otherwise... continue
After
Instruction
00 2002
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-39
dsPIC30F/33F Programmer’s Reference Manual
BRA LEU
Branch if Unsigned Less Than or Equal
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !C||Z
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
0110
LEU,
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression (!C||Z) is true, then the program will branch
relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions forward or backward. The Slit16 value is resolved by the linker from the
supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_LEU:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-40
BRA LEU, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
Preliminary
PC
SR
; If LEU, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA LT
Branch if Signed Less Than
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = (N&&!OV)||(!N&&OV)
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
LT,
0101
Expr
nnnn
nnnn
nnnn
nnnn
If the logical expression ( (N&&!OV)||(!N&&OV) ) is true, then the program
will branch relative to the next PC. The offset of the branch is the two’s
complement number ‘2 * Slit16’, which supports branches up to 32K
instructions forward or backward. The Slit16 value is resolved by the
linker from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_LT:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA LT, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
; If LT, branch to BYPASS
; Otherwise... continue
After
Instruction
PC
00 2002
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-41
dsPIC30F/33F Programmer’s Reference Manual
BRA LTU
Branch if Unsigned Less Than
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !C
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
1001
LTU,
Expr
nnnn
nnnn
nnnn
nnnn
If the Carry flag is ‘0’, then the program will branch relative to the next PC.
The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Note:
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_LTU:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-42
This instruction is identical to the BRA NC, Expr (Branch if Not
Carry) instruction and has the same encoding. It will reverse
assemble as BRA NC, Slit16.
BRA LTU, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
Preliminary
PC
SR
; If LTU, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA N
Branch if Negative
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = N
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register.
Status Affected:
None
Encoding:
BRA
0011
Description:
0011
N,
Expr
nnnn
nnnn
nnnn
nnnn
If the Negative flag is ‘1’, then the program will branch relative to the next
PC. The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_N:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA N, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0008 (N = 1)
PC
SR
; If N, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-43
dsPIC30F/33F Programmer’s Reference Manual
BRA NC
Branch if Not Carry
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !C
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
1001
NC,
Expr
nnnn
nnnn
nnnn
nnnn
If the Carry flag is ‘0’, then the program will branch relative to the next PC.
The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_NC:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-44
BRA NC, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0001 (C = 1)
Preliminary
PC
SR
; If NC, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
0001 (C = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA NN
Branch if Not Negative
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !N
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0011
Description:
BRA
1011
NN,
Expr
nnnn
nnnn
nnnn
nnnn
If the Negative flag is ‘0’, then the program will branch relative to the next
PC. The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_NN:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA NN, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0000
PC
SR
; If NN, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-45
dsPIC30F/33F Programmer’s Reference Manual
BRA NOV
Branch if Not Overflow
Syntax:
{label:}
BRA
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !OV
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0011
Description:
1000
NOV,
Expr
nnnn
nnnn
nnnn
nnnn
If the Overflow flag is ‘0’, then the program will branch relative to the next
PC. The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_NOV:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-46
BRA NOV, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0008 (N = 1)
Preliminary
PC
SR
; If NOV, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0008 (N = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA NZ
Branch if Not Zero
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = !Z
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
1010
NZ,
Expr
nnnn
nnnn
nnnn
nnnn
If the Z flag is ‘0’, then the program will branch relative to the next PC. The
offset of the branch is the two’s complement number ‘2 * Slit16’, which
supports branches up to 32K instructions forward or backward. The Slit16
value is resolved by the linker from the supplied label, absolute address or
expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_NZ:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA NZ, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0002 (Z = 1)
PC
SR
; If NZ, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
0002 (Z = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-47
dsPIC30F/33F Programmer’s Reference Manual
BRA OA
Branch if Overflow Accumulator A
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = OA
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0000
Description:
1100
OA,
nnnn
Expr
nnnn
nnnn
nnnn
If the Overflow Accumulator A flag is ‘1’, then the program will branch
relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions
forward or backward. The Slit16 value is resolved by the linker from the
supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Note:
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_OA:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-48
The assembler will convert the specified label into the offset to
be used.
BRA OA, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
PC
8800 (OA, OAB = 1) SR
Preliminary
; If OA, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
8800 (OA, OAB = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA OB
Branch if Overflow Accumulator B
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = OB
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0000
Description:
1101
OB,
nnnn
Expr
nnnn
nnnn
nnnn
If the Overflow Accumulator B flag is ‘1’, then the program will branch relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions forward or backward. The Slit16 value is resolved by the linker from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_OB:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA OB, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
PC
8800 (OA, OAB = 1) SR
; If OB, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
8800 (OA, OAB = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-49
dsPIC30F/33F Programmer’s Reference Manual
BRA OV
Branch if Overflow
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = OV
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0011
Description:
0000
OV,
Expr
nnnn
nnnn
nnnn
nnnn
If the Overflow flag is ‘1’, then the program will branch relative to the next
PC. The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_OV
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-50
BRA OV, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0002 (Z = 1)
Preliminary
PC
SR
; If OV, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
0002 (Z = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA SA
Branch if Saturation Accumulator A
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = SA
If (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0000
Description:
BRA
1110
SA,
nnnn
Expr
nnnn
nnnn
nnnn
If the Saturation Accumulator A flag is ‘1’, then the program will branch
relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions forward or backward. The Slit16 value is resolved by the linker from the supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_SA:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA SA, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
PC
2400 (SA, SAB = 1) SR
; If SA, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
2400 (SA, SAB = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-51
dsPIC30F/33F Programmer’s Reference Manual
BRA SB
Branch if Saturation Accumulator B
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Operation:
Condition = SB
if (Condition)
(PC + 2) + 2 * Slit16→ PC
NOP → Instruction Register
Status Affected:
None
Encoding:
BRA
0000
Description:
1111
SB,
Expr
nnnn
nnnn
nnnn
nnnn
If the Saturation Accumulator B flag is ‘1’, then the program will branch
relative to the next PC. The offset of the branch is the two’s complement
number ‘2 * Slit16’, which supports branches up to 32K instructions forward or backward. The Slit16 value is resolved by the linker from the
supplied label, absolute address or expression.
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
Words:
1
Cycles:
1 (2 if branch taken)
Example 1:
002000 HERE:
002002 NO_SB:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
DS70157B-page 5-52
BRA SB, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0000
Preliminary
PC
SR
; If SB, branch to BYPASS
; Otherwise... continue
After
Instruction
00 2002
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BRA Z
Branch if Zero
Syntax:
{label:}
Operands:
Expr may be a label, absolute address or expression.
Expr is resolved by the linker to a Slit16, where
Slit16 ∈ [-32768 ... +32767].
Condition = Z
if (Condition)
(PC + 2) + 2 * Slit16 → PC
NOP → Instruction Register
None
0011
0010
nnnn
nnnn
nnnn
nnnn
If the Zero flag is ‘1’, then the program will branch relative to the next PC.
The offset of the branch is the two’s complement number ‘2 * Slit16’,
which supports branches up to 32K instructions forward or backward. The
Slit16 value is resolved by the linker from the supplied label, absolute
address or expression.
Operation:
Status Affected:
Encoding:
Description:
BRA
Z,
Expr
If the branch is taken, the new address will be (PC + 2) + 2 * Slit16, since
the PC will have incremented to fetch the next instruction. The instruction
then becomes a two-cycle instruction, with a NOP executed in the second
cycle.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 2).
1
1 (2 if branch taken)
Words:
Cycles:
Example 1:
002000 HERE:
002002 NO_Z:
002004
002006
002008
00200A
00200C BYPASS:
00200E
PC
SR
BRA Z, BYPASS
. . .
. . .
. . .
. . .
GOTO THERE
. . .
. . .
Before
Instruction
00 2000
0002 (Z = 1)
PC
SR
; If Z, branch to BYPASS
; Otherwise... continue
After
Instruction
00 200C
0002 (Z = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-53
dsPIC30F/33F Programmer’s Reference Manual
BSET
Bit Set f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
1 → f<bit4>
Status Affected:
None
Encoding:
1010
Description:
BSET{.B}
1000
f,
#bit4
bbbf
ffff
ffff
fffb
Set the bit in the file register ‘f’ specified by ‘bit4’. Bit numbering begins
with the Least Significant bit (bit 0) and advances to the Most Significant
bit (bit 7 for byte operations, bit 15 for word operations).
The ‘b’ bits select value bit4 of the bit position to be set.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BSET.B
0x601, #0x3
Before
Instruction
Data 0600
F234
SR
0000
Example 2:
BSET
DS70157B-page 5-54
After
Instruction
Data 0600 FA34
SR
0000
0x444, #0xF
Before
Instruction
Data 0444
5604
SR
0000
; Set bit 3 in 0x601
; Set bit 15 in 0x444
After
Instruction
Data 0444 D604
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BSET
Syntax:
Bit Set in Ws
{label:}
BSET{.B}
Ws,
#bit4
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
1 → Ws<bit4>
Status Affected:
None
Encoding:
Description:
1010
0000
bbbb
0B00
0ppp
ssss
Set the bit in register Ws specified by ‘bit4’. Bit numbering begins with the
Least Significant bit (bit 0) and advances to the Most Significant bit (bit 7
for byte operations, bit 15 for word operations). Register direct or indirect
addressing may be used for Ws.
The ‘b’ bits select value bit4 of the bit position to be cleared.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source/destination register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the source
register address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BSET.B
W3, #0x7
Before
Instruction
W3
0026
SR
0000
Example 2:
BSET
; Set bit 0 in [W4]
; Post-increment W4
5
After
Instruction
W4
6702
Data 6700
1735
SR
0000
Preliminary
Instruction
Descriptions
© 2005 Microchip Technology Inc.
After
Instruction
W3 00A6
SR
0000
[W4++], #0x0
Before
Instruction
W4
6700
Data 6700
1734
SR
0000
; Set bit 7 in W3
DS70157B-page 5-55
dsPIC30F/33F Programmer’s Reference Manual
BSW
Bit Write in Ws
Syntax:
{label:}
BSW.C
Ws,
BSW.Z
[Ws],
Wb
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Operation:
For “.C” operation:
C → Ws<(Wb)>
For “.Z” operation (default):
Z → Ws<(Wb)>
Status Affected:
None
Encoding:
Description:
1010
1101
Zwww
w000
0ppp
ssss
The (Wb) bit in register Ws is written with the value of the C or Z flag from
the STATUS register. Bit numbering begins with the Least Significant bit
(bit 0) and advances to the Most Significant bit (bit 15) of the working register. Only the four Least Significant bits of Wb are used to determine the
destination bit number. Register direct addressing must be used for Wb,
and either register direct, or indirect addressing may be used for Ws.
The ‘Z’ bit selects the C or Z flag as source.
The ‘w’ bits select the address of the bit select register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
BSW.C
This instruction only operates in Word mode. If no extension is
provided, the “.Z” operation is assumed.
W2, W3
; Set bit W3 in W2 to the value
; of the C bit
Before
After
Instruction
Instruction
W2
F234
W2 7234
W3
111F
W3
111F
SR
0002 (Z = 1, C = 0) SR 0002 (Z = 1, C = 0)
Example 2:
BSW.Z
W2, W3
; Set bit W3 in W2 to the complement
; of the Z bit
Before
After
Instruction
Instruction
W2
E235
W2
E234
W3
0550
W3
0550
SR
0002 (Z = 1, C = 0) SR
0002 (Z = 1, C = 0)
DS70157B-page 5-56
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 3:
BSW.C
[++W0], W6
; Set bit W6 in [W0++] to the value
; of the C bit
Before
After
Instruction
Instruction
W0
1000
W0
1002
W6
34A3
W6 34A3
Data 1002
2380
Data 1002
2388
SR
0001 (Z = 0, C = 1) SR
0001 (Z = 0, C = 1)
Example 4:
BSW
[W1--], W5
; Set bit W5 in [W1] to the
; complement of the Z bit
; Post-decrement W1
Before
After
Instruction
Instruction
W1
1000
W1 0FFE
W5
888B
W5 888B
Data 1000 C4DD
Data 1000 CCDD
SR
0001 (C = 1)
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-57
dsPIC30F/33F Programmer’s Reference Manual
BTG
Bit Toggle f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
(f)<bit4> → (f)<bit4>
Status Affected:
None
Encoding:
1010
Description:
BTG{.B}
1010
f,
#bit4
bbbf
ffff
ffff
fffb
Bit ‘bit4’ in file register ‘f’ is toggled (complemented). For the bit4 operand, bit numbering begins with the Least Significant bit (bit 0) and
advances to the Most Significant bit (bit 7 for byte operation, bit 15 for
word operation) of the byte.
The ‘b’ bits select value bit4, the bit position to toggle.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BTG.B
0x1001, #0x4
Before
Instruction
Data 1000
F234
SR
0000
Example 2:
BTG
DS70157B-page 5-58
After
Instruction
Data 1000 E234
SR
0000
0x1660, #0x8
Before
Instruction
Data 1660
5606
SR
0000
; Toggle bit 4 in 0x1001
; Toggle bit 8 in RAM660
After
Instruction
Data 1660
5706
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BTG
Bit Toggle in Ws
Syntax:
{label:}
BTG{.B}
Ws,
#bit4
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
(Ws)<bit4> → Ws<bit4>
Status Affected:
None
Encoding:
1010
Description:
0010
bbbb
0B00
0ppp
ssss
Bit ‘bit4’ in register Ws is toggled (complemented). For the bit4 operand,
bit numbering begins with the Least Significant bit (bit 0) and advances to
the Most Significant bit (bit 7 for byte operations, bit 15 for word
operations). Register direct or indirect addressing may be used for Ws.
The ‘b’ bits select value bit4, the bit position to test.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the source/destination register.
The ‘p’ bits select the source Address mode.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the source
register address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BTG
W2, #0x0
; Toggle bit 0 in W2
Before
Instruction
W2
F234
SR
0000
Example 2:
BTG
[W0++], #0x0
; Toggle bit 0 in [W0]
; Post-increment W0
5
After
Instruction
W0
2302
Data 2300
5607
SR
0000
Preliminary
Instruction
Descriptions
Before
Instruction
W0
2300
Data 2300
5606
SR
0000
© 2005 Microchip Technology Inc.
After
Instruction
W2
F235
SR
0000
DS70157B-page 5-59
dsPIC30F/33F Programmer’s Reference Manual
BTSC
Bit Test f, Skip if Clear
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
Test (f)<bit4>, skip if clear
Status Affected:
None
Encoding:
BTSC{.B}
1010
Description:
f,
1111
#bit4
bbbf
ffff
ffff
fffb
Bit ‘bit4’ in the file register is tested. If the tested bit is ‘0’, the next
instruction (fetched during the current instruction execution) is discarded
and on the next cycle, a NOP is executed instead. If the tested bit is ‘1’,
the next instruction is executed as normal. In either case, the contents of
the file register are not changed. For the bit4 operand, bit numbering
begins with the Least Significant bit (bit 0) and advances to the Most
Significant bit (bit 7 for byte operations, bit 15 for word operations).
The ‘b’ bits select value bit4, the bit position to test.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1 (2 or 3)
Example 1:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
Data 1200
SR
DS70157B-page 5-60
Before
Instruction
00 2000
264F
0000
0x1201, #2 ; If bit 2 of 0x1201 is 0,
; skip the GOTO
BYPASS
BTSC.B
GOTO
. . .
. . .
. . .
. . .
After
Instruction
PC
00 2002
Data 1200
264F
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
Data 0804
SR
BTSC
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 2000
2647
0000
0x804, #14 ; If bit 14 of 0x804 is 0,
BYPASS
; skip the GOTO
After
Instruction
PC
00 2004
Data 0804
2647
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-61
dsPIC30F/33F Programmer’s Reference Manual
BTSC
Bit Test Ws, Skip if Clear
Syntax:
{label:}
BTSC
Ws,
#bit4
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 15]
Operation:
Test (Ws)<bit4>, skip if clear
Status Affected:
None
Encoding:
1010
Description:
0111
bbbb
0000
0ppp
ssss
Bit ‘bit4’ in Ws is tested. If the tested bit is ‘0’, the next instruction (fetched
during the current instruction execution) is discarded and on the next
cycle, a NOP is executed instead. If the tested bit is ‘1’, the next instruction
is executed as normal. In either case, the contents of Ws are not
changed. For the bit4 operand, bit numbering begins with the Least
Significant bit (bit 0) and advances to the Most Significant bit (bit 15) of
the word. Either register direct or indirect addressing may be used for Ws.
The ‘b’ bits select value bit4, the bit position to test.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1 (2 or 3 if the next instruction is skipped)
Example 1:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
W0
SR
DS70157B-page 5-62
This instruction operates in Word mode only.
BTSC
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 2000
264F
0000
Preliminary
W0, #0x0
BYPASS
; If bit 0 of W0 is 0,
; skip the GOTO
After
Instruction
PC
00 2002
W0
264F
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
W6
SR
Example 3:
W6, #0xF
BYPASS
Before
Instruction
00 2000
264F
0000
003400 HERE:
003402
003404
003406
003408 BYPASS:
00340A
PC
W6
Data 1800
SR
BTSC
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 3400
1800
1000
0000
PC
W6
SR
BTSC
GOTO
. . .
. . .
. . .
. . .
; If bit 15 of W6 is 0,
; skip the GOTO
After
Instruction
00 2004
264F
0000
[W6++], #0xC
BYPASS
PC
W6
Data 1800
SR
; If bit 12 of [W6] is 0,
; skip the GOTO
; Post-increment W6
After
Instruction
00 3402
1802
1000
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-63
dsPIC30F/33F Programmer’s Reference Manual
BTSS
Bit Test f, Skip if Set
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
Test (f)<bit4>, skip if set
Status Affected:
None
Encoding:
BTSS{.B}
1010
Description:
f,
1110
#bit4
bbbf
ffff
ffff
fffb
Bit ‘bit4’ in the file register ‘f’ is tested. If the tested bit is ‘1’, the next
instruction (fetched during the current instruction execution) is discarded
and on the next cycle, a NOP is executed instead. If the tested bit is ‘0’, the
next instruction is executed as normal. In either case, the contents of the
file register are not changed. For the bit4 operand, bit numbering begins
with the Least Significant bit (bit 0) and advances to the Most Significant
bit (bit 7 for byte operation, bit 15 for word operation).
The ‘b’ bits select value bit4, the bit position to test.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1 (2 or 3 if the next instruction is skipped)
Example 1:
007100 HERE:
007102
007104
PC
Data 1400
SR
Example 2:
007100 HERE:
007102
007104
007106 BYPASS:
PC
Data 0890
SR
DS70157B-page 5-64
Before
Instruction
00 7100
0280
0000
Before
Instruction
00 7100
00FE
0000
BTSS.B
CLR
. . .
0x1401, #0x1 ; If bit 1 of 0x1401 is 1,
WREG
; don’t clear WREG
PC
Data 1400
SR
BTSS
GOTO
. . .
. . .
After
Instruction
00 7104
0280
0000
0x890, #0x9 ; If bit 9 of 0x890 is 1,
BYPASS
; skip the GOTO
PC
Data 0890
SR
Preliminary
After
Instruction
00 7102
00FE
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BTSS
Bit Test Ws, Skip if Set
Syntax:
{label:}
BTSS
Ws,
#bit4
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 15]
Operation:
Test (Ws)<bit4>, skip if set.
Status Affected:
None
Encoding:
1010
Description:
0110
bbbb
0000
0ppp
ssss
Bit ‘bit4’ in Ws is tested. If the tested bit is ‘1’, the next instruction (fetched
during the current instruction execution) is discarded and on the next
cycle, a NOP is executed instead. If the tested bit is ‘0’, the next instruction
is executed as normal. In either case, the contents of Ws are not
changed. For the bit4 operand, bit numbering begins with the Least
Significant bit (bit 0) and advances to the Most Significant bit (bit 15) of
the word. Either register direct or indirect addressing may be used for Ws.
The ‘b’ bits select the value bit4, the bit position to test.
The ‘s’ bits select the source register.
The ‘p’ bits select the source Address mode.
Note:
This instruction operates in Word mode only.
Words:
1
Cycles:
1 (2 or 3 if the next instruction is skipped)
Example 1:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
W0
SR
BTSS
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 2000
264F
0000
W0, #0x0
BYPASS
; If bit 0 of W0 is 1,
; skip the GOTO
After
Instruction
PC
00 2004
W0
264F
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-65
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
002000 HERE:
002002
002004
002006
002008 BYPASS:
00200A
PC
W6
SR
Example 3:
DS70157B-page 5-66
W6, #0xF
BYPASS
Before
Instruction
00 2000
264F
0000
003400 HERE:
003402
003404
003406
003408 BYPASS:
00340A
PC
W6
Data 1800
SR
BTSS
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 3400
1800
1000
0000
PC
W6
SR
BTSS
GOTO
. . .
. . .
. . .
. . .
After
Instruction
00 2002
264F
0000
[W6++], 0xC
BYPASS
PC
W6
Data 1800
SR
Preliminary
; If bit 15 of W6 is 1,
; skip the GOTO
; If bit 12 of [W6] is 1,
; skip the GOTO
; Post-increment W6
After
Instruction
00 3404
1802
1000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BTST
Bit Test f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
(f)<bit4> → Z
Status Affected:
Z
Encoding:
1010
Description:
BTST{.B}
1011
f,
#bit4
bbbf
ffff
ffff
fffb
Bit ‘bit4’ in file register ‘f’ is tested and the complement of the tested bit is
stored to the Z flag in the STATUS register. The contents of the file register are not changed. For the bit4 operand, bit numbering begins with the
Least Significant bit (bit 0) and advances to the Most Significant bit (bit 7
for byte operation, bit 15 for word operation).
The ‘b’ bits select value bit4, the bit position to be tested.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BTST.B
0x1201, #0x3
Before
Instruction
Data 1200
F7FF
SR
0000
Example 2:
BTST
; Set Z = complement of
; bit 3 in 0x1201
After
Instruction
Data 1200 F7FF
SR
0002 (Z = 1)
0x1302, #0x7
; Set Z = complement of
; bit 7 in 0x1302
Before
After
Instruction
Instruction
Data 1302
F7FF
Data 1302 F7FF
SR
0002 (Z = 1)
SR 0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-67
dsPIC30F/33F Programmer’s Reference Manual
BTST
Bit Test in Ws
Syntax:
{label:}
BTST.C
Ws,
BTST.Z
[Ws],
#bit4
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 15]
Operation:
For “.C” operation:
(Ws)<bit4> → C
For “.Z” operation (default):
(Ws)<bit4> → Z
Status Affected:
Z or C
Encoding:
Description:
1010
0011
bbbb
Z000
0ppp
ssss
Bit ‘bit4’ in register Ws is tested. If the “.Z” option of the instruction is
specified, the complement of the tested bit is stored to the Zero flag in the
STATUS register. If the “.C” option of the instruction is specified, the value
of the tested bit is stored to the Carry flag in the STATUS register. In either
case, the contents of Ws are not changed.
For the bit4 operand, bit numbering begins with the Least Significant bit
(bit 0) and advances to the Most Significant bit (bit 15) of the word. Either
register direct or indirect addressing may be used for Ws.
The ‘b’ bits select value bit4, the bit position to test.
The ‘Z’ bit selects the C or Z flag as destination.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
BTST.C
This instruction only operates in Word mode. If no extension is
provided, the “.Z” operation is assumed.
[W0++], #0x3
; Set C = bit 3 in [W0]
; Post-increment W0
Before
After
Instruction
Instruction
W0
1200
W0
1202
Data 1200
FFF7
Data 1200 FFF7
SR
0001 (C = 1)
SR
0000
Example 2:
BTST.Z
W0, #0x7
Before
Instruction
W0
F234
SR
0000
DS70157B-page 5-68
; Set Z = complement of bit 7 in W0
After
Instruction
W0
F234
SR
0002 (Z = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BTST
Syntax:
Bit Test in Ws
{label:}
BTST.C
Ws,
BTST.Z
[Ws],
Wb
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Operation:
For “.C” operation:
(Ws)<(Wb)> → C
For “.Z” operation (default):
(Ws)<(Wb)> → Z
Status Affected:
Z or C
Encoding:
Description:
1010
0101
Zwww
w000
0ppp
ssss
The (Wb) bit in register Ws is tested. If the “.C” option of the instruction is
specified, the value of the tested bit is stored to the Carry flag in the
STATUS register. If the “.Z” option of the instruction is specified, the complement of the tested bit is stored to the Zero flag in the STATUS register.
In either case, the contents of Ws are not changed.
Only the four Least Significant bits of Wb are used to determine the bit
number. Bit numbering begins with the Least Significant bit (bit 0) and
advances to the Most Significant bit (bit 15) of the working register.
Register direct or indirect addressing may be used for Ws.
The ‘Z’ bit selects the C or Z flag as destination.
The ‘w’ bits select the address of the bit select register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
BTST.C
This instruction only operates in Word mode. If no extension is
provided, the “.Z” operation is assumed.
W2, W3
Before
Instruction
W2
F234
W3
2368
SR
0001 (C = 1)
; Set C = bit W3 of W2
After
Instruction
W2 F234
W3 2368
SR 0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-69
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
BTST.Z
[W0++], W1
; Set Z = complement of
; bit W1 in [W0],
; Post-increment W0
Before
After
Instruction
Instruction
W0
1200
W0 1202
W1 CCC0
W1 CCC0
Data 1200
6243
Data 1200 6243
SR
0002 (Z = 1)
SR 0000
DS70157B-page 5-70
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
BTSTS
Bit Test/Set f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191] for byte operation
f ∈ [0 ... 8190] (even only) for word operation
bit4 ∈ [0 ... 7] for byte operation
bit4 ∈ [0 ... 15] for word operation
Operation:
(f)<bit4> → Z
1 → (f)<bit4>
Status Affected:
Z
Encoding:
1010
Description:
BTSTS{.B} f,
1100
#bit4
bbbf
ffff
ffff
fffb
Bit ‘bit4’ in file register ‘f’ is tested and the complement of the tested bit is
stored to the Zero flag in the STATUS register. The tested bit is then set
to ‘1’ in the file register. For the bit4 operand, bit numbering begins with
the Least Significant bit (bit 0) and advances to the Most Significant bit
(bit 7 for byte operations, bit 15 for word operations).
The ‘b’ bits select value bit4, the bit position to test/set.
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: When this instruction operates in Word mode, the file register
address must be word-aligned.
3: When this instruction operates in Byte mode, ‘bit4’ must be
between 0 and 7.
Words:
1
Cycles:
1
Example 1:
BTSTS.B
0x1201, #0x3 ; Set Z = complement of bit 3 in 0x1201,
; then set bit 3 of 0x1201 = 1
Before
Instruction
Data 1200
F7FF
SR
0000
Example 2:
BTSTS
After
Instruction
Data 1200 FFFF
SR
0002 (Z = 1)
0x808, #15
; Set Z = complement of bit 15 in 0x808,
; then set bit 15 of 0x808 = 1
Before
After
Instruction
Instruction
RAM300
8050
RAM300
8050
SR
0002 (Z = 1)
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-71
dsPIC30F/33F Programmer’s Reference Manual
BTSTS
Bit Test/Set in Ws
Syntax:
{label:}
BTSTS.C
Ws,
BTSTS.Z
[Ws],
#bit4
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
bit4 ∈ [0 ... 15]
Operation:
For “.C” operation:
(Ws)<bit4> → C
1 → Ws<bit4>
For “.Z” operation (default):
(Ws)<bit4> → Z
1 → Ws<bit4>
Status Affected:
Z or C
Encoding:
Description:
1010
0100
bbbb
Z000
0ppp
ssss
Bit ‘bit4’ in register Ws is tested. If the “.Z” option of the instruction is
specified, the complement of the tested bit is stored to the Zero flag in the
STATUS register. If the “.C” option of the instruction is specified, the value
of the tested bit is stored to the Carry flag in the STATUS register. In both
cases, the tested bit in Ws is set to ‘1’.
The ‘b’ bits select the value bit4, the bit position to test/set.
The ‘Z’ bit selects the C or Z flag as destination.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
BTSTS.C
This instruction only operates in Word mode. If no extension is
provided, the “.Z” operation is assumed.
[W0++], #0x3
; Set C = bit 3 in [W0]
; Set bit 3 in [W0] = 1
; Post-increment W0
Before
After
Instruction
Instruction
W0
1200
W0
1202
Data 1200
FFF7
Data 1200
FFFF
SR
0001 (C = 1)
SR
0000
Example 2:
BTSTS.Z
W0, #0x7
Before
Instruction
W0
F234
SR
0000
DS70157B-page 5-72
; Set Z = complement of bit 7
; in W0, and set bit 7 in W0 = 1
After
Instruction
W0 F2BC
SR
0002 (Z = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CALL
Call Subroutine
Syntax:
{label:}
Operands:
Expr may be a label or expression (but not a literal).
Expr is resolved by the linker to a lit23, where lit23 ∈ [0 ... 8388606].
(PC) + 4 → PC
(PC<15:0>) → (TOS)
(W15) + 2 → W15
(PC<23:16>) → (TOS)
(W15) + 2 → W15
lit23 → PC
NOP → Instruction Register
None
Operation:
Status Affected:
Encoding:
1st word
2nd word
Description:
CALL
Expr
0000
0010
nnnn
nnnn
nnnn
nnn0
0000
0000
0000
0000
0nnn
nnnn
Direct subroutine call over the entire 4-Mbyte instruction program
memory range. Before the CALL is made, the 24-bit return address
(PC + 4) is PUSHed onto the stack. After the return address is
stacked, the 23-bit value ‘lit23’ is loaded into the PC.
The ‘n’ bits form the target address.
Note:
Words:
Cycles:
2
2
Example 1:
026000
026004
.
.
026844 _FIR:
026846
PC
W15
Data A268
Data A26A
SR
Example 2:
CALL
MOV
...
...
MOV
...
Before
Instruction
02 6000
A268
FFFF
FFFF
0000
072000
072004
.
077A28 _G66:
077A2A
077A2C
Before
Instruction
07 2000
9004
FFFF
FFFF
0000
_FIR
W0, W1
; Call _FIR subroutine
#0x400, W2
PC
W15
Data A268
Data A26A
SR
CALL
MOV
...
INC
...
After
Instruction
02 6844
A26C
6004
0002
0000
_G66
W0, W1
; call routine _G66
W6, [W7++]
; routine start
PC
W15
Data 9004
Data 9006
SR
Preliminary
; _FIR subroutine start
5
After
Instruction
07 7A28
9008
2004
0007
0000
Instruction
Descriptions
PC
W15
Data 9004
Data 9006
SR
© 2005 Microchip Technology Inc.
The linker will resolve the specified expression into the lit23 to
be used.
DS70157B-page 5-73
dsPIC30F/33F Programmer’s Reference Manual
CALL
Call Indirect Subroutine
Syntax:
{label:}
Operands:
Wn ∈ [W0 ... W15]
Operation:
(PC) + 2 → PC
(PC<15:0>) → TOS
(W15) + 2 → W15
(PC<23:16>) → TOS
(W15) + 2 → W15
0 → PC<22:16>
(Wn<15:1>) → PC<15:1>
NOP → Instruction Register
Status Affected:
None
Encoding:
CALL
0000
Description:
Wn
0001
0000
0000
0000
ssss
Indirect subroutine call over the first 32K instructions of program memory.
Before the CALL is made, the 24-bit return address (PC + 2) is PUSHed
onto the stack. After the return address is stacked, Wn<15:1> is loaded
into PC<15:1> and PC<22:16> is cleared. Since PC<0> is always ‘0’,
Wn<0> is ignored.
The ‘s’ bits select the source register.
Words:
1
Cycles:
2
Example 1:
001002
001004
.
001600 _BOOT:
001602
.
PC
W0
W15
Data 6F00
Data 6F02
SR
Example 2:
DS70157B-page 5-74
Before
Instruction
00 1002
1600
6F00
FFFF
FFFF
0000
004200
004202
.
005500 _TEST:
005502
.
PC
W7
W15
Data 6F00
Data 6F02
SR
CALL W0
...
...
MOV #0x400, W2
MOV #0x300, W6
...
Before
Instruction
00 4200
5500
6F00
FFFF
FFFF
0000
PC
W0
W15
Data 6F00
Data 6F02
SR
CALL
...
...
INC
DEC
...
; Call BOOT subroutine indirectly
; using W0
; _BOOT starts here
After
Instruction
00 1600
1600
6F04
1004
0000
0000
W7
; Call TEST subroutine indirectly
; using W7
W1, W2
W1, W3
; _TEST starts here
;
PC
W7
W15
Data 6F00
Data 6F02
SR
Preliminary
After
Instruction
00 5500
5500
6F04
4202
0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CLR
Clear f or WREG
Syntax:
{label:}
CLR{.B}
f
WREG
f ∈ [0 ... 8191]
Operands:
Operation:
0 → destination designated by D
Status Affected:
None
Encoding:
Description:
1110
1111
0BDf
ffff
ffff
ffff
Clear the contents of a file register or the default working register WREG.
If WREG is specified, the WREG is cleared. Otherwise, the specified file
register ‘f’ is cleared.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
Cycles:
Example 1:
1
1
CLR.B
RAM200
Before
Instruction
RAM200 8009
SR 0000
Example 2:
CLR
; Clear RAM200 (Byte mode)
After
Instruction
RAM200 8000
SR 0000
WREG
Before
Instruction
WREG
0600
SR
0000
; Clear WREG (Word mode)
After
Instruction
WREG
0000
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-75
dsPIC30F/33F Programmer’s Reference Manual
CLR
Clear Wd
Syntax:
{label:}
CLR{.B}
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Wd ∈ [W0 ... W15]
Operands:
Operation:
0 → Wd
Status Affected:
None
Encoding:
1110
Description:
1011
0Bqq
qddd
d000
0000
Clear the contents of register Wd. Either register direct or indirect
addressing may be used for Wd.
The ‘B’ bit select byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
Note:
Words:
1
Cycles:
1
Example 1:
CLR.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W2
Before
Instruction
W2 3333
SR 0000
Example 2:
CLR
[W0++]
Before
Instruction
W0
2300
Data 2300
5607
SR
0000
DS70157B-page 5-76
; Clear W2 (Byte mode)
After
Instruction
W2 3300
SR 0000
; Clear [W0]
; Post-increment W0
After
Instruction
W0
2302
Data 2300
0000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CLR
Clear Accumulator, Prefetch Operands
Syntax:
{label:} CLR
Acc
{,[Wx],Wxd}
{,[Wy],Wyd}
{,AWB}
{,[Wx] + = kx,Wxd} {,[Wy] + = ky,Wyd}
{,[Wx] – = kx,Wxd} {,[Wy] – = ky,Wyd}
{,[W9 + W12],Wxd} {,[W11 + W12],Wyd}
Operands:
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
AWB ∈ [W13, [W13] + = 2]
Operation:
0 → Acc(A or B)
([Wx]) → Wxd; (Wx) +/– kx → Wx
([Wy]) → Wyd; (Wy) +/– ky → Wy
(Acc(B or A)) rounded → AWB
Status Affected:
OA, OB, SA, SB
Encoding:
1100
Description:
0011
A0xx
yyii
iijj
jjaa
Clear all 40 bits of the specified accumulator, optionally prefetch
operands in preparation for a MAC type instruction and optionally store
the non-specified accumulator results. This instruction clears the
respective overflow and saturate flags (either OA, SA or OB, SB).
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”. Operand AWB specifies the
optional register direct or indirect store of the convergently rounded
contents of the “other” accumulator, as described in Section 4.14.4
“MAC Write Back”.
The ‘A’ bit selects the other accumulator used for write back.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
The ‘a’ bits select the accumulator Write Back destination.
Words:
1
Cycles:
1
Example 1:
CLR
© 2005 Microchip Technology Inc.
Before
Instruction
F001
2000
C623
00 0067 2345
00 5420 3BDD
1221
0000
Preliminary
; Clear ACCA
; Load W4 with [W8], post-inc W8
; Store ACCB to W13
W4
W8
W13
ACCA
ACCB
Data 2000
SR
After
Instruction
1221
2002
5420
00 0000 0000
00 5420 3BDD
1221
0000
5
Instruction
Descriptions
W4
W8
W13
ACCA
ACCB
Data 2000
SR
A, [W8]+=2, W4, W13
DS70157B-page 5-77
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
CLR
W6
W7
W8
W10
W13
ACCA
ACCB
Data 2000
Data 3000
Data 4000
SR
DS70157B-page 5-78
B, [W8]+=2, W6, [W10]+=2, W7, [W13]+=2 ;
;
;
;
;
Before
Instruction
F001
C783
2000
3000
4000
00 0067 2345
00 5420 ABDD
1221
FF80
FFC3
0000
Preliminary
W6
W7
W8
W10
W13
ACCA
ACCB
Data 2000
Data 3000
Data 4000
SR
Clear ACCB
Load W6 with [W8]
Load W7 with [W10]
Save ACCA to [W13]
Post-inc W8,W10,W13
After
Instruction
1221
FF80
2002
3002
4002
00 0067 2345
00 0000 0000
1221
FF80
0067
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CLRWDT
Clear Watchdog Timer
Syntax:
{label:}
Operands:
None
Operation:
0 → WDT count register
0 → WDT prescaler A count
0 → WDT prescaler B count
Status Affected:
None
Encoding:
1111
CLRWDT
1110
0110
0000
0000
0000
Description:
Clear the contents of the Watchdog Timer count register and the
prescaler count registers. The Watchdog Prescaler A and Prescaler B
settings, set by configuration fuses in the FWDT, are not changed.
Words:
1
Cycles:
1
Example 1:
CLRWDT
; Clear Watchdog Timer
Before
Instruction
SR 0000
After
Instruction
SR 0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-79
dsPIC30F/33F Programmer’s Reference Manual
COM
Complement f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) → destination designated by D
Status Affected:
N, Z
Encoding:
Description:
COM{.B}
1110
1110
f
{,WREG}
1BDf
ffff
ffff
ffff
Compute the 1’s complement of the contents of the file register and place
the result in the destination register. The optional WREG operand
determines the destination register. If WREG is specified, the result is
stored in WREG. If WREG is not specified, the result is stored in the file
register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
COM.b
RAM200
Before
Instruction
RAM200 80FF
SR 0000
Example 2:
COM
After
Instruction
RAM200 8000
SR 0002 (Z)
RAM400, WREG
Before
Instruction
WREG
1211
RAM400
0823
SR
0000
DS70157B-page 5-80
; COM RAM200 (Byte mode)
; COM RAM400 and store to WREG
; (Word mode)
After
Instruction
WREG F7DC
RAM400
0823
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
COM
Complement Ws
Syntax:
{label:}
COM{.B}
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) → Wd
Status Affected:
N, Z
Encoding:
1110
Description:
1010
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
1Bqq
qddd
dppp
ssss
Compute the 1’s complement of the contents of the source register Ws
and place the result in the destination register Wd. Either register direct or
indirect addressing may be used for both Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
COM.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
[W0++], [W1++]
Before
Instruction
W0
2301
W1
2400
Data 2300
5607
Data 2400 ABCD
SR
0000
Example 2:
COM
W0, [W1++]
© 2005 Microchip Technology Inc.
After
Instruction
W0
2302
W1
2401
Data 2300
5607
Data 2400
ABA9
SR
0008 (N = 1)
; COM W0 and store to [W1] (Word mode)
; Post-increment W1
5
After
Instruction
W0
D004
W1
1002
Data 1000
2FFB
SR
0000
Preliminary
Instruction
Descriptions
Before
Instruction
W0
D004
W1
1000
Data 1000
ABA9
SR
0000
; COM [W0] and store to [W1] (Byte mode)
; Post-increment W0, W1
DS70157B-page 5-81
dsPIC30F/33F Programmer’s Reference Manual
CP
Compare f with WREG, Set Status Flags
Syntax:
{label:}
Operands:
f ∈ [0 ...8191]
Operation:
(f) – (WREG)
Status Affected:
DC, N, OV, Z, C
Encoding:
CP{.B}
1110
Description:
f
0011
0B0f
ffff
ffff
ffff
Compute (f) – (WREG) and update the STATUS register. This instruction
is equivalent to the SUBWF instruction, but the result of the subtraction is
not stored.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
CP.B
RAM400
Before
Instruction
WREG
8823
RAM400
0823
SR
0000
Example 2:
CP
0x1200
Before
Instruction
WREG
2377
Data 1200
2277
SR
0000
DS70157B-page 5-82
; Compare RAM400 with WREG (Byte mode)
After
Instruction
WREG
8823
RAM400
0823
SR
0002 (Z = 1)
; Compare (0x1200) with WREG (Word mode)
After
Instruction
WREG
2377
Data 1200
2277
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CP
Compare Wb with lit5, Set Status Flags
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Operation:
(Wb) – lit5
Status Affected:
DC, N, OV, Z, C
Encoding:
CP{.B}
1110
Description:
Wb,
0001
0www
#lit5
wB00
011k
kkkk
Compute (Wb) – lit5, and update the STATUS register. This instruction is
equivalent to the SUB instruction, but the result of the subtraction is not
stored. Register direct addressing must be used for Wb.
The ‘w’ bits select the address of the Wb base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
CP.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W4, #0x12
Before
Instruction
W4
7711
SR
0000
Example 2:
CP
; Compare W4 with 0x12 (Byte mode)
After
Instruction
W4
7711
SR
0008 (N = 1)
W4, #0x12
Before
Instruction
W4
7713
SR
0000
; Compare W4 with 0x12 (Word mode)
After
Instruction
W4
7713
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-83
dsPIC30F/33F Programmer’s Reference Manual
CP
Compare Wb with Ws, Set Status Flags
Syntax:
{label:}
CP{.B}
Wb,
Ws
[Ws]
[Ws++]
[Ws--]
[++Ws]
[--Ws]
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Operation:
(Wb) – (Ws)
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
0001
0www
wB00
0ppp
ssss
Compute (Wb) – (Ws), and update the STATUS register. This instruction is
equivalent to the SUB instruction, but the result of the subtraction is not
stored. Register direct addressing must be used for Wb. Register direct or
indirect addressing may be used for Ws.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the address of the Ws source register.
Note:
Words:
1
Cycles:
1
Example 1:
CP.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, [W1++]
Before
Instruction
W0 ABA9
W1
2000
Data 2000
D004
SR
0000
Example 2:
CP
W5, W6
; Compare [W1] with W0 (Byte mode)
; Post-increment W1
After
Instruction
W0 ABA9
W1
2001
Data 2000
D004
SR
0008 (N = 1)
; Compare W6 with W5 (Word mode)
Before
Instruction
W5
2334
W6
8001
SR
0000
DS70157B-page 5-84
Preliminary
After
Instruction
W5
2334
W6
8001
SR
000C (N, OV = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CP0
Compare f with 0x0, Set Status Flags
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) – 0x0
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
CP0{.B}
1110
f
0010
0B0f
ffff
ffff
ffff
Compute (f) – 0x0 and update the STATUS register. The result of the
subtraction is not stored.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘f’ bits select the address of the file register.
Note:
Words:
1
Cycles:
1
Example 1:
CP0.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
RAM100
Before
Instruction
RAM100
44C3
SR
0000
Example 2:
CP0
0x1FFE
Before
Instruction
Data 1FFE
0001
SR
0000
; Compare RAM100 with 0x0 (Byte mode)
After
Instruction
RAM100
44C3
SR
0008 (N = 1)
; Compare (0x1FFE) with 0x0 (Word mode)
After
Instruction
Data 1FFE
0001
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-85
dsPIC30F/33F Programmer’s Reference Manual
CP0
Compare Ws with 0x0, Set Status Flags
Syntax:
{label:}
CP0{.B}
Ws
[Ws]
[Ws++]
[Ws--]
[++Ws]
[--Ws]
Operands:
Ws ∈ [W0 ... W15]
Operation:
(Ws) – 0x0000
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
0000
0000
0B00
0ppp
ssss
Compute (Ws) – 0x0000 and update the STATUS register. The result of
the subtraction is not stored. Register direct or indirect addressing may be
used for Ws.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the address of the Ws source register.
Note:
Words:
1
Cycles:
1
Example 1:
CP0.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
[W4--]
Before
Instruction
W4
1001
Data 1000
0034
SR
0000
Example 2:
CP0
[--W5]
Before
Instruction
W5
2400
Data 23FE
9000
SR
0000
DS70157B-page 5-86
; Compare [W4] with 0 (Byte mode)
; Post-decrement W4
After
Instruction
W4
1000
Data 1000
0034
SR
0002 (Z = 1)
; Compare [--W5] with 0 (Word mode)
After
Instruction
W5
23FE
Data 23FE
9000
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CPB
Compare f with WREG using Borrow, Set Status Flags
Syntax:
{label:}
CPB{.B}
Operands:
f ∈ [0 ...8191]
Operation:
(f) – (WREG) – (C)
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
0011
f
1B0f
ffff
ffff
ffff
Compute (f) – (WREG) – (C), and update the STATUS register. This
instruction is equivalent to the SUBB instruction, but the result of the
subtraction is not stored.
Description:
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR. These
instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
CPB.B
RAM400
Before
Instruction
WREG
8823
RAM400
0823
SR
0000
Example 2:
CPB
0x1200
; Compare RAM400 with WREG using C (Byte mode)
After
Instruction
WREG
8823
RAM400
0823
SR
0008 (N = 1)
; Compare (0x1200) with WREG using C (Word mode)
Before
After
Instruction
Instruction
WREG
2377
WREG
2377
Data 1200
2377
Data 1200
2377
SR
0001 (C = 1)
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-87
dsPIC30F/33F Programmer’s Reference Manual
CPB
Compare Wb with lit5 using Borrow, Set Status Flags
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Operation:
(Wb) – lit5 – (C)
Status Affected:
DC, N, OV, Z, C
Encoding:
CPB{.B}
1110
Wb,
0001
1www
#lit5
wB00
011k
kkkk
Compute (Wb) – lit5 – (C), and update the STATUS register. This instruction is equivalent to the SUBB instruction, but the result of the subtraction is
not stored. Register direct addressing must be used for Wb.
Description:
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits provide the literal operand, a five bit integer number.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR. These
instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
CPB.B
W4, #0x12
Before
Instruction
W4
7711
SR
0001 (C = 1)
Example 2:
CPB.B
W4, #0x12
Before
Instruction
W4
7711
SR
0000
Example 3:
CPB
W12, #0x1F
Before
Instruction
W12
0020
SR
0002 (Z = 1)
Example 4:
CPB
W12, #0x1F
Before
Instruction
W12
0020
SR
0003 (Z, C = 1)
DS70157B-page 5-88
; Compare W4 with 0x12 using C (Byte mode)
After
Instruction
W4
7711
SR
0008 (N = 1)
; Compare W4 with 0x12 using C (Byte mode)
After
Instruction
W4
7711
SR
0008 (N = 1)
; Compare W12 with 0x1F using C (Word mode)
After
Instruction
W12
0020
SR
0003 (Z, C = 1)
; Compare W12 with 0x1F using C (Word mode)
After
Instruction
W12
0020
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CPB
Compare Ws with Wb using Borrow, Set Status Flags
Syntax:
{label:}
CPB{.B}
Wb,
Ws
[Ws]
[Ws++]
[Ws--]
[++Ws]
[--Ws]
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Operation:
(Wb) – (Ws) – (C)
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1110
0001
1www
wB00
0ppp
ssss
Compute (Wb) – (Ws) – (C), and update the STATUS register. This instruction is equivalent to the SUBB instruction, but the result of the subtraction is
not stored. Register direct addressing must be used for Wb. Register direct
or indirect addressing may be used for Ws.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the address of the Ws source register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR. These
instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
CPB.B
W0, [W1++] ; Compare [W1] with W0 using C (Byte mode)
; Post-increment W1
Before
After
Instruction
Instruction
W0 ABA9
W0 ABA9
W1
1000
W1
1001
Data 1000 D0A9
Data 1000 D0A9
SR
0002 (Z = 1)
SR
0008 (N = 1)
Example 2:
CPB.B
W0, [W1++] ; Compare [W1] with W0 using C (Byte mode)
; Post-increment W1
5
© 2005 Microchip Technology Inc.
Preliminary
Instruction
Descriptions
Before
After
Instruction
Instruction
W0 ABA9
W0 ABA9
W1
1000
W1
1001
Data 1000 D0A9
Data 1000 D0A9
SR
0001 (C = 1)
SR
0001 (C = 1)
DS70157B-page 5-89
dsPIC30F/33F Programmer’s Reference Manual
Example 3:
CPB
W4, W5
Before
Instruction
W4
4000
W5
3000
SR
0001 (C = 1)
DS70157B-page 5-90
; Compare W5 with W4 using C (Word mode)
After
Instruction
W4
4000
W5
3000
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CPSEQ
Compare Wb with Wn, Skip if Equal (Wb = Wn)
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wn ∈ [W0 ... W15]
Operation:
(Wb) – (Wn)
Skip if (Wb) = (Wn)
Status Affected:
None
Encoding:
CPSEQ{.B} Wb,
1110
Description:
0111
Wn
1www
wB00
0000
ssss
Compare the contents of Wb with the contents of Wn by performing the
subtraction (Wb) – (Wn), but do not store the result. If (Wb) = (Wn), the
next instruction (fetched during the current instruction execution) is
discarded and on the next cycle, a NOP is executed instead. If
(Wb) ≠ (Wn), the next instruction is executed as normal.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the address of the Ws source register.
Note:
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
Words:
1
Cycles:
1 (2 or 3 if skip taken)
Example 1:
002000 HERE: CPSEQ.B W0, W1
002002
GOTO
BYPASS
002004
. . .
002006
. . .
002008 BYPASS:. . .
00200A
. . .
PC
W0
W1
SR
Example 2:
018000 HERE:
018002
018006
018008
PC
W0
W1
SR
CPSEQ
CALL
...
...
W4, W8
_FIR
Before
Instruction
01 8000
3344
3344
0002 (Z = 1)
Preliminary
After
Instruction
00 2002
1001
1000
0000
; If W4 = W8 (Word mode),
; skip the subroutine call
PC
W4
W8
SR
After
Instruction
01 8006
3344
3344
0002 (Z = 1)
DS70157B-page 5-91
5
Instruction
Descriptions
PC
W4
W8
SR
© 2005 Microchip Technology Inc.
Before
Instruction
00 2000
1001
1000
0000
; If W0 = W1 (Byte mode),
; skip the GOTO
dsPIC30F/33F Programmer’s Reference Manual
CPSGT
Signed Compare Wb with Wn, Skip if Greater Than (Wb > Wn)
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wn ∈ [W0 ... W15]
Operation:
(Wb) – (Wn)
Skip if (Wb) > (Wn)
Status Affected:
None
Encoding:
CPSGT{.B}
1110
Description:
0110
Wb,
Wn
0www
wB00
0000
ssss
Compare the contents of Wb with the contents of Wn by performing the
subtraction (Wb) – (Wn), but do not store the result. If (Wb) > (Wn), the
next instruction (fetched during the current instruction execution) is
discarded and on the next cycle, a NOP is executed instead. Otherwise,
the next instruction is executed as normal.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the address of the Ws source register.
Note:
Words:
1
Cycles:
1 (2 or 3 if skip taken)
Example 1:
002000 HERE:
002002
002006
002008
00200A BYPASS
00200C
PC
W0
W1
SR
Example 2:
CPSGT.B
GOTO
. . .
. . .
. . .
. . .
Before
Instruction
00 2000
00FF
26FE
0009 (N, C = 1)
018000 HERE:
018002
018006
018008
PC
W4
W5
SR
DS70157B-page 5-92
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
CPSGT
CALL
...
...
Before
Instruction
01 8000
2600
2600
0004 (OV = 1)
Preliminary
W0, W1 ; If W0 > W1 (Byte mode),
BYPASS ; skip the GOTO
PC
W0
W1
SR
After
Instruction
00 2006
00FF
26FE
0009 (N, C = 1)
W4, W5 ; If W4 > W5 (Word mode),
_FIR
; skip the subroutine call
PC
W4
W5
SR
After
Instruction
01 8002
2600
2600
0004 (OV = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
CPSLT
Signed Compare Wb with Wn, Skip if Less Than (Wb < Wn)
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wn ∈ [W0 ... W15]
Operation:
(Wb) – (Wn)
Skip if (Wb) < (Wn)
Status Affected:
None
Encoding:
CPSLT{.B}
1110
Description:
0110
Wb,
Wn
1www
wB00
0000
ssss
Compare the contents of Wb with the contents of Wn by performing the
subtraction (Wb) – (Wn), but do not store the result. If (Wb) < (Wn), the
next instruction (fetched during the current instruction execution) is
discarded and on the next cycle, a NOP is executed instead. Otherwise, the
next instruction is executed as normal.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the address of the Ws source register.
Note:
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
Words:
1
Cycles:
1 (2 or 3 if skip taken)
Example 1:
002000 HERE:
002002
002006
002008
00200A BYPASS:
00200C
PC
W8
W9
SR
Example 2:
CPSLT
CALL
. . .
. . .
Before
Instruction
01 8000
2600
3000
0000
Preliminary
W8, W9 ; If W8 < W9 (Byte mode),
BYPASS ; skip the GOTO
After
Instruction
00 2002
00FF
26FE
0008 (N = 1)
PC
W8
W9
SR
W3, W6
_FIR
; If W3 < W6 (Word mode),
; skip the subroutine call
PC
W3
W6
SR
After
Instruction
01 8006
2600
3000
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Before
Instruction
00 2000
00FF
26FE
0008 (N = 1)
018000 HERE:
018002
018006
018008
PC
W3
W6
SR
CPSLT.B
GOTO
. . .
. . .
. . .
. . .
DS70157B-page 5-93
dsPIC30F/33F Programmer’s Reference Manual
CPSNE
Signed Compare Wb with Wn, Skip if Not Equal (Wb ≠ Wn)
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wn ∈ [W0 ... W15]
Operation:
(Wb) – (Wn)
Skip if (Wb) ≠ (Wn)
Status Affected:
None
Encoding:
CPSNE{.B} Wb,
1110
Description:
0111
Wn
0www
wB00
0000
ssss
Compare the contents of Wb with the contents of Wn by performing the
subtraction (Wb) – (Wn), but do not store the result. If (Wb) ≠ (Wn), the next
instruction (fetched during the current instruction execution) is discarded
and on the next cycle, a NOP is executed instead. Otherwise, the next
instruction is executed as normal.
The ‘w’ bits select the address of the Wb source register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the address of the Ws source register.
Note:
Words:
1
Cycles:
1 (2 or 3 if skip taken)
Example 1:
002000 HERE:
002002
002006
002008
00200A BYPASS:
00200C
PC
W2
W3
SR
Example 2:
CPSNE.B
GOTO
. . .
. . .
. . .
. . .
W2, W3 ; If W2 != W3 (Byte mode),
BYPASS ; skip the GOTO
Before
Instruction
00 2000
00FF
26FE
0001 (C = 1)
018000 HERE:
018002
018006
018008
PC
W0
W8
SR
DS70157B-page 5-94
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
CPSNE
CALL
...
...
PC
W2
W3
SR
W0, W8
_FIR
Before
Instruction
01 8000
3000
3000
0000
Preliminary
After
Instruction
00 2006
00FF
26FE
0001 (C = 1)
; If W0 != W8 (Word mode),
; skip the subroutine call
PC
W0
W8
SR
After
Instruction
01 8002
3000
3000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DAW.B
Decimal Adjust Wn
Syntax:
{label:}
DAW.B
Wn
Operands:
Wn ∈ [W0 ... W15]
Operation:
If (Wn<3:0> > 9) or (DC = 1)
(Wn<3:0>) + 6 → Wn<3:0>
Else
(Wn<3:0>) → Wn<3:0>
If (Wn<7:4> > 9) or (C = 1)
(Wn<7:4>) + 6 → Wn<7:4>
Else
(Wn<7:4>) → Wn<7:4>
Status Affected:
C
Encoding:
Description:
1111
1101
0100
0000
0000
ssss
Adjust the Least Significant Byte in Wn to produce a binary coded decimal
(BCD) result. The Most Significant Byte of Wn is not changed, and the
Carry flag is used to indicate any decimal rollover. Register direct
addressing must be used for Wn.
The ‘s’ bits select the source/destination register.
Note 1: This instruction is used to correct the data format after two
packed BCD bytes have been added.
2: This instruction operates in Byte mode only and the .B
extension must be included with the opcode.
Words:
1
Cycles:
1
Example 1:
DAW.B
W0
; Decimal adjust W0
Before
Instruction
W0 771A
SR
0002 (DC = 1)
Example 2:
DAW.B
W3
Before
Instruction
W3 77AA
SR
0000
After
Instruction
W0
7720
SR
0002 (DC = 1)
; Decimal adjust W3
After
Instruction
W3
7710
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-95
dsPIC30F/33F Programmer’s Reference Manual
DEC
Decrement f
Syntax:
{label:}
DEC{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) – 1 → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
1101
0BDf
ffff
ffff
ffff
Subtract one from the contents of the file register and place the result in the
destination register. The optional WREG operand determines the destination register. If WREG is specified, the result is stored in WREG. If WREG
is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
DEC.B
0x200
Before
Instruction
Data 200 80FF
SR
0000
Example 2:
DEC
After
Instruction
Data 200 80FE
SR
0009 (N, C = 1)
RAM400, WREG
Before
Instruction
WREG
1211
RAM400
0823
SR
0000
DS70157B-page 5-96
; Decrement (0x200) (Byte mode)
; Decrement RAM400 and store to WREG
; (Word mode)
After
Instruction
WREG
0822
RAM400
0823
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DEC
Decrement Ws
Syntax:
{label:}
DEC{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operands:
Operation:
(Ws) – 1 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
1001
0Bqq
qddd
dppp
ssss
Subtract one from the contents of the source register Ws and place the
result in the destination register Wd. Either register direct or indirect
addressing may be used by Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
DEC.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
[W7++], [W8++]
Before
Instruction
W7
2301
W8
2400
Data 2300
5607
Data 2400 ABCD
SR
0000
Example 2:
DEC
W5, [W6++]
© 2005 Microchip Technology Inc.
After
Instruction
W7
2302
W8
2401
Data 2300
5607
Data 2400
AB55
SR
0000
; Decrement W5 and store to [W6] (Word mode)
; Post-increment W6
5
After
Instruction
W5
D004
W6
2002
Data 2000
D003
SR
0009 (N, C = 1)
Preliminary
Instruction
Descriptions
Before
Instruction
W5
D004
W6
2000
Data 2000 ABA9
SR
0000
; DEC [W7] and store to [W8] (Byte mode)
; Post-increment W7, W8
DS70157B-page 5-97
dsPIC30F/33F Programmer’s Reference Manual
DEC2
Decrement f by 2
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) – 2 → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
DEC2{.B}
1110
Description:
1101
f
{,WREG}
1BDf
ffff
ffff
ffff
Subtract two from the contents of the file register and place the result in the
destination register. The optional WREG operand determines the destination register. If WREG is specified, the result is stored in WREG. If WREG
is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note:
Words:
1
Cycles:
1
Example 1:
DEC2.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
0x200
Before
Instruction
Data 200 80FF
SR
0000
Example 2:
DEC2
After
Instruction
Data 200 80FD
SR
0009 (N, C = 1)
RAM400, WREG
Before
Instruction
WREG
1211
RAM400
0823
SR
0000
DS70157B-page 5-98
; Decrement (0x200) by 2 (Byte mode)
; Decrement RAM400 by 2 and
; store to WREG (Word mode)
After
Instruction
WREG
0821
RAM400
0823
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DEC2
Decrement Ws by 2
Syntax:
{label:}
DEC2{.B}
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) – 2 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1110
1001
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
1Bqq
qddd
dppp
ssss
Subtract two from the contents of the source register Ws and place the
result in the destination register Wd. Either register direct or indirect
addressing may be used by Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
DEC2.B [W7--], [W8--]; DEC [W7] by 2, store to [W8] (Byte mode)
; Post-decrement W7, W8
Before
Instruction
W7
2301
W8
2400
Data 2300
0107
Data 2400 ABCD
SR
0000
Example 2:
DEC2
W5, [W6++]
; DEC W5 by 2, store to [W6] (Word mode)
; Post-increment W6
5
After
Instruction
W5
D004
W6
1002
Data 1000
D002
SR
0009 (N, C = 1)
Preliminary
Instruction
Descriptions
Before
Instruction
W5
D004
W6
1000
Data 1000 ABA9
SR
0000
© 2005 Microchip Technology Inc.
After
Instruction
W7
2300
W8
23FF
Data 2300
0107
Data 2400
ABFF
SR
0008 (N = 1)
DS70157B-page 5-99
dsPIC30F/33F Programmer’s Reference Manual
DISI
Disable Interrupts Temporarily
Syntax:
{label:}
Operands:
lit14 ∈ [0 ... 16383]
Operation:
lit14 → DISICNT
1 → DISI
Disable interrupts for (lit14 + 1) cycles
Status Affected:
None
Encoding:
1111
Description:
Words:
1
Cycles:
1
Example 1:
#lit14
1100
00kk
kkkk
kkkk
kkkk
Disable interrupts of priority 0 through priority 6 for (lit14 + 1) instruction
cycles. Priority 0 through priority 6 interrupts are disabled starting in the
cycle that DISI executes, and remain disabled for the next (lit 14) cycles.
The lit14 value is written to the DISICNT register, and the DISI flag
(INTCON2<14>) is set to ‘1’. This instruction can be used before
executing time critical code, to limit the effects of interrupts.
Note:
This instruction does not prevent priority 7 interrupts and traps
from running. See the dsPIC30F Family Reference Manual
(DS70046) for details.
002000 HERE:
002002
002004
PC
DISICNT
INTCON2
SR
DS70157B-page 5-100
DISI
DISI
#100
; Disable interrupts for 101 cycles
; next 100 cycles protected by DISI
. . .
Before
Instruction
00 2000
0000
0000
0000
Preliminary
PC
DISICNT
INTCON2
SR
After
Instruction
00 2002
0100
4000 (DISI = 1)
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DIV.S
Syntax:
Signed Integer Divide
{label:}
DIV.S{W}
Wm, Wn
DIV.SD
Wm, Wn
Operands:
Wm ∈ [W0 ... W15] for word operation
Wm ∈ [W0, W2, W4 ... W14] for double operation
Wn ∈ [W2 ... W15]
Operation:
For word operation (default):
Wm → W0
If (Wm<15> = 1):
0xFFFF → W1
Else:
0x0 → W1
W1:W0 / Wn → W0
Remainder → W1
For double operation (DIV.SD):
Wm + 1:Wm → W1:W0
W1:W0 / Wn → W0
Remainder → W1
Status Affected:
Encoding:
Description:
N, OV, Z, C
1101
1000
0ttt
tvvv
vW00
ssss
Iterative, signed integer divide, where the dividend is stored in Wm (for a
16-bit by 16-bit divide) or Wm + 1:Wm (for a 32-bit by 16-bit divide) and
the divisor is stored in Wn. In the default word operation, Wm is first copied to W0 and sign-extended through W1 to perform the operation. In the
double operation, Wm + 1:Wm is first copied to W1:W0. The 16-bit quotient of the divide operation is stored in W0, and the 16-bit remainder is
stored in W1.
This instruction must be executed 18 times using the REPEAT instruction
(with an iteration count of 17) to generate the correct quotient and
remainder. The N flag will be set if the remainder is negative and cleared
otherwise. The OV flag will be set if the divide operation resulted in an
overflow and cleared otherwise. The Z flag will be set if the remainder is
‘0’ and cleared otherwise. The C flag is used to implement the divide
algorithm and its final value should not be used.
The ‘t’ bits select the most significant word of the dividend for the double
operation. These bits are clear for the word operation.
The ‘v’ bits select the least significant word of the dividend.
The ‘W’ bit selects the dividend size (‘0’ for 16-bit, ‘1’ for 32-bit).
The ‘s’ bits select the divisor register.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-101
5
Instruction
Descriptions
Note 1: The extension .D in the instruction denotes a double word
(32-bit) dividend rather than a word dividend. You may use a .W
extension to denote a word operation, but it is not required.
2: Unexpected results will occur if the quotient can not be represented in 16 bits. When this occurs for the double operation
(DIV.SD), the OV status bit will be set and the quotient and
remainder should not be used. For the word operation (DIV.S),
only one type of overflow may occur (0x8000/0xFFFF = +
32768 or 0x00008000), which allows the OV status bit to interpret the result.
3: Dividing by zero will initiate an arithmetic error trap during the
first cycle of execution.
4: This instruction is interruptible on each instruction cycle
boundary.
dsPIC30F/33F Programmer’s Reference Manual
DIV.S
Signed Integer Divide
Words:
1
Cycles:
18 (plus 1 for REPEAT execution)
Example 1:
REPEAT #17
DIV.S W3, W4
Before
Instruction
W0
5555
W1
1234
W3
3000
W4
0027
SR
0000
Example 2:
REPEAT
DIV.SD
#17
W0, W12
Before
Instruction
W0
2500
W1
FF42
W12
2200
SR
0000
DS70157B-page 5-102
; Execute DIV.S 18 times
; Divide W3 by W4
; Store quotient to W0, remainder to W1
After
Instruction
W0
013B
W1
0003
W3
3000
W4
0027
SR
0000
; Execute DIV.SD 18 times
; Divide W1:W0 by W12
; Store quotient to W0, remainder to W1
After
Instruction
W0
FA6B
W1
EF00
W12
2200
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DIV.U
Syntax:
Unsigned Integer Divide
{label:}
DIV.U{W}
Wm, Wn
DIV.UD
Wm, Wn
Operands:
Wm ∈ [W0 ... W15] for word operation
Wm ∈ [W0, W2, W4 ... W14] for double operation
Wn ∈ [W2 ... W15]
Operation:
For word operation (default):
Wm → W0
0x0 → W1
W1:W0/Wn → W0
Remainder → W1
For double operation (DIV.UD):
Wm + 1:Wm → W1:W0
W1:W0/Wns → W0
Remainder → W1
Status Affected:
N, OV, Z, C
Encoding:
Description:
1101
1000
1ttt
tvvv
vW00
ssss
Iterative, unsigned integer divide, where the dividend is stored in Wm (for
a 16-bit by 16-bit divide), or Wm + 1:Wm (for a 32-bit by 16-bit divide) and
the divisor is stored in Wn. In the word operation, Wm is first copied to W0
and W1 is cleared to perform the divide. In the double operation,
Wm + 1:Wm is first copied to W1:W0. The 16-bit quotient of the divide
operation is stored in W0, and the 16-bit remainder is stored in W1.
This instruction must be executed 18 times using the REPEAT instruction
(with an iteration count of 17) to generate the correct quotient and
remainder. The N flag will always be cleared. The OV flag will be set if the
divide operation resulted in an overflow and cleared otherwise. The Z flag
will be set if the remainder is ‘0’ and cleared otherwise. The C flag is used
to implement the divide algorithm and its final value should not be used.
The ‘t’ bits select the most significant word of the dividend for the double
operation. These bits are clear for the word operation.
The ‘v’ bits select the least significant word of the dividend.
The ‘W’ bit selects the dividend size (‘0’ for 16-bit, ‘1’ for 32-bit).
The ‘s’ bits select the divisor register.
Note 1: The extension .D in the instruction denotes a double word
(32-bit) dividend rather than a word dividend. You may use a .W
extension to denote a word operation, but it is not required.
2: Unexpected results will occur if the quotient can not be
represented in 16 bits. This may only occur for the double operation (DIV.UD). When an overflow occurs, the OV status bit will
be set and the quotient and remainder should not be used.
3: Dividing by zero will initiate an arithmetic error trap during the
first cycle of execution.
4: This instruction is interruptible on each instruction cycle
boundary.
1
Cycles:
18 (plus 1 for REPEAT execution)
© 2005 Microchip Technology Inc.
Preliminary
Instruction
Descriptions
Words:
5
DS70157B-page 5-103
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
REPEAT #17
DIV.U W2, W4
Before
Instruction
W0
5555
W1
1234
W2
8000
W4
0200
SR
0000
Example 2:
REPEAT
DIV.UD
#17
W10, W12
Before
Instruction
W0
5555
W1
1234
W10
2500
W11
0042
W12
2200
SR
0000
DS70157B-page 5-104
; Execute DIV.U 18 times
; Divide W2 by W4
; Store quotient to W0, remainder to W1
After
Instruction
W0
0040
W1
0000
W2
8000
W4
0200
SR
0002 (Z = 1)
; Execute DIV.UD 18 times
; Divide W11:W10 by W12
; Store quotient to W0, remainder to W1
After
Instruction
W0
01F2
W1
0100
W10
2500
W11
0042
W12
2200
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DIVF
Fractional Divide
Syntax:
{label:}
Operands:
Wm ∈ [W0 ... W15]
Wn ∈ [W2 ... W15]
Operation:
0x0 → W0
Wm → W1
W1:W0/Wn → W0
Remainder → W1
Status Affected:
N, OV, Z, C
Encoding:
Description:
DIVF
1101
Wm, Wn
1001
0ttt
t000
0000
ssss
Iterative, signed fractional 16-bit by 16-bit divide, where the dividend is
stored in Wm and the divisor is stored in Wn. To perform the operation,
W0 is first cleared and Wm is copied to W1. The 16-bit quotient of the
divide operation is stored in W0, and the 16-bit remainder is stored in W1.
The sign of the remainder will be the same as the sign of the dividend.
This instruction must be executed 18 times using the REPEAT instruction
(with an iteration count of 17) to generate the correct quotient and
remainder. The N flag will be set if the remainder is negative and cleared
otherwise. The OV flag will be set if the divide operation resulted in an
overflow and cleared otherwise. The Z flag will be set if the remainder is
‘0’ and cleared otherwise. The C flag is used to implement the divide
algorithm and its final value should not be used.
The ‘t’ bits select the dividend register.
The ‘s’ bits select the divisor register.
Note 1: For the fractional divide to be effective, Wm must be less than
or equal to Wn. If Wm is greater than Wn, unexpected results
will occur because the fractional result will be greater than 1.0.
When this occurs, the OV status bit will be set and the quotient
and remainder should not be used.
2: Dividing by zero will initiate an arithmetic error trap during the
first cycle of execution.
3: This instruction is interruptible on each instruction cycle
boundary.
Words:
1
Cycles:
18 (plus 1 for REPEAT execution)
Example 1:
REPEAT
DIVF
#17
W8, W9
© 2005 Microchip Technology Inc.
After
Instruction
W0
2000
W1
0000
W8
1000
W9
4000
SR
0002 (Z = 1)
Preliminary
5
Instruction
Descriptions
Before
Instruction
W0
8000
W1
1234
W8
1000
W9
4000
SR
0000
; Execute DIVF 18 times
; Divide W8 by W9
; Store quotient to W0, remainder to W1
DS70157B-page 5-105
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
REPEAT #17
DIVF
W8, W9
Before
Instruction
W0
8000
W1
1234
W8
1000
W9
8000
SR
0000
Example 3:
REPEAT #17
DIVF
W0, W1
Before
Instruction
W0
8002
W1
8001
SR
0000
DS70157B-page 5-106
; Execute DIVF 18 times
; Divide W8 by W9
; Store quotient to W0, remainder to W1
After
Instruction
W0
F000
W1
0000
W8
1000
W9
8000
SR
0002 (Z = 1)
; Execute DIVF 18 times
; Divide W0 by W1
; Store quotient to W0, remainder to W1
After
Instruction
W0
7FFE
W1
8002
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DO
Initialize Hardware Loop Literal
Syntax:
{label:}
Operands:
lit14 ∈ [0 ... 16383]
Expr may be an absolute address, label or expression.
Expr is resolved by the linker to a Slit16, where Slit16 ∈ [-32768 ... +32767].
Operation:
PUSH DO shadows (DCOUNT, DOEND, DOSTART)
(lit14) → DCOUNT
(PC) + 4 → PC
(PC) → DOSTART
(PC) + (2 * Slit16) → DOEND
Increment DL<2:0> (CORCON<10:8>)
Status Affected:
DA
Encoding:
Description:
DO
#lit14,
Expr
0000
1000
00kk
kkkk
kkkk
kkkk
0000
0000
nnnn
nnnn
nnnn
nnnn
Initiate a no overhead hardware DO loop, which is executed (lit14 + 1)
times. The DO loop begins at the address following the DO instruction, and
ends at the address 2 * Slit16 instruction words away. The 14-bit count
value (lit14) supports a maximum loop count value of 16384, and the 16-bit
offset value (Slit16) supports offsets of 32K instruction words in both
directions.
When this instruction executes, DCOUNT, DOSTART and DOEND are first
PUSHed into their respective shadow registers, and then updated with the
new DO loop parameters specified by the instruction. The DO level count,
DL<2:0> (CORCON<8:10>), is then incremented. After the DO loop
completes execution, the PUSHed DCOUNT, DOSTART and DOEND
registers are restored, and DL<2:0> is decremented.
The ‘k’ bits specify the loop count.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from the PC to the last instruction executed in the loop.
Special Features, Restrictions:
The following features and restrictions apply to the DO instruction.
1. Using a loop count of ‘0’ will result in the loop being executed one
time.
2. Using a loop size of -2, -1 or 0 is invalid. Unexpected results may
occur if these offsets are used.
3. The very last two instructions of the DO loop can NOT be:
• an instruction which changes program control flow
• a DO or REPEAT instruction
Unexpected results may occur if any of these instructions are used.
Note 1: The DO instruction is interruptible and supports 1 level of
hardware nesting. Nesting up to an additional 5 levels may be
provided in software by the user. See the dsPIC30F Family
Reference Manual (DS70046) for details.
2: The linker will convert the specified expression into the offset to
be used.
2
Cycles:
2
© 2005 Microchip Technology Inc.
Instruction
Descriptions
Words:
5
Preliminary
DS70157B-page 5-107
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
002000 LOOP6:
002004
002006
002008
00200A END6:
00200C
PC
DCOUNT
DOSTART
DOEND
CORCON
SR
Example 2:
Before
Instruction
00 2000
0000
FF FFFF
FF FFFF
0000
0001 (C = 1)
PC
DCOUNT
DOSTART
DOEND
CORCON
SR
01C000 LOOP12: DO #0x160, END12
01C004
DEC W1, W2
01C006
. . .
01C008
. . .
01C00A
. . .
01C00C
. . .
01C00E
. . .
01C010
CALL _FIR88
01C014 END12: NOP
PC
DCOUNT
DOSTART
DOEND
CORCON
SR
DS70157B-page 5-108
DO
#5, END6
ADD
W1, W2, W3
. . .
. . .
SUB
W2, W3, W4
. . .
Before
Instruction
01 C000
0000
FF FFFF
FF FFFF
0000
0008 (N = 1)
Preliminary
PC
DCOUNT
DOSTART
DOEND
CORCON
SR
; Initiate DO loop (5 reps)
; First instruction in loop
; Last instruction in loop
After
Instruction
00 2004
0005
00 2004
00 200A
0100 (DL = 1)
0201 (DA, C = 1)
; Init DO loop (352 reps)
; First instruction in loop
; Call the FIR88 subroutine
; Last instruction in loop
; (Required NOP filler)
After
Instruction
01 C004
0160
01 C004
01 C014
0100 (DL = 1)
0208 (DA, N = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
DO
Initialize Hardware Loop Wn
Syntax:
{label:}
Operands:
Wn ∈ [W0 ... W15]
Expr may be an absolute address, label or expression.
Expr is resolved by the linker to a Slit16, where Slit16 ∈ [-32768 ... +32767].
Operation:
PUSH Shadows (DCOUNT, DOEND, DOSTART)
(Wn) → DCOUNT
(PC) + 4 → PC
(PC) → DOSTART
(PC) + (2 * Slit16) → DOEND
Increment DL<2:0> (CORCON<10:8>)
Status Affected:
DA
Encoding:
Description:
DO
Wn,
Expr
0000
1000
1000
0000
0000
ssss
0000
0000
nnnn
nnnn
nnnn
nnnn
Initiate a no overhead hardware DO loop, which is executed (Wn + 1) times.
The DO loop begins at the address following the DO instruction, and ends at
the address 2 * Slit16 instruction words away. The lower 14 bits of Wn
support a maximum count value of 16384, and the 16-bit offset value
(Slit16) supports offsets of 32K instruction words in both directions.
When this instruction executes, DCOUNT, DOSTART and DOEND are first
PUSHed into their respective shadow registers, and then updated with the
new DO loop parameters specified by the instruction. The DO level count,
DL<2:0> (CORCON<8:10>), is then incremented. After the DO loop
completes execution, the PUSHed DCOUNT, DOSTART and DOEND
registers are restored, and DL<2:0> is decremented.
The ‘s’ bits specify the register Wn that contains the loop count.
The ‘n’ bits are a signed literal that specifies the number of instructions
offset from (PC + 4), which is the last instruction executed in the loop.
Special Features, Restrictions:
The following features and restrictions apply to the DO instruction.
1. Using a loop count of ‘0’ will result in the loop being executed one
time.
2. Using an offset of -2, -1 or 0 is invalid. Unexpected results may occur
if these offsets are used.
3. The very last two instructions of the DO loop can NOT be:
• an instruction which changes program control flow
• a DO or REPEAT instruction
Unexpected results may occur if these last instructions are used.
Note 1: The DO instruction is interruptible and supports 1 level of nesting.
Nesting up to an additional 5 levels may be provided in software
by the user. See the dsPIC30F Family Reference Manual
(DS70046) for details.
2: The linker will convert the specified expression into the offset to
be used.
2
Cycles:
2
© 2005 Microchip Technology Inc.
Instruction
Descriptions
Words:
5
Preliminary
DS70157B-page 5-109
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
002000 LOOP6:
002004
002006
002008
00200A
00200C
00200E
002010 END6:
PC
W0
DCOUNT
DOSTART
DOEND
CORCON
SR
Example 2:
DS70157B-page 5-110
Before
Instruction
00 2000
0012
0000
FF FFFF
FF FFFF
0000
0000
002000 LOOPA:
002004
002006
002008
00200A
002010 ENDA:
PC
W7
DCOUNT
DOSTART
DOEND
CORCON
SR
DO
ADD
. . .
. . .
. . .
REPEAT
SUB
NOP
W0, END6
; Initiate DO loop (W0 reps)
W1, W2, W3 ; First instruction in loop
#6
W2, W3, W4
; Last instruction in loop
; (Required NOP filler)
PC
W0
DCOUNT
DOSTART
DOEND
CORCON
SR
DO
SWAP
. . .
. . .
. . .
MOV
Before
Instruction
00 2000
E00F
0000
FF FFFF
FF FFFF
0000
0000
Preliminary
W7, ENDA
W0
After
Instruction
00 2004
0012
0012
00 2004
00 2010
0100 (DL = 1)
0080 (DA = 1)
; Initiate DO loop (W7 reps)
; First instruction in loop
W1, [W2++] ; Last instruction in loop
PC
W7
DCOUNT
DOSTART
DOEND
CORCON
SR
After
Instruction
00 2004
E00F
200F
00 2004
00 2010
0100 (DL = 1)
0080 (DA = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
ED
Euclidean Distance (No Accumulate)
Syntax:
{label:} ED
Wm * Wm, Acc,
[Wx],
[Wy],
Wxd
[Wx] + = kx, [Wy] + = ky,
[Wx] – = kx, [Wy] – = ky,
[W9 + W12], [W11 + W12],
Operands:
Acc ∈ [A,B]
Wm * Wm ∈ [W4 * W4, W5 * W5, W6 * W6, W7 * W7]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]
Wxd ∈ [W4 ... W7]
Operation:
(Wm) * (Wm) → Acc(A or B)
([Wx] – [Wy]) → Wxd
(Wx) + kx → Wx
(Wy) + ky → Wy
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
1111
Description:
00mm
A1xx
00ii
iijj
jj11
Compute the square of Wm, and optionally compute the difference of the
prefetch values specified by [Wx] and [Wy]. The results of Wm * Wm are
sign-extended to 40 bits and stored in the specified accumulator. The
results of [Wx] – [Wy] are stored in Wxd, which may be the same as Wm.
Operands Wx, Wxd and Wyd specify the prefetch operations which
support indirect and register offset addressing as described in
Section 4.14.1 “MAC Prefetches”.
The ‘m’ bits select the operand register Wm for the square.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch difference Wxd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Words:
1
Cycles:
1
Example 1:
ED
© 2005 Microchip Technology Inc.
Before
Instruction
009A
1100
2300
00 3D0A 0000
007F
0028
0000
Preliminary
W4
W8
W10
ACCA
Data 1100
Data 2300
SR
Square W4 to ACCA
[W8]-[W10] to W4
Post-increment W8
Post-decrement W10
After
Instruction
0057
1102
22FE
00 0000 5CA4
007F
0028
0000
DS70157B-page 5-111
5
Instruction
Descriptions
W4
W8
W10
ACCA
Data 1100
Data 2300
SR
W4*W4, A, [W8]+=2, [W10]-=2, W4;
;
;
;
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
ED
W5
W9
W11
W12
ACCB
Data 1200
Data 2508
SR
DS70157B-page 5-112
W5*W5, B, [W9]+=2, [W11+W12], W5
Before
Instruction
43C2
1200
2500
0008
00 28E3 F14C
6A7C
2B3D
0000
Preliminary
W5
W9
W11
W12
ACCB
Data 1200
Data 2508
SR
; Square W5 to ACCB
; [W9]-[W11+W12] to W5
; Post-increment W9
After
Instruction
3F3F
1202
2500
0008
00 11EF 1F04
6A7C
2B3D
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
EDAC
Syntax:
Euclidean Distance
{label:} EDAC
Wm * Wm, Acc,
[Wx],
[Wy],
Wxd
[Wx] + = kx, [Wy] + = ky,
[Wx] – = kx, [Wy] – = ky,
[W9 + W12], [W11 + W12],
Operands:
Acc ∈ [A,B]
Wm * Wm ∈ [W4 * W4, W5 * W5, W6 * W6, W7 * W7]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]
Wxd ∈ [W4 ... W7]
Operation:
(Acc(A or B)) + (Wm) * (Wm) → Acc(A or B)
([Wx] – [Wy]) → Wxd
(Wx) + kx → Wx
(Wy) + ky → Wy
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
1111
Description:
00mm
A1xx
00ii
iijj
jj10
Compute the square of Wm, and also the difference of the prefetch values
specified by [Wx] and [Wy]. The results of Wm * Wm are sign-extended to
40 bits and added to the specified accumulator. The results of [Wx] – [Wy]
are stored in Wxd, which may be the same as Wm.
Operands Wx, Wxd and Wyd specify the prefetch operations which
support indirect and register offset addressing as described in
Section 4.14.1 “MAC Prefetches”.
The ‘m’ bits select the operand register Wm for the square.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch difference Wxd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Words:
1
Cycles:
1
Example 1:
EDAC
© 2005 Microchip Technology Inc.
Before
Instruction
009A
1100
2300
00 3D0A 3D0A
007F
0028
0000
Preliminary
W4
W8
W10
ACCA
Data 1100
Data 2300
SR
;
;
;
;
;
Square W4 and
add to ACCA
[W8]-[W10] to W4
Post-increment W8
Post-decrement W10
After
Instruction
0057
1102
22FE
00 3D0A 99AE
007F
0028
0000
DS70157B-page 5-113
5
Instruction
Descriptions
W4
W8
W10
ACCA
Data 1100
Data 2300
SR
W4*W4, A, [W8]+=2, [w10]-=2, W4
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
EDAC W5*W5, B, [w9]+=2, [W11+W12], W5
W5
W9
W11
W12
ACCB
Data 1200
Data 2508
SR
DS70157B-page 5-114
Before
Instruction
43C2
1200
2500
0008
00 28E3 F14C
6A7C
2B3D
0000
Preliminary
W5
W9
W11
W12
ACCB
Data 1200
Data 2508
SR
;
;
;
;
Square W5 and
add to ACCB
[W9]-[W11+W12] to W5
Post-increment W9
After
Instruction
3F3F
1202
2500
0008
00 3AD3 1050
6A7C
2B3D
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
EXCH
Exchange Wns and Wnd
Syntax:
{label:}
Operands:
Wns ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
(Wns) ↔ (Wnd)
Status Affected:
None
Encoding:
EXCH
1111
Description:
1101
Wns,
0000
Wnd
0ddd
d000
ssss
Exchange the word contents of two working registers. Register direct
addressing must be used for Wns and Wnd.
The ‘d’ bits select the address of the first register.
The ‘s’ bits select the address of the second register.
Note:
Words:
1
Cycles:
1
Example 1:
EXCH
W1
W9
SR
Example 2:
EXCH
W4
W5
SR
This instruction only executes in Word mode.
W1, W9
; Exchange the contents of W1 and W9
Before
Instruction
55FF
A3A3
0000
W4, W5
After
Instruction
W1
A3A3
W9
55FF
SR
0000
; Exchange the contents of W4 and W5
Before
Instruction
ABCD
4321
0000
After
Instruction
W4
4321
W5
ABCD
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-115
dsPIC30F/33F Programmer’s Reference Manual
FBCL
Syntax:
Find First Bit Change from Left
{label:}
FBCL
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
Max_Shift = 15
Sign = (Ws) & 0x8000
Temp = (Ws) << 1
Shift = 0
While ( (Shift < Max_Shift) && ( (Temp & 0x8000) == Sign) )
Temp = Temp << 1
Shift = Shift + 1
-Shift → (Wnd)
Status Affected:
C
Encoding:
Description:
1101
1111
0000
0ddd
dppp
ssss
Find the first occurrence of a one (for a positive value), or zero (for a
negative value), starting from the Most Significant bit after the sign bit of
Ws and working towards the Least Significant bit of the word operand. The
bit number result is sign-extended to 16 bits and placed in Wnd.
The next Most Significant bit after the sign bit is allocated bit number 0 and
the Least Significant bit is allocated bit number -14. This bit ordering
allows for the immediate use of Wd with the SFTAC instruction for scaling
values up. If a bit change is not found, a result of -15 is returned and the C
flag is set. When a bit change is found, the C flag is cleared.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
FBCL
W1, W9
Before
Instruction
W1
55FF
W9
FFFF
SR
0000
DS70157B-page 5-116
This instruction operates in Word mode only.
; Find 1st bit change from left in W1
; and store result to W9
After
Instruction
W1
55FF
W9
0000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
FBCL
W1, W9
Before
Instruction
W1 FFFF
W9 BBBB
SR
0000
Example 3:
FBCL
; Find 1st bit change from left in W1
; and store result to W9
After
Instruction
W1 FFFF
W9 FFF1
SR 0001 (C = 1)
[W1++], W9
Before
Instruction
W1
2000
W9 BBBB
Data 2000
FF0A
SR
0000
; Find 1st bit change from left in [W1]
; and store result to W9
; Post-increment W1
After
Instruction
W1 2002
W9 FFF9
Data 2000 FF0A
SR 0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-117
dsPIC30F/33F Programmer’s Reference Manual
FF1L
Syntax:
Find First One from Left
{label:}
FF1L
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
Max_Shift = 17
Temp = (Ws)
Shift = 1
While ( (Shift < Max_Shift) && !(Temp & 0x8000) )
Temp = Temp << 1
Shift = Shift + 1
If (Shift == Max_Shift)
0 → (Wnd)
Else
Shift → (Wnd)
Status Affected:
C
Encoding:
Description:
1100
1111
1000
0ddd
dppp
ssss
Finds the first occurrence of a ‘1’ starting from the Most Significant bit of
Ws and working towards the Least Significant bit of the word operand.
The bit number result is zero-extended to 16 bits and placed in Wnd.
Bit numbering begins with the Most Significant bit (allocated number 1)
and advances to the Least Significant bit (allocated number 16). A result
of zero indicates a ‘1’ was not found, and the C flag will be set. If a ‘1’ is
found, the C flag is cleared.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
FF1L
W2, W5
This instruction operates in Word mode only.
; Find the 1st one from the left in W2
; and store result to W5
Before
Instruction
W2
000A
W5 BBBB
SR
0000
DS70157B-page 5-118
Preliminary
After
Instruction
W2
000A
W5
000D
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
FF1L
[W2++], W5
Before
Instruction
W2
2000
W5 BBBB
Data 2000
0000
SR
0000
; Find the 1st one from the left in [W2]
; and store the result to W5
; Post-increment W2
After
Instruction
W2
2002
W5
0000
Data 2000
0000
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-119
dsPIC30F/33F Programmer’s Reference Manual
FF1R
Syntax:
Find First One from Right
{label:}
FF1R
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
Max_Shift = 17
Temp = (Ws)
Shift = 1
While ( (Shift < Max_Shift) && !(Temp & 0x1) )
Temp = Temp >> 1
Shift = Shift + 1
If (Shift == Max_Shift)
0 → (Wnd)
Else
Shift → (Wnd)
Status Affected:
C
Encoding:
Description:
1100
1111
0000
0ddd
dppp
ssss
Finds the first occurrence of a ‘1’ starting from the Least Significant bit of
Ws and working towards the Most Significant bit of the word operand. The
bit number result is zero-extended to 16 bits and placed in Wnd.
Bit numbering begins with the Least Significant bit (allocated number 1)
and advances to the Most Significant bit (allocated number 16). A result of
zero indicates a ‘1’ was not found, and the C flag will be set. If a ‘1’ is
found, the C flag is cleared.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
FF1R
W1, W9
This instruction operates in Word mode only.
; Find the 1st one from the right in W1
; and store the result to W9
Before
Instruction
W1
000A
W9 BBBB
SR
0000
DS70157B-page 5-120
Preliminary
After
Instruction
W1
000A
W9
0002
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
FF1R
[W1++], W9
Before
Instruction
W1
2000
W9 BBBB
Data 2000
8000
SR
0000
; Find the 1st one from the right in [W1]
; and store the result to W9
; Post-increment W1
After
Instruction
W1
2002
W9
0010
Data 2000
8000
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-121
dsPIC30F/33F Programmer’s Reference Manual
GOTO
Unconditional Jump
Syntax:
{label:}
GOTO
Expr
Operands:
Expr may be label or expression (but not a literal).
Expr is resolved by the linker to a lit23, where lit23 ∈ [0 ... 8388606].
Operation:
lit23 → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
1st word
2nd word
Description:
0000
0100
nnnn
nnnn
nnnn
nnn0
0000
0000
0000
0000
0nnn
nnnn
Unconditional jump to anywhere within the 4M instruction word program
memory range. The PC is loaded with the 23-bit literal specified in the
instruction. Since the PC must always reside on an even address boundary,
lit23<0> is ignored.
The ‘n’ bits form the target address.
Note:
Words:
2
Cycles:
2
Example 1:
026000
GOTO
026004
MOV
.
...
.
...
027844 _THERE: MOV
027846
...
PC
SR
Example 2:
_THERE
W0, W1
; Jump to _THERE
#0x400, W2
Before
Instruction
02 6000
0000
000100 _code:
.
026000
026004
PC
SR
DS70157B-page 5-122
The linker will resolve the specified expression into the lit23 to be
used.
PC
SR
...
...
GOTO
...
Before
Instruction
02 6000
0000
Preliminary
; Code execution
; resumes here
After
Instruction
02 7844
0000
; start of code
_code+2
PC
SR
; Jump to _code+2
After
Instruction
00 0102
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
GOTO
Unconditional Indirect Jump
Syntax:
{label:}
Operands:
Wn ∈ [W0 ... W15]
Operation:
0 → PC<22:16>
(Wn<15:1>) → PC<15:1>
0 → PC<0>
NOP → Instruction Register
Status Affected:
None
Encoding:
GOTO
0000
Description:
Wn
0001
0100
0000
0000
ssss
Unconditional indirect jump within the first 32K words of program memory.
Zero is loaded into PC<22:16> and the value specified in (Wn) is loaded
into PC<15:1>. Since the PC must always reside on an even address
boundary, Wn<0> is ignored.
The ‘s’ bits select the source register.
Words:
1
Cycles:
2
Example 1:
006000
GOTO
006002
MOV
.
...
.
...
007844 _THERE: MOV
007846
...
W4
PC
SR
W4
W0, W1
#0x400, W2
Before
Instruction
7844
00 6000
0000
W4
PC
SR
; Jump unconditionally
; to 16-bit value in W4
; Code execution
; resumes here
After
Instruction
7844
00 7844
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-123
dsPIC30F/33F Programmer’s Reference Manual
INC
Increment f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) + 1 → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
INC{.B}
1110
Description:
f
1100
{,WREG}
0BDf
ffff
ffff
ffff
Add one to the contents of the file register and place the result in the
destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG. If
WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
INC.B
0x1000
Before
Instruction
Data 1000
8FFF
SR
0000
Example 2:
INC
After
Instruction
Data 1000
8F00
SR
0101 (DC, C = 1)
0x1000, WREG
Before
Instruction
WREG ABCD
Data 1000 8FFF
SR
0000
DS70157B-page 5-124
; Increment 0x1000 (Byte mode)
; Increment 0x1000 and store to WREG
; (Word mode)
After
Instruction
WREG
9000
Data 1000
8FFF
SR
0108 (DC, N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
INC
Increment Ws
Syntax:
{label:}
INC{.B}
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) + 1 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
1000
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
0Bqq
qddd
dppp
ssss
Add one to the contents of the source register Ws and place the result in
the destination register Wd. Register direct or indirect addressing may be
used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
INC.B
W1, [++W2]
Before
Instruction
W1
FF7F
W2
2000
Data 2000 ABCD
SR
0000
Example 2:
INC
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W1, W2
; Pre-increment W2
; Increment W1 and store to W2
; (Byte mode)
After
Instruction
W1
FF7F
W2
2001
Data 2000
80CD
SR
010C (DC, N, OV = 1)
; Increment W1 and store to W2
; (Word mode)
© 2005 Microchip Technology Inc.
Preliminary
5
After
Instruction
W1
FF7F
W2
FF80
SR
0108 (DC, N = 1)
Instruction
Descriptions
Before
Instruction
W1
FF7F
W2
2000
SR
0000
DS70157B-page 5-125
dsPIC30F/33F Programmer’s Reference Manual
INC2
Syntax:
Increment f by 2
{label:}
INC2{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) + 2 → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1110
1100
1BDf
ffff
ffff
ffff
Add two to the contents of the file register and place the result in the
destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG. If
WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note:
Words:
1
Cycles:
1
Example 1:
INC2.B
0x1000
Before
Instruction
Data 1000
8FFF
SR
0000
Example 2:
INC2
; Increment 0x1000 by 2
; (Byte mode)
After
Instruction
Data 1000
8F01
SR
0101 (DC, C = 1)
0x1000, WREG
Before
Instruction
WREG ABCD
Data 1000
8FFF
SR
0000
DS70157B-page 5-126
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Increment 0x1000 by 2 and store to WREG
; (Word mode)
After
Instruction
WREG
9001
Data 1000
8FFF
SR
0108 (DC, N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
INC2
Syntax:
Increment Ws by 2
{label:}
Operands:
INC2{.B}
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) + 2 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
Ws,
1110
1000
1Bqq
qddd
dppp
ssss
Add two to the contents of the source register Ws and place the result in the
destination register Wd. Register direct or indirect addressing may be used
for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
INC2.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W1, [++W2]
Before
Instruction
W1
FF7F
W2
2000
Data 2000 ABCD
SR
0000
Example 2:
INC2
W1, W2
; Pre-increment W2
; Increment by 2 and store to W1
; (Byte mode)
After
Instruction
W1
FF7F
W2
2001
Data 2000
81CD
SR
010C (DC, N, OV = 1)
; Increment W1 by 2 and store to W2
; (word mode)
© 2005 Microchip Technology Inc.
Preliminary
5
After
Instruction
W1
FF7F
W2
FF81
SR
0108 (DC, N = 1)
Instruction
Descriptions
Before
Instruction
W1
FF7F
W2
2000
SR
0000
DS70157B-page 5-127
dsPIC30F/33F Programmer’s Reference Manual
IOR
Inclusive OR f and WREG
{label:}
IOR{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f).IOR.(WREG) → destination designated by D
Status Affected:
N, Z
Encoding:
1011
Description:
0111
0BDf
ffff
ffff
ffff
Compute the logical inclusive OR operation of the contents of the working
register WREG and the contents of the file register and place the result in
the destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG. If
WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
IOR.B
0x1000
Before
Instruction
WREG
1234
Data 1000
FF00
SR
0000
Example 2:
IOR
; IOR WREG to (0x1000) (Byte mode)
; (Byte mode)
After
Instruction
WREG
1234
Data 1000
FF34
SR
0000
0x1000, WREG
; IOR (0x1000) to WREG
; (Word mode)
Before
After
Instruction
Instruction
WREG
1234
WREG
1FBF
Data 1000
0FAB
Data 1000
0FAB
SR
0008 (N = 1)
SR
0000
DS70157B-page 5-128
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
IOR
Inclusive OR Literal and Wn
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
lit10.IOR.(Wn) → Wn
Status Affected:
N, Z
Encoding:
IOR{.B}
1011
Description:
#lit10,
0011
0Bkk
Wn
kkkk
kkkk
dddd
Compute the logical inclusive OR operation of the 10-bit literal operand
and the contents of the working register Wn and place the result back into
the working register Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an unsigned
value [0:255]. See Section 4.6 “Using 10-bit Literal Operands” for information on using 10-bit literal operands in Byte
mode.
Words:
1
Cycles:
1
Example 1:
IOR.B #0xAA, W9
; IOR 0xAA to W9
; (Byte mode)
Before
Instruction
W9
1234
SR
0000
Example 2:
IOR
#0x2AA, W4
After
Instruction
W9
12BE
SR
0008 (N = 1)
; IOR 0x2AA to W4
; (Word mode)
Before
Instruction
W4
A34D
SR
0000
After
Instruction
W4
A3EF
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-129
dsPIC30F/33F Programmer’s Reference Manual
IOR
Inclusive OR Wb and Short Literal
Syntax:
{label:}
IOR{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb).IOR.lit5 → Wd
Status Affected:
N, Z
Encoding:
Description:
0111
0www
wBqq
qddd
d11k
kkkk
Compute the logical inclusive OR operation of the contents of the base
register Wb and the 5-bit literal operand and place the result in the
destination register Wd. Register direct addressing must be used for Wb.
Either register direct or indirect addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
IOR.B
W1, #0x5, [W9++]
Before
Instruction
W1 AAAA
W9
2000
Data 2000
0000
SR
0000
Example 2:
IOR
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
After
Instruction
W1 AAAA
W9
2001
Data 2000
00AF
SR
0008 (N = 1)
W1, #0x0, W9
; IOR W1 with 0x0 (Word mode)
; Store to W9
Before
Instruction
W1
0000
W9
A34D
SR
0000
DS70157B-page 5-130
; IOR W1 and 0x5 (Byte mode)
; Store to [W9]
; Post-increment W9
Preliminary
After
Instruction
W1
0000
W9
0000
SR
0002 (Z = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
IOR
Inclusive OR Wb and Ws
Syntax:
{label:}
IOR{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb).IOR.(Ws) → Wd
Status Affected:
N, Z
Encoding:
Description:
0111
0www
Wb,
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Compute the logical inclusive OR operation of the contents of the source
register Ws and the contents of the base register Wb and place the result in
the destination register Wd. Register direct addressing must be used for Wb.
Either register direct or indirect addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
IOR.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W1, [W5++], [W9++]
Before
Instruction
W1 AAAA
W5
2000
W9
2400
Data 2000
1155
Data 2400
0000
SR
0000
; IOR W1 and [W5] (Byte mode)
; Store result to [W9]
; Post-increment W5 and W9
After
Instruction
W1 AAAA
W5
2001
W9
2401
Data 2000
1155
Data 2400
00FF
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-131
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
IOR
W1, W5, W9
Before
Instruction
W1 AAAA
W5
5555
W9
A34D
SR
0000
DS70157B-page 5-132
Preliminary
; IOR W1 and W5 (Word mode)
; Store the result to W9
After
Instruction
W1 AAAA
W5
5555
W9
FFFF
SR
0008 (N = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
LAC
Load Accumulator
Syntax:
{label:}
LAC
Ws,
{#Slit4,}
Acc
[Ws],
[Ws++],
[Ws--],
[--Ws],
[++Ws],
[Ws+Wb],
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Slit4 ∈ [-8 ... +7]
Acc ∈ [A,B]
Operation:
ShiftSlit4(Extend(Ws)) → Acc(A or B)
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1100
1010
Awww
wrrr
rggg
ssss
Read the contents of the source register, optionally perform a signed 4-bit
shift and store the result in the specified accumulator. The shift range is -8:7,
where a negative operand indicates an arithmetic left shift and a positive
operand indicates an arithmetic right shift. The data stored in the source
register is assumed to be 1.15 fractional data and is automatically
sign-extended (through bit 39) and zero-backfilled (bits [15:0]), prior to
shifting.
The ‘A’ bit specifies the destination accumulator.
The ‘w’ bits specify the offset register Wb.
The ‘r’ bits encode the accumulator pre-shift.
The ‘g’ bits select the source Address mode.
The ‘s’ bits specify the source register Ws.
Note:
Words:
1
Cycles:
1
Example 1:
LAC
W4
ACCB
Data 2000
SR
If the operation moves more than sign-extension data into the
upper Accumulator register (AccxU), or causes a saturation, the
appropriate overflow and saturation bits will be set.
[W4++], #-3, B
Before
Instruction
2000
00 5125 ABCD
1221
0000
;
;
;
;
;
Load ACCB with [W4] << 3
Contents of [W4] do not change
Post increment W4
Assume saturation disabled
(SATB = 0)
W4
ACCB
Data 2000
SR
After
Instruction
2002
FF 9108 0000
1221
4800 (OB, OAB = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-133
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
LAC
W2
ACCA
Data 4000
Data 4002
SR
DS70157B-page 5-134
[--W2], #7, A
Before
Instruction
4002
00 5125 ABCD
9108
1221
0000
Preliminary
;
;
;
;
;
Pre-decrement W2
Load ACCA with [W2] >> 7
Contents of [W2] do not change
Assume saturation disabled
(SATA = 0)
W2
ACCA
Data 4000
Data 4002
SR
After
Instruction
4000
FF FF22 1000
9108
1221
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
LNK
Allocate Stack Frame
Syntax:
{label:}
Operands:
lit14 ∈ [0 ... 16382]
Operation:
(W14) → (TOS)
(W15) + 2 → W15
(W15) → W14
(W15) + lit14 → W15
Status Affected:
None
Encoding:
1111
Description:
LNK
1010
#lit14
00kk
kkkk
kkkk
kkk0
This instruction allocates a Stack Frame of size lit14 bytes for a subroutine calling sequence. The Stack Frame is allocated by PUSHing the contents of the Frame Pointer (W14) onto the stack, storing the updated
Stack Pointer (W15) to the Frame Pointer and then incrementing the
Stack Pointer by the unsigned 14-bit literal operand. This instruction
supports a maximum Stack Frame of 16382 bytes.
The ‘k’ bits specify the size of the Stack Frame.
Note:
Words:
1
Cycles:
1
Example 1:
LNK
W14
W15
Data 2000
SR
#0xA0
Since the Stack Pointer can only reside on a word boundary,
lit14 must be even.
; Allocate a stack frame of 160 bytes
Before
Instruction
2000
2000
0000
0000
W14
W15
Data 2000
SR
After
Instruction
2002
20A2
2000
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-135
dsPIC30F/33F Programmer’s Reference Manual
LSR
Logical Shift Right f
Syntax:
{label:}
LSR{.B}
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
0 → Dest<7>
(f<7:1>) → Dest<6:0>
(f<0>) → C
For word operation:
0 → Dest<15>
(f<15:1>) → Dest<14:0>
(f<0>) → C
N, Z, C
Encoding:
1101
Description:
{,WREG}
C
0
Status Affected:
f
0101
0BDf
ffff
ffff
ffff
Shift the contents of the file register one bit to the right and place the result
in the destination register. The Least Significant bit of the file register is
shifted into the Carry bit of the STATUS register. Zero is shifted into the
Most Significant bit of the destination register.
The optional WREG operand determines the destination register. If WREG
is specified, the result is stored in WREG. If WREG is not specified, the
result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
LSR.B
0x600
; Logically shift right (0x600) by one
; (Byte mode)
Before
Instruction
Data 600
55FF
SR
0000
Example 2:
LSR
0x600, WREG
Before
Instruction
Data 600
55FF
WREG
0000
SR
0000
DS70157B-page 5-136
After
Instruction
Data 600
557F
SR
0001 (C = 1)
; Logically shift right (0x600) by one
; Store to WREG
; (Word mode)
After
Instruction
Data 600
55FF
WREG
2AFF
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
LSR
Syntax:
Logical Shift Right Ws
{label:}
LSR{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
0 → Wd<7>
(Ws<7:1>) → Wd<6:0>
(Ws<0>) → C
For word operation:
0 → Wd<15>
(Ws<15:1>) → Wd<14:0>
(Ws<0>) → C
C
0
Status Affected:
N, Z, C
Encoding:
Description:
1101
0001
0Bqq
qddd
dppp
ssss
Shift the contents of the source register Ws one bit to the right and place
the result in the destination register Wd. The Least Significant bit of Ws is
shifted into the Carry bit of the STATUS register. Zero is shifted into the
Most Significant bit of Wd. Either register direct or indirect addressing
may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
LSR.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W1
; LSR W0 (Byte mode)
; Store result to W1
© 2005 Microchip Technology Inc.
Preliminary
After
Instruction
W0
FF03
W1
2301
SR
0001 (C = 1)
5
Instruction
Descriptions
Before
Instruction
W0
FF03
W1
2378
SR
0000
DS70157B-page 5-137
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
LSR
W0, W1
; LSR W0 (Word mode)
; Store the result to W1
Before
Instruction
W0
8000
W1
2378
SR
0000
DS70157B-page 5-138
Preliminary
After
Instruction
W0
8000
W1
4000
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
LSR
Logical Shift Right by Short Literal
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit4 ∈ [0 ... 15]
Wnd ∈ [W0 ... W15]
Operation:
lit4<3:0> → Shift_Val
0 → Wnd<15:15-Shift_Val + 1>
Wb<15:Shift_Val> → Wnd<15-Shift_Val:0>
Status Affected:
N, Z
Encoding:
1101
Description:
LSR
1110
Wb,
0www
#lit4,
Wnd
wddd
d100
kkkk
Logical shift right the contents of the source register Wb by the 4-bit
unsigned literal and store the result in the destination register Wnd.
Direct addressing must be used for Wb and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand.
Note:
Words:
1
Cycles:
1
Example 1:
Example 2:
LSR
This instruction operates in Word mode only.
W4, #14, W5
; LSR W4 by 14
; Store result to W5
Before
Instruction
W4
C800
W5
1200
SR
0000
After
Instruction
W4
C800
W5
0003
SR
0000
LSR
; LSR W4 by 1
; Store result to W5
W4, #1, W5
Before
Instruction
W4
0505
W5
F000
SR
0000
After
Instruction
W4
0505
W5
0282
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-139
dsPIC30F/33F Programmer’s Reference Manual
LSR
Logical Shift Right by Wns
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wns ∈ [W0 ...W15]
Wnd ∈ [W0 ... W15]
Operation:
Wns<4:0> → Shift_Val
0 → Wnd<15:15-Shift_Val + 1>
Wb<15:Shift_Val> → Wnd<15 - Shift_Val:0>
Status Affected:
N, Z
Encoding:
1101
Description:
LSR
1110
Wb,
0www
Wns,
Wnd
wddd
d000
ssss
Logical shift right the contents of the source register Wb by the 5 Least
Significant bits of Wns (only up to 15 positions) and store the result in the
destination register Wnd. Direct addressing must be used for Wb and
Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: If Wns is greater than 15, Wnd will be loaded with 0x0.
Words:
1
Cycles:
1
Example 1:
Example 2:
LSR
W0, W1, W2
Before
Instruction
W0
C00C
W1
0001
W2
2390
SR
0000
After
Instruction
W0
C00C
W1
0001
W2
6006
SR
0000
LSR
; LSR W5 by W4
; Store result to W3
W5, W4, W3
Before
Instruction
W3
DD43
W4
000C
W5
0800
SR
0000
DS70157B-page 5-140
; LSR W0 by W1
; Store result to W2
Preliminary
After
Instruction
W3
0000
W4
000C
W5
0800
SR
0002 (Z = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MAC
Syntax:
Multiply and Accumulate
{label:} MAC
Wm*Wn, Acc {,[Wx], Wxd}
{,[Wy], Wyd}
{,AWB}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wn ∈ [W4 * W5, W4 * W6, W4 * W7, W5 * W6, W5 * W7, W6 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
AWB ∈ [W13, [W13] + = 2]
Operation:
(Acc(A or B)) + (Wm) * (Wn) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
(Acc(B or A)) rounded → AWB
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1100
0mmm
A0xx
yyii
iijj
jjaa
Multiply the contents of two working registers, optionally prefetch
operands in preparation for another MAC type instruction and optionally
store the unspecified accumulator results. The 32-bit result of the signed
multiply is sign-extended to 40 bits and added to the specified
accumulator.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations,
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”. Operand AWB specifies the optional
store of the “other” accumulator, as described in
Section 4.14.4 “MAC Write Back”.
The ‘m’ bits select the operand registers Wm and Wn for the multiply.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
The ‘a’ bits select the accumulator Write Back destination.
Note:
Words:
1
Cycles:
1
The IF bit, CORCON<0>, determines if the multiply is
fractional or an integer.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-141
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
MAC W4*W5, A, [W8]+=6, W4, [W10]+=2, W5
; Multiply W4*W5 and add to ACCA
; Fetch [W8] to W4, Post-increment W8 by 6
; Fetch [W10] to W5, Post-increment W10 by 2
; CORCON = 0x00C0 (fractional multiply, normal saturation)
W4
W5
W8
W10
ACCA
Data 0A00
Data 1800
CORCON
SR
Example 2:
W4
W5
W8
W10
ACCA
Data 0A00
Data 1800
CORCON
SR
After
Instruction
2567
909C
0A06
1802
00 472D 2400
2567
909C
00C0
0000
MAC W4*W5, A, [W8]-=2, W4, [W10]+=2, W5, W13
; Multiply W4*W5 and add to ACCA
; Fetch [W8] to W4, Post-decrement W8 by 2
; Fetch [W10] to W5, Post-increment W10 by 2
; Write Back ACCB to W13
; CORCON = 0x00D0 (fractional multiply, super saturation)
W4
W5
W8
W10
W13
ACCA
ACCB
Data 0A00
Data 1800
CORCON
SR
DS70157B-page 5-142
Before
Instruction
A022
B900
0A00
1800
00 1200 0000
2567
909C
00C0
0000
Before
Instruction
1000
3000
0A00
1800
2000
23 5000 2000
00 0000 8F4C
5BBE
C967
00D0
0000
Preliminary
W4
W5
W8
W10
W13
ACCA
ACCB
Data 0A00
Data 1800
CORCON
SR
After
Instruction
5BBE
C967
09FE
1802
0001
23 5600 2000
00 0000 1F4C
5BBE
C967
00D0
8800 (OA, OAB = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MAC
Syntax:
Square and Accumulate
{label:} MAC
Wm*Wm, Acc {,[Wx], Wxd}
{,[Wy], Wyd}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wm ∈ [W4 * W4, W5 * W5, W6 * W6, W7 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
Operation:
(Acc(A or B)) + (Wm) * (Wm) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1111
00mm
A0xx
yyii
iijj
jj00
Square the contents of a working register, optionally prefetch operands in
preparation for another MAC type instruction and optionally store the
unspecified accumulator results. The 32-bit result of the signed multiply is
sign-extended to 40 bits and added to the specified accumulator.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations,
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”.
The ‘m’ bits select the operand register Wm for the square.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Note:
Words:
1
Cycles:
1
The IF bit, CORCON<0>, determines if the multiply is fractional
or an integer.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-143
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
MAC W4*W4, B, [W9+W12], W4, [W10]-=2, W5
; Square W4 and add to ACCB
; Fetch [W9+W12] to W4
; Fetch [W10] to W5, Post-decrement W10 by 2
; CORCON = 0x00C0 (fractional multiply, normal saturation)
W4
W5
W9
W10
W12
ACCB
Data 0C20
Data 1900
CORCON
SR
Example 2:
W4
W5
W9
W10
W12
ACCB
Data 0C20
Data 1900
CORCON
SR
After
Instruction
A230
650B
0C00
18FE
0020
00 67CD 0908
A230
650B
00C0
0000
MAC W7*W7, A, [W11]-=2, W7
; Square W7 and add to ACCA
; Fetch [W11] to W7, Post-decrement W11 by 2
; CORCON = 0x00D0 (fractional multiply, super saturation)
W7
W11
ACCA
Data 2000
CORCON
SR
DS70157B-page 5-144
Before
Instruction
A022
B200
0C00
1900
0020
00 2000 0000
A230
650B
00C0
0000
Before
Instruction
76AE
2000
FE 9834 4500
23FF
00D0
0000
Preliminary
W7
W11
ACCA
Data 2000
CORCON
SR
After
Instruction
23FF
1FFE
FF 063E 0188
23FF
00D0
8800 (OA, OAB = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV
Move f to Destination
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) → destination designated by D
Status Affected:
N, Z
Encoding:
1011
Description:
MOV{.B}
1111
f
{,WREG}
1BDf
ffff
ffff
ffff
Move the contents of the specified file register to the destination register.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored back to the file register and the only effect is
to modify the STATUS register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: When moving word data from file register memory, the “MOV f
to Wnd” (page 5-147) instruction allows any working register
(W0:W15) to be the destination register.
Words:
1
Cycles:
1
Example 1:
MOV.B
TMR0, WREG
Before
Instruction
WREG (W0)
9080
TMR0
2355
SR
0000
Example 2:
MOV
0x800
Before
Instruction
Data 0800 B29F
SR
0000
; move (TMR0) to WREG (Byte mode)
After
Instruction
WREG (W0)
9055
TMR0
2355
SR
0000
; update SR based on (0x800) (Word mode)
After
Instruction
Data 0800 B29F
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-145
dsPIC30F/33F Programmer’s Reference Manual
MOV
Move WREG to f
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(WREG) → f
Status Affected:
None
Encoding:
1011
Description:
MOV{.B}
0111
WREG,
f
1B1f
ffff
ffff
ffff
Move the contents of the default working register WREG into the
specified file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
2: The WREG is set to working register W0.
3: When moving word data from the working register array to file
register memory, the “MOV Wns to f” (page 5-148) instruction allows any working register (W0:W15) to be the source
register.
Words:
1
Cycles:
1
Example 1:
MOV.B
WREG, 0x801
Before
Instruction
WREG (W0)
98F3
Data 0800
4509
SR
0000
Example 2:
MOV
DS70157B-page 5-146
After
Instruction
WREG (W0)
98F3
Data 0800
F309
SR
0008 (N = 1)
WREG, DISICNT
Before
Instruction
WREG (W0)
00A0
DISICNT
0000
SR
0000
; move WREG to 0x801 (Byte mode)
; move WREG to DISICNT
After
Instruction
WREG (W0)
00A0
DISICNT
00A0
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV
Move f to Wnd
Syntax:
{label:}
Operands:
f ∈ [0 ... 65534]
Wnd ∈ [W0 ... W15]
Operation:
(f) → Wnd
Status Affected:
None
Encoding:
1000
Description:
MOV
f,
0fff
Wnd
ffff
ffff
ffff
dddd
Move the word contents of the specified file register to Wnd. The file
register may reside anywhere in the 32K words of data memory, but must
be word-aligned. Register direct addressing must be used for Wnd.
The ‘f’ bits select the address of the file register.
The ‘d’ bits select the destination register.
Note 1: This instruction only operates on word operands.
2: Since the file register address must be word-aligned, only the
upper 15 bits of the file register address are encoded (bit 0 is
assumed to be ‘0’).
3: To move a byte of data from file register memory, the “MOV f
to Destination” instruction (page 5-145) may be used.
Words:
1
Cycles:
1
Example 1:
MOV
CORCON, W12
Before
Instruction
W12
78FA
CORCON
00F0
SR
0000
Example 2:
MOV
After
Instruction
W12
00F0
CORCON
00F0
SR
0000
0x27FE, W3
Before
Instruction
W3
0035
Data 27FE ABCD
SR
0000
; move CORCON to W12
; move (0x27FE) to W3
After
Instruction
W3 ABCD
Data 27FE ABCD
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-147
dsPIC30F/33F Programmer’s Reference Manual
MOV
Move Wns to f
Syntax:
{label:}
Operands:
f ∈ [0 ... 65534]
Wns ∈ [W0 ... W15]
Operation:
(Wns) → f
Status Affected:
None
Encoding:
MOV
1000
Description:
1fff
Wns,
f
ffff
ffff
ffff
ssss
Move the word contents of the working register Wns to the specified file
register. The file register may reside anywhere in the 32K words of data
memory, but must be word-aligned. Register direct addressing must be
used for Wn.
The ‘f’ bits select the address of the file register.
The ‘s’ bits select the source register.
Note 1: This instruction only operates on word operands.
2: Since the file register address must be word-aligned, only the
upper 15 bits of the file register address are encoded (bit 0 is
assumed to be ‘0’).
3: To move a byte of data to file register memory, the “MOV WREG
to f” instruction (page 5-146) may be used.
Words:
1
Cycles:
1
Example 1:
MOV
W4, XMDOSRT
Before
Instruction
W4
1200
XMODSRT
1340
SR
0000
Example 2:
MOV
DS70157B-page 5-148
After
Instruction
W4
1200
XMODSRT
1200
SR
0000
W8, 0x1222
Before
Instruction
W8
F200
Data 1222
FD88
SR
0000
; move W4 to XMODSRT
; move W8 to data address 0x1222
After
Instruction
W8
F200
Data 1222
F200
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV.B
Move 8-bit Literal to Wnd
Syntax:
{label:}
Operands:
lit8 ∈ [0 ... 255]
Wnd ∈ [W0 ... W15]
Operation:
lit8 → Wnd
Status Affected:
None
Encoding:
Description:
MOV.B
1011
0011
#lit8,
Wnd
1100
kkkk
kkkk
dddd
The unsigned 8-bit literal ‘k’ is loaded into the lower byte of Wnd. The
upper byte of Wnd is not changed. Register direct addressing must be
used for Wnd.
The ‘k’ bits specify the value of the literal.
The ‘d’ bits select the address of the working register.
Note:
Words:
1
Cycles:
1
Example 1:
Example 2:
MOV.B
This instruction operates in Byte mode and the .B extension
must be provided.
#0x17, W5
; load W5 with #0x17 (Byte mode)
Before
Instruction
W5
7899
SR
0000
After
Instruction
W5
7817
SR
0000
MOV.B
; load W9 with #0xFE (Byte mode)
#0xFE, W9
Before
Instruction
W9
AB23
SR
0000
After
Instruction
W9
ABFE
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-149
dsPIC30F/33F Programmer’s Reference Manual
MOV
Move 16-bit Literal to Wnd
Syntax:
{label:}
Operands:
lit16 ∈ [-32768 ... 65535]
Wnd ∈ [W0 ... W15]
Operation:
lit16 → Wnd
Status Affected:
None
Encoding:
MOV
0010
Description:
#lit16,
kkkk
Wnd
kkkk
kkkk
kkkk
dddd
The 16-bit literal ‘k’ is loaded into Wnd. Register direct addressing must
be used for Wnd.
The ‘k’ bits specify the value of the literal.
The ‘d’ bits select the address of the working register.
Note 1: This instruction operates only in Word mode.
2: The literal may be specified as a signed value [-32768:32767],
or unsigned value [0:65535].
Words:
1
Cycles:
1
Example 1:
MOV
#0x4231, W13
Before
Instruction
W13
091B
SR
0000
Example 2:
MOV
; load W13 with #0x4231
After
Instruction
W13
4231
SR
0000
#0x4, W2
Before
Instruction
W2
B004
SR
0000
Example 3:
MOV
#-1000, W8
Before
Instruction
W8
23FF
SR
0000
DS70157B-page 5-150
Preliminary
; load W2 with #0x4
After
Instruction
W2
0004
SR
0000
; load W8 with #-1000
After
Instruction
W8
FC18
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV
Move [Ws with offset] to Wnd
Syntax:
{label:}
Operands:
Ws ∈ [W0 ... W15]
Slit10 ∈ [-512 ... 511] for byte operation
Slit10 ∈ [-1024 ... 1022] (even only) for word operation
Wnd ∈ [W0 ... W15]
Operation:
[Ws + Slit10] → Wnd
Status Affected:
None
Encoding:
MOV{.B}
1001
Description:
0kkk
[Ws + Slit10], Wnd
kBkk
kddd
dkkk
ssss
The contents of [Ws + Slit10] are loaded into Wnd. In Word mode, the
range of Slit10 is increased to [-1024 ... 1022] and Slit10 must be even to
maintain word address alignment. Register indirect addressing must be
used for the source, and direct addressing must be used for Wnd.
The ‘k’ bits specify the value of the literal.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘d’ bits select the destination register.
The ‘s’ bits select the source register.
Note 1: The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
2: In Byte mode, the range of Slit10 is not reduced as specified in
Section 4.6 “Using 10-bit Literal Operands”, since the literal
represents an address offset from Ws.
Words:
1
Cycles:
1
Example 1:
MOV.B
[W8+0x13], W10
Before
Instruction
W8
1008
W10
4009
Data 101A
3312
SR
0000
Example 2:
MOV
After
Instruction
W8
1008
W10
4033
Data 101A
3312
SR
0000
[W4+0x3E8], W2
Before
Instruction
W2
9088
W4
0800
Data 0BE8
5634
SR
0000
; load W10 with [W8+0x13]
; (Byte mode)
; load W2 with [W4+0x3E8]
; (Word mode)
After
Instruction
W2
5634
W4
0800
Data 0BE8
5634
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-151
dsPIC30F/33F Programmer’s Reference Manual
MOV
Move Wns to [Wd with offset]
Syntax:
{label:}
Operands:
Wns ∈ [W0 ... W15]
Slit10 ∈ [-512 ... 511] in Byte mode
Slit10 ∈ [-1024 ... 1022] (even only) in Word mode
Wd ∈ [W0 ... W15]
Operation:
(Wns) → [Wd + Slit10]
Status Affected:
None
Encoding:
MOV{.B}
1001
Description:
1kkk
Wns,
[Wd + Slit10]
kBkk
kddd
dkkk
ssss
The contents of Wns are stored to [Wd + Slit10]. In Word mode, the range
of Slit10 is increased to [-1024 ... 1022] and Slit10 must be even to
maintain word address alignment. Register direct addressing must be
used for Wns, and indirect addressing must be used for the destination.
The ‘k’ bits specify the value of the literal.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘d’ bits select the destination register.
The ‘s’ bits select the address of the destination register.
Note 1: The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
2: In Byte mode, the range of Slit10 is not reduced as specified in
Section 4.6 “Using 10-bit Literal Operands”, since the literal
represents an address offset from Wd.
Words:
1
Cycles:
1
Example 1:
MOV.B
W0, [W1+0x7]
Before
Instruction
W0
9015
W1
1800
Data 1806
2345
SR
0000
Example 2:
MOV
DS70157B-page 5-152
After
Instruction
W0
9015
W1
1800
Data 1806
1545
SR
0000
W11, [W1-0x400]
Before
Instruction
W1
1000
W11
8813
Data 0C00
FFEA
SR
0000
; store W0 to [W1+0x7]
; (Byte mode)
; store W11 to [W1-0x400]
; (Word mode)
After
Instruction
W1
1000
W11
8813
Data 0C00
8813
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV
Syntax:
Move Ws to Wd
{label:}
MOV{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[--Ws],
[--Wd]
[++Ws],
[++Wd]
[Ws + Wb], [Wd + Wb]
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) → Wd
Status Affected:
None
Encoding:
Description:
0111
1www
wBhh
hddd
dggg
ssss
Move the contents of the source register into the destination register.
Either register direct or indirect addressing may be used for Ws and Wd.
The ‘w’ bits define the offset register Wb.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘h’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘g’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
2: When Register Offset Addressing mode is used for both the
source and destination, the offset must be the same because
the ‘w’ encoding bits are shared by Ws and Wd.
3: The instruction “PUSH Ws” translates to MOV Ws, [W15++].
4: The instruction “POP Wd” translates to MOV [--W15], Wd.
Words:
1
Cycles:
1
Example 1:
MOV.B
[W0--], W4
Before
Instruction
W0
0A01
W4
2976
Data 0A00
8988
SR
0000
; Move [W0] to W4 (Byte mode)
; Post-decrement W0
After
Instruction
W0
0A00
W4
2989
Data 0A00
8988
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-153
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MOV
[W6++], [W2+W3]
Before
Instruction
W2
0800
W3
0040
W6
1228
Data 0840
9870
Data 1228
0690
SR
0000
DS70157B-page 5-154
; Move [W6] to [W2+W3] (Word mode)
; Post-increment W6
After
Instruction
W2
0800
W3
0040
W6
122A
Data 0840
0690
Data 1228
0690
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV.D
Syntax:
double Word Move from Source to Wnd
{label:}
MOV.D
Wns,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Wns ∈ [W0, W2, W4 ... W14]
Ws ∈ [W0 ... W15]
Wnd ∈ [W0, W2, W4 ... W14]
Operation:
For direct addressing of source:
Wns → Wnd
Wns + 1 → Wnd + 1
For indirect addressing of source:
See Description
Status Affected:
None
Encoding:
Description:
1011
1110
0000
0ddd
0ppp
ssss
Move the double word specified by the source to a destination working
register pair (Wnd:Wnd + 1). If register direct addressing is used for the
source, the contents of two successive working registers (Wns:Wns + 1)
are moved to Wnd:Wnd + 1. If indirect addressing is used for the source,
Ws specifies the effective address for the least significant word of the double word. Any pre/post-increment or pre/post-decrement will adjust Ws by
4 bytes to accommodate for the double word.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the address of the first source register.
Note 1: This instruction only operates on double words. See Figure 4-2
for information on how double words are aligned in memory.
2: Wnd must be an even working register.
3: The instruction “POP.D Wnd” translates to MOV.D [--W15],
Wnd.
Words:
1
Cycles:
2
Example 1:
MOV.D
W2, W6
; Move W2 to W6 (Double mode)
© 2005 Microchip Technology Inc.
Preliminary
After
Instruction
W2
12FB
W3
9877
W6
12FB
W7
9877
SR
0000
5
Instruction
Descriptions
Before
Instruction
W2
12FB
W3
9877
W6
9833
W7
FCC6
SR
0000
DS70157B-page 5-155
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MOV.D
[W7--], W4
Before
Instruction
W4
B012
W5
FD89
W7
0900
Data 0900
A319
Data 0902
9927
SR
0000
DS70157B-page 5-156
; Move [W7] to W4 (Double mode)
; Post-decrement W7
After
Instruction
W4
A319
W5
9927
W7
08FC
Data 0900
A319
Data 0902
9927
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOV.D
double Word Move from Wns to Destination
Syntax:
{label:}
MOV.D
Wns,
Wnd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wns ∈ [W0, W2, W4 ... W14]
Wnd ∈ [W0, W2, W4 ... W14]
Wd ∈ [W0 ... W15]
Operation:
For direct addressing of destination:
Wns → Wnd
Wns + 1 → Wnd + 1
For indirect addressing of destination:
See Description
Status Affected:
None
Encoding:
Description:
1011
1110
10qq
qddd
d000
sss0
Move a double word (Wns:Wns + 1) to the specified destination. If register direct addressing is used for the destination, the contents of
Wns:Wns + 1 are stored to Wnd:Wnd + 1. If indirect addressing is used
for the destination, Wd specifies the effective address for the least significant word of the double word. Any pre/post-increment or pre/post-decrement will adjust Wd by 4 bytes to accommodate for the double word.
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘s’ bits select the address of the source register pair.
Note 1: This instruction only operates on double words. See
Figure 4-2 for information on how double words are aligned in
memory.
2: Wnd must be an even working register.
3: The instruction PUSH.D Ws translates to MOV.D Wns,
[W15++].
Words:
1
Cycles:
2
Example 1:
MOV.D
W10, W0
© 2005 Microchip Technology Inc.
After
Instruction
W0 CCFB
W1
0091
W10 CCFB
W11
0091
SR
0000
Preliminary
5
Instruction
Descriptions
Before
Instruction
W0
9000
W1
4322
W10 CCFB
W11
0091
SR
0000
; Move W10 to W0 (Double mode)
DS70157B-page 5-157
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MOV.D
W4, [--W6]
Before
Instruction
W4
100A
W5
CF12
W6
0804
Data 0800
A319
Data 0802
9927
SR
0000
DS70157B-page 5-158
; Pre-decrement W6 (Double mode)
; Move W4 to [W6]
After
Instruction
W4
100A
W5
CF12
W6
0800
Data 0800
100A
Data 0802
CF12
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MOVSAC
Syntax:
Prefetch Operands and Store Accumulator
{label:} MOVSAC
Acc
{,[Wx], Wxd}
{,[Wy], Wyd}
{,AWB}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
AWB ∈ [W13, [W13] + = 2]
Operation:
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
(Acc(B or A)) rounded → AWB
Status Affected:
None
Encoding:
1100
Description:
0111
A0xx
yyii
iijj
jjaa
Optionally prefetch operands in preparation for another MAC type instruction and optionally store the unspecified accumulator results. Even
though an accumulator operation is not performed in this instruction, an
accumulator must be specified to designate which accumulator to write
back.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”. Operand AWB specifies the optional
store of the “other” accumulator, as described in
Section 4.14.4 “MAC Write Back”.
The ‘A’ bit selects the other accumulator used for write back.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
The ‘a’ bits select the accumulator Write Back destination.
Words:
1
Cycles:
1
Example 1:
MOVSAC
; Fetch
; Fetch
; Store
© 2005 Microchip Technology Inc.
Before
Instruction
A022
B200
0800
1900
0020
00 3290 5968
7811
B2AF
0000
Preliminary
W6
W7
W9
W11
W13
ACCA
Data 0800
Data 1900
SR
After
Instruction
7811
B2AF
0800
1904
3290
00 3290 5968
7811
B2AF
0000
DS70157B-page 5-159
5
Instruction
Descriptions
W6
W7
W9
W11
W13
ACCA
Data 0800
Data 1900
SR
B, [W9], W6, [W11]+=4, W7, W13
[W9] to W6
[W11] to W7, Post-increment W11 by 4
ACCA to W13
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MOVSAC
; Fetch
; Fetch
; Store
W4
W6
W9
W11
W12
W13
ACCB
Data 1200
Data 2024
Data 2300
SR
DS70157B-page 5-160
A, [W9]-=2, W4, [W11+W12], W6, [W13]+=2
[W9] to W4, Post-decrement W9 by 2
[W11+W12] to W6
ACCB to [W13], Post-increment W13 by 2
Before
Instruction
76AE
2000
1200
2000
0024
2300
00 9834 4500
BB00
52CE
23FF
0000
Preliminary
W4
W6
W9
W11
W12
W13
ACCB
Data 1200
Data 2024
Data 2300
SR
After
Instruction
BB00
52CE
11FE
2000
0024
2302
00 9834 4500
BB00
52CE
9834
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MPY
Syntax:
Multiply Wm by Wn to Accumulator
{label:} MPY
Wm * Wn, Acc {,[Wx], Wxd}
{,[Wy], Wyd}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wn ∈ [W4 * W5, W4 * W6, W4 * W7, W5 * W6, W5 * W7, W6 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
AWB ∈ [W13], [W13] + = 2
Operation:
(Wm) * (Wn) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1100
0mmm
A0xx
yyii
iijj
jj11
Multiply the contents of two working registers, optionally prefetch
operands in preparation for another MAC type instruction and optionally
store the unspecified accumulator results. The 32-bit result of the signed
multiply is sign-extended to 40 bits and stored to the specified
accumulator.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”.
The ‘m’ bits select the operand registers Wm and Wn for the multiply:
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Note:
Words:
1
Cycles:
1
The IF bit, CORCON<0>, determines if the multiply is
fractional or an integer.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-161
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
MPY W4*W5, A, [W8]+=2, W6, [W10]-=2, W7
; Multiply W4*W5 and store to ACCA
; Fetch [W8] to W6, Post-increment W8 by 2
; Fetch [W10] to W7, Post-decrement W10 by 2
; CORCON = 0x0000 (fractional multiply, no saturation)
W4
W5
W6
W7
W8
W10
ACCA
Data 1780
Data 2400
CORCON
SR
Example 2:
W4
W5
W6
W7
W8
W10
ACCA
Data 1780
Data 2400
CORCON
SR
After
Instruction
C000
9000
671F
E3DC
1782
23FE
00 3800 0000
671F
E3DC
0000
0000
MPY W6*W7, B, [W8]+=2, W4, [W10]-=2, W5
; Multiply W6*W7 and store to ACCB
; Fetch [W8] to W4, Post-increment W8 by 2
; Fetch [W10] to W5, Post-decrement W10 by 2
; CORCON = 0x0000 (fractional multiply, no saturation)
W4
W5
W6
W7
W8
W10
ACCB
Data 1782
Data 23FE
CORCON
SR
DS70157B-page 5-162
Before
Instruction
C000
9000
0800
B200
1780
2400
FF F780 2087
671F
E3DC
0000
0000
Before
Instruction
C000
9000
671F
E3DC
1782
23FE
00 9834 4500
8FDC
0078
0000
0000
Preliminary
W4
W5
W6
W7
W8
W10
ACCB
Data 1782
Data 23FE
CORCON
SR
After
Instruction
8FDC
0078
671F
E3DC
1784
23FC
FF E954 3748
8FDC
0078
0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MPY
Syntax:
Square to Accumulator
{label:} MPY
Wm * Wm, Acc {,[Wx], Wxd}
{,[Wy], Wyd}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wm ∈ [W4 * W4, W5 * W5, W6 * W6, W7 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
Operation:
(Wm) * (Wm) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
1111
Description:
00mm
A0xx
yyii
iijj
jj01
Square the contents of a working register, optionally prefetch operands in
preparation for another MAC type instruction and optionally store the
unspecified accumulator results. The 32-bit result of the signed multiply is
sign-extended to 40 bits and stored in the specified accumulator.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations
which support indirect and register offset addressing, as described in
Section 4.14.1 “MAC Prefetches”.
The ‘m’ bits select the operand register Wm for the square.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Note:
Words:
1
Cycles:
1
Example 1:
MPY W6*W6, A, [W9]+=2, W6
; Square W6 and store to ACCA
; Fetch [W9] to W6, Post-increment W9 by 2
; CORCON = 0x0000 (fractional multiply, no saturation)
Before
Instruction
6500
0900
00 7C80 0908
B865
0000
0000
Preliminary
W6
W9
ACCA
Data 0900
CORCON
SR
After
Instruction
B865
0902
00 4FB2 0000
B865
0000
0000
DS70157B-page 5-163
5
Instruction
Descriptions
W6
W9
ACCA
Data 0900
CORCON
SR
© 2005 Microchip Technology Inc.
The IF bit, CORCON<0>, determines if the multiply is
fractional or an integer.
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MPY W4*W4, B, [W9+W12], W4, [W10]+=2, W5
; Square W4 and store to ACCB
; Fetch [W9+W12] to W4
; Fetch [W10] to W5, Post-increment W10 by 2
; CORCON = 0x0000 (fractional multiply, no saturation)
W4
W5
W9
W10
W12
ACCB
Data 1600
Data 1B00
CORCON
SR
DS70157B-page 5-164
Before
Instruction
E228
9000
1700
1B00
FF00
00 9834 4500
8911
F678
0000
0000
Preliminary
W4
W5
W9
W10
W12
ACCB
Data 1600
Data 1B00
CORCON
SR
After
Instruction
8911
F678
1700
1B02
FF00
00 06F5 4C80
8911
F678
0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MPY.N
Multiply -Wm by Wn to Accumulator
Syntax:
Wm * Wn, Acc {,[Wx], Wxd}
{label:} MPY.N
{,[Wy], Wyd}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wn ∈ [W4 * W5; W4 * W6; W4 * W7; W5 * W6; W5 * W7; W6 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
Operation:
-(Wm) * (Wn) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
Status Affected:
OA, OB, OAB
Encoding:
1100
Description:
0mmm
A1xx
yyii
iijj
jj11
Multiply the contents of a working register by the negative of the contents
of another working register, optionally prefetch operands in preparation for
another MAC type instruction and optionally store the unspecified
accumulator results. The 32-bit result of the signed multiply is
sign-extended to 40 bits and stored to the specified accumulator.
The ‘m’ bits select the operand registers Wm and Wn for the multiply.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
Note:
Words:
1
Cycles:
1
Example 1:
MPY.N W4*W5, A, [W8]+=2, W4, [W10]+=2, W5
; Multiply W4*W5, negate the result and store to ACCA
; Fetch [W8] to W4, Post-increment W8 by 2
; Fetch [W10] to W5, Post-increment W10 by 2
; CORCON = 0x0001 (integer multiply, no saturation)
Before
Instruction
3023
1290
0B00
2000
00 0000 2387
0054
660A
0001
0000
Preliminary
W4
W5
W8
W10
ACCA
Data 0B00
Data 2000
CORCON
SR
After
Instruction
0054
660A
0B02
2002
FF FC82 7650
0054
660A
0001
0000
DS70157B-page 5-165
5
Instruction
Descriptions
W4
W5
W8
W10
ACCA
Data 0B00
Data 2000
CORCON
SR
© 2005 Microchip Technology Inc.
The IF bit, CORCON<0>, determines if the multiply is fractional
or an integer.
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MPY.N W4*W5, A, [W8]+=2, W4, [W10]+=2, W5
; Multiply W4*W5, negate the result and store to ACCA
; Fetch [W8] to W4, Post-increment W8 by 2
; Fetch [W10] to W5, Post-increment W10 by 2
; CORCON = 0x0000 (fractional multiply, no saturation)
W4
W5
W8
W10
ACCA
Data 0B00
Data 2000
CORCON
SR
DS70157B-page 5-166
Before
Instruction
3023
1290
0B00
2000
00 0000 2387
0054
660A
0000
0000
Preliminary
W4
W5
W8
W10
ACCA
Data 0B00
Data 2000
CORCON
SR
After
Instruction
0054
660A
0B02
2002
FF F904 ECA0
0054
660A
0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MSC
Syntax:
Multiply and Subtract from Accumulator
{label:} MSC
Wm * Wn, Acc {,[Wx], Wxd}
{,[Wy], Wyd}
{,AWB}
{,[Wx] + = kx, Wxd} {,[Wy] + = ky, Wyd}
{,[Wx] – = kx, Wxd} {,[Wy] – = ky, Wyd}
{,[W9 + W12], Wxd} {,[W11 + W12], Wyd}
Operands:
Wm * Wn ∈ [W4 * W5, W4 * W6, W4 * W7, W5 * W6, W5 * W7, W6 * W7]
Acc ∈ [A,B]
Wx ∈ [W8, W9]; kx ∈ [-6, -4, -2, 2, 4, 6]; Wxd ∈ [W4 ... W7]
Wy ∈ [W10, W11]; ky ∈ [-6, -4, -2, 2, 4, 6]; Wyd ∈ [W4 ... W7]
AWB ∈ [W13, [W13] + = 2]
Operation:
(Acc(A or B)) − (Wm) * (Wn) → Acc(A or B)
([Wx]) → Wxd; (Wx) + kx → Wx
([Wy]) → Wyd; (Wy) + ky → Wy
(Acc(B or A)) rounded → AWB
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
Description:
1100
0mmm
A1xx
yyii
iijj
jjaa
Multiply the contents of two working registers, optionally prefetch
operands in preparation for another MAC type instruction and optionally
store the unspecified accumulator results. The 32-bit result of the signed
multiply is sign-extended to 40 bits and subtracted from the specified
accumulator.
Operands Wx, Wxd, Wy and Wyd specify optional prefetch operations
which support indirect and register offset addressing as described in
Section 4.14.1 “MAC Prefetches”. Operand AWB specifies the optional
store of the “other” accumulator as described in
Section 4.14.4 “MAC Write Back”.
The ‘m’ bits select the operand registers Wm and Wn for the multiply.
The ‘A’ bit selects the accumulator for the result.
The ‘x’ bits select the prefetch Wxd destination.
The ‘y’ bits select the prefetch Wyd destination.
The ‘i’ bits select the Wx prefetch operation.
The ‘j’ bits select the Wy prefetch operation.
The ‘a’ bits select the accumulator Write Back destination.
Note:
Words:
1
Cycles:
1
The IF bit, CORCON<0>, determines if the multiply is
fractional or an integer.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-167
dsPIC30F/33F Programmer’s Reference Manual
Example 1:
MSC W6*W7, A, [W8]-=4, W6, [W10]-=4, W7
; Multiply W6*W7 and subtract the result from ACCA
; Fetch [W8] to W6, Post-decrement W8 by 4
; Fetch [W10] to W7, Post-decrement W10 by 4
; CORCON = 0x0001 (integer multiply, no saturation)
W6
W7
W8
W10
ACCA
Data 0C00
Data 1C00
CORCON
SR
Example 2:
W6
W7
W8
W10
ACCA
Data 0C00
Data 1C00
CORCON
SR
After
Instruction
D309
100B
0BFC
1BFC
00 3738 5ED0
D309
100B
0001
0000
MSC W4*W5, B, [W11+W12], W5, W13
; Multiply W4*W5 and subtract the result from ACCB
; Fetch [W11+W12] to W5
; Write Back ACCA to W13
; CORCON = 0x0000 (fractional multiply, no saturation)
W4
W5
W11
W12
W13
ACCA
ACCB
Data 2000
CORCON
SR
DS70157B-page 5-168
Before
Instruction
9051
7230
0C00
1C00
00 0567 8000
D309
100B
0001
0000
Before
Instruction
0500
2000
1800
0800
6233
00 3738 5ED0
00 1000 0000
3579
0000
0000
Preliminary
W4
W5
W11
W12
W13
ACCA
ACCB
Data 2000
CORCON
SR
After
Instruction
0500
3579
1800
0800
3738
00 3738 5ED0
00 0EC0 0000
3579
0000
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MUL
Integer Unsigned Multiply f and WREG
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(WREG)<7:0> * (f)<7:0> → W2
For word operation:
(WREG) * (f) → W2:W3
Status Affected:
None
Encoding:
1011
Description:
MUL{.B}
1100
f
0B0f
ffff
ffff
ffff
Multiply the default working register WREG with the specified file
register and place the result in the W2:W3 register pair. Both operands
and the result are interpreted as unsigned integers. If this instruction is
executed in Byte mode, the 16-bit result is stored in W2. In Word mode,
the most significant word of the 32-bit result is stored in W3, and the
least significant word of the 32-bit result is stored in W2.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: The IF bit, CORCON<0>, has no effect on this operation.
4: This is the only instruction which provides for an 8-bit
multiply.
Words:
1
Cycles:
1
Example 1:
MUL.B
0x800
Before
Instruction
WREG (W0)
9823
W2
FFFF
W3
FFFF
Data 0800
2690
SR
0000
Example 2:
MUL
TMR1
© 2005 Microchip Technology Inc.
After
Instruction
WREG (W0)
9823
W2
13B0
W3
FFFF
Data 0800
2690
SR
0000
; Multiply (TMR1)*WREG (Word mode)
After
Instruction
WREG (W0)
F001
W2
C287
W3
2F5E
TMR1
3287
SR
0000
Preliminary
5
Instruction
Descriptions
Before
Instruction
WREG (W0)
F001
W2
0000
W3
0000
TMR1
3287
SR
0000
; Multiply (0x800)*WREG (Byte mode)
DS70157B-page 5-169
dsPIC30F/33F Programmer’s Reference Manual
MUL.SS
Syntax:
Integer 16x16-bit Signed Multiply
{label:}
MUL.SS
Wb,
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wnd ∈ [W0, W2, W4 ... W12]
Operation:
signed (Wb) * signed (Ws) → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
1001
1www
wddd
dppp
ssss
Multiply the contents of Wb with the contents of Ws, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in
Wnd + 1. Both source operands and the result Wnd are interpreted as
two’s complement signed integers. Register direct addressing must be
used for Wb and Wnd. Register direct or register indirect addressing
may be used for Ws.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.SS
W0, W1, W12
Before
Instruction
W0
9823
W1
67DC
W12
FFFF
W13
FFFF
SR
0000
DS70157B-page 5-170
; Multiply W0*W1
; Store the result to W12:W13
After
Instruction
W0
9823
W1
67DC
W12
D314
W13 D5DC
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
MUL.SS
W2, [--W4], W0
Before
Instruction
W0
FFFF
W1
FFFF
W2
0045
W4
27FE
Data 27FC
0098
SR
0000
; Pre-decrement W4
; Multiply W2*[W4]
; Store the result to W0:W1
After
Instruction
W0
28F8
W1
0000
W2
0045
W4
27FC
Data 27FC
0098
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-171
dsPIC30F/33F Programmer’s Reference Manual
MUL.SU
Integer 16x16-bit Signed-Unsigned Short Literal Multiply
Syntax:
{label:}
MUL.SU
Wb,
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wnd ∈ [W0, W2, W4 ... W12]
#lit5,
Wnd
Operation:
signed (Wb) * unsigned lit5 → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
1001
0www
wddd
d11k
kkkk
Multiply the contents of Wb with the 5-bit literal, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in Wnd + 1.
The Wb operand and the result Wnd are interpreted as a two’s
complement signed integer. The literal is interpreted as an unsigned
integer. Register direct addressing must be used for Wb and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘k’ bits define a 5-bit unsigned integer literal.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.SU
W0, #0x1F, W2
Before
Instruction
W0
C000
W2
1234
W3
C9BA
SR
0000
DS70157B-page 5-172
Preliminary
; Multiply W0 by literal 0x1F
; Store the result to W2:W3
After
Instruction
W0
C000
W2
4000
W3
FFF8
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
MUL.SU
W2, #0x10, W0
Before
Instruction
W0 ABCD
W1
89B3
W2
F240
SR
0000
; Multiply W2 by literal 0x10
; Store the result to W0:W1
After
Instruction
W0
2400
W1
000F
W2
F240
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-173
dsPIC30F/33F Programmer’s Reference Manual
MUL.SU
Syntax:
Integer 16x16-bit Signed-Unsigned Multiply
{label:}
MUL.SU
Wb,
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wnd ∈ [W0, W2, W4 ... W12]
Operation:
signed (Wb) * unsigned (Ws) → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
1001
0www
wddd
dppp
ssss
Multiply the contents of Wb with the contents of Ws, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in Wnd + 1.
The Wb operand and the result Wnd are interpreted as a two’s
complement signed integer. The Ws operand is interpreted as an
unsigned integer. Register direct addressing must be used for Wb and
Wnd. Register direct or register indirect addressing may be used for Ws.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.SU
W8, [W9], W0
Before
Instruction
W0
68DC
W1
AA40
W8
F000
W9
178C
Data 178C
F000
SR
0000
DS70157B-page 5-174
; Multiply W8*[W9]
; Store the result to W0:W1
After
Instruction
W0
0000
W1
F100
W8
F000
W9
178C
Data 178C
F000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
MUL.SU
W2, [++W3], W4
Before
Instruction
W2
0040
W3
0280
W4
1819
W5
2021
Data 0282
0068
SR
0000
; Pre-Increment W3
; Multiply W2*[W3]
; Store the result to W4:W5
After
Instruction
W2
0040
W3
0282
W4
1A00
W5
0000
Data 0282
0068
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-175
dsPIC30F/33F Programmer’s Reference Manual
MUL.US
Syntax:
Integer 16x16-bit Unsigned-Signed Multiply
{label:}
MUL.US
Wb,
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wnd ∈ [W0, W2, W4 ... W12]
Operation:
unsigned (Wb) * signed (Ws) → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
1000
1www
wddd
dppp
ssss
Multiply the contents of Wb with the contents of Ws, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in Wnd + 1.
The Wb operand is interpreted as an unsigned integer. The Ws operand
and the result Wnd are interpreted as a two’s complement signed
integer. Register direct addressing must be used for Wb and Wnd.
Register direct or register indirect addressing may be used for Ws.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.US
W0, [W1], W2
Before
Instruction
W0
C000
W1
2300
W2
00DA
W3
CC25
Data 2300
F000
SR
0000
DS70157B-page 5-176
; Multiply W0*[W1] (unsigned-signed)
; Store the result to W2:W3
After
Instruction
W0
C000
W1
2300
W2
0000
W3
F400
Data 2300
F000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
MUL.US
W6, [W5++], W10 ; Mult. W6*[W5] (unsigned-signed)
; Store the result to W10:W11
; Post-Increment W5
Before
Instruction
W5
0C00
W6
FFFF
W10
0908
W11
6EEB
Data 0C00
7FFF
SR
0000
After
Instruction
W5
0C02
W6
FFFF
W10
8001
W11
7FFE
Data 0C00
7FFF
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-177
dsPIC30F/33F Programmer’s Reference Manual
MUL.UU
Integer 16x16-bit Unsigned Short Literal Multiply
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wnd ∈ [W0, W2, W4 ... W12]
Operation:
unsigned (Wb) * unsigned lit5 → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
MUL.UU
Wb,
1000
0www
#lit5,
Wnd
wddd
d11k
kkkk
Multiply the contents of Wb with the 5-bit literal, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in Wnd + 1.
Both operands and the result are interpreted as unsigned integers.
Register direct addressing must be used for Wb and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘k’ bits define a 5-bit unsigned integer literal.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.UU
W0, #0xF, W12
Before
Instruction
W0
2323
W12
4512
W13
7821
SR
0000
Example 2:
MUL.UU
After
Instruction
W0
2323
W12
0F0D
W13
0002
SR
0000
W7, #0x1F, W0
Before
Instruction
W0
780B
W1
3805
W7
F240
SR
0000
DS70157B-page 5-178
; Multiply W0 by literal 0xF
; Store the result to W12:W13
Preliminary
; Multiply W7 by literal 0x1F
; Store the result to W0:W1
After
Instruction
W0
55C0
W1
001D
W7
F240
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
MUL.UU
Syntax:
Integer 16x16-bit Unsigned Multiply
{label:}
MUL.UU
Wb,
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wnd ∈ [W0, W2, W4 ... W12]
Operation:
unsigned (Wb) * unsigned (Ws) → Wnd:Wnd + 1
Status Affected:
None
Encoding:
Description:
1011
1000
0www
wddd
dppp
ssss
Multiply the contents of Wb with the contents of Ws, and store the 32-bit
result in two successive working registers. The least significant word of
the result is stored in Wnd (which must be an even numbered working
register), and the most significant word of the result is stored in
Wnd + 1. Both source operands and the result are interpreted as
unsigned integers. Register direct addressing must be used for Wb and
Wnd. Register direct or indirect addressing may be used for Ws.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the address of the lower destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: Since the product of the multiplication is 32 bits, Wnd must be
an even working register. See Figure 4-2 for information on
how double words are aligned in memory.
3: Wnd may not be W14, since W15<0> is fixed to zero.
4: The IF bit, CORCON<0>, has no effect on this operation.
Words:
1
Cycles:
1
Example 1:
MUL.UU
W4, W0, W2
; Multiply W4*W0 (unsigned-unsigned)
; Store the result to W2:W3
Before
Instruction
W0
FFFF
W2
2300
W3
00DA
W4
FFFF
SR
0000
After
Instruction
W0
FFFF
W2
0001
W3
FFFE
W4
FFFF
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-179
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
MUL.UU W0, [W1++], W4
Before
Instruction
W0
1024
W1
2300
W4
9654
W5 BDBC
Data 2300
D625
SR
0000
DS70157B-page 5-180
; Mult. W0*[W1] (unsigned-unsigned)
; Store the result to W4:W5
; Post-Increment W1
After
Instruction
W0
1024
W1
2302
W4
6D34
W5
0D80
Data 2300
D625
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
NEG
Negate f
Syntax:
{label:}
NEG{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) + 1 → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
1110
0BDf
ffff
ffff
ffff
Compute the two’s complement of the contents of the file register and
place the result in the destination register. The optional WREG operand
determines the destination register. If WREG is specified, the result is
stored in WREG. If WREG is not specified, the result is stored in the file
register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
NEG.B
0x880, WREG
Before
Instruction
WREG (W0)
9080
Data 0880
2355
SR
0000
Example 2:
NEG
0x1200
Before
Instruction
Data 1200
8923
SR
0000
; Negate (0x880) (Byte mode)
; Store result to WREG
After
Instruction
WREG (W0) 90AB
Data 0880
2355
SR
0008 (N = 1)
; Negate (0x1200) (Word mode)
After
Instruction
Data 1200 76DD
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-181
dsPIC30F/33F Programmer’s Reference Manual
NEG
Negate Ws
Syntax:
{label:}
NEG{.B}
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) + 1 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
1110
Description:
1010
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
0Bqq
qddd
dppp
ssss
Compute the two’s complement of the contents of the source register
Ws and place the result in the destination register Wd. Either register
direct or indirect addressing may be used for both Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
NEG.B
W3, [W4++]
Before
Instruction
W3
7839
W4
1005
Data 1004
2355
SR
0000
Example 2:
NEG
; Negate W3 and store to [W4] (Byte mode)
; Post-increment W4
After
Instruction
W3
7839
W4
1006
Data 1004 C755
SR
0008 (N = 1)
[W2++], [--W4]
Before
Instruction
W2
0900
W4
1002
Data 0900
870F
Data 1000
5105
SR
0000
DS70157B-page 5-182
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Pre-decrement W4 (Word mode)
; Negate [W2] and store to [W4]
; Post-increment W2
After
Instruction
W2
0902
W4
1000
Data 0900
870F
Data 1000
78F1
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
NEG
Negate Accumulator
Syntax:
{label:}
Operands:
Acc ∈ [A,B]
Operation:
If (Acc = A):
-ACCA → ACCA
Else:
-ACCB → ACCB
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
NEG
1100
Description:
1011
Acc
A001
0000
0000
0000
Compute the two’s complement of the contents of the specified
accumulator. Regardless of the Saturation mode, this instruction
operates on all 40 bits of the accumulator.
The ‘A’ bit specifies the selected accumulator.
Words:
1
Cycles:
1
Example 1:
NEG
ACCA
CORCON
SR
Example 2:
NEG
ACCB
CORCON
SR
A
; Negate ACCA
; Store result to ACCA
; CORCON = 0x0000 (no saturation)
Before
Instruction
00 3290 59C8
0000
0000
B
ACCA
CORCON
SR
After
Instruction
FF CD6F A638
0000
0000
; Negate ACCB
; Store result to ACCB
; CORCON = 0x00C0 (normal saturation)
Before
Instruction
FF F230 10DC
00C0
0000
ACCB
CORCON
SR
After
Instruction
00 0DCF EF24
00C0
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-183
dsPIC30F/33F Programmer’s Reference Manual
NOP
No Operation
Syntax:
{label:}
Operands:
None
Operation:
No Operation
Status Affected:
None
Encoding:
0000
Description:
NOP
0000
xxxx
xxxx
xxxx
xxxx
No Operation is performed.
The ‘x’ bits can take any value.
Words:
1
Cycles:
1
Example 1:
NOP
PC
SR
Example 2:
DS70157B-page 5-184
Before
Instruction
00 1092
0000
NOP
PC
SR
; execute no operation
After
Instruction
PC
00 1094
SR
0000
; execute no operation
Before
Instruction
00 08AE
0000
Preliminary
After
Instruction
PC
00 08B0
SR
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
NOPR
No Operation
Syntax:
{label:}
Operands:
None
Operation:
No Operation
Status Affected:
None
Encoding:
1111
Description:
NOPR
1111
xxxx
xxxx
xxxx
xxxx
No Operation is performed.
The ‘x’ bits can take any value.
Words:
1
Cycles:
1
Example 1:
NOPR
PC
SR
Example 2:
Before
Instruction
00 2430
0000
NOPR
PC
SR
; execute no operation
After
Instruction
PC
00 2432
SR
0000
; execute no operation
Before
Instruction
00 1466
0000
After
Instruction
PC
00 1468
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-185
dsPIC30F/33F Programmer’s Reference Manual
POP
Pop TOS to f
Syntax:
{label:}
Operands:
f ∈ [0 ... 65534]
Operation:
(W15) – 2 → W15
(TOS) → f
Status Affected:
None
Encoding:
1111
Description:
POP
1001
f
ffff
ffff
ffff
fff0
The Stack Pointer (W15) is pre-decremented by 2 and the Top-of-Stack
(TOS) word is written to the specified file register, which may reside
anywhere in the lower 32K words of data memory.
The ‘f’ bits select the address of the file register.
Note 1: This instruction operates in Word mode only.
2: The file register address must be word-aligned.
Words:
1
Cycles:
1
Example 1:
POP
0x1230
Before
Instruction
W15
1006
Data 1004 A401
Data 1230
2355
SR
0000
Example 2:
POP
0x880
Before
Instruction
W15
2000
Data 0880 E3E1
Data 1FFE A090
SR
0000
DS70157B-page 5-186
; Pop TOS to 0x1230
After
Instruction
W15
1004
Data 1004 A401
Data 1230 A401
SR
0000
; Pop TOS to 0x880
After
Instruction
W15 1FFE
Data 0880 A090
Data 1FFE A090
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
POP
Pop TOS to Wd
Syntax:
{label:}
POP
Wd
[Wd]
[Wd++]
[Wd--]
[--Wd]
[++Wd]
[Wd+Wb]
Operands:
Wd ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Operation:
(W15) – 2 → W15
(TOS) → Wd
Status Affected:
None
Encoding:
0111
Description:
1www
w0hh
hddd
d100
1111
The Stack Pointer (W15) is pre-decremented by 2 and the Top-of-Stack
(TOS) word is written to Wd. Either register direct or indirect addressing
may be used for Wd.
The ‘w’ bits define the offset register Wb.
The ‘h’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
Note 1: This instruction operates in Word mode only.
2: This instruction is a specific version of the “MOV Ws, Wd”
instruction (MOV [--W15], Wd). It reverse assembles as
MOV.
Words:
1
Cycles:
1
Example 1:
POP
W4
; Pop TOS to W4
Before
Instruction
W4 EDA8
W15
1008
Data 1006 C45A
SR
0000
Example 2:
POP
[++W10]
© 2005 Microchip Technology Inc.
; Pre-increment W10
; Pop TOS to [W10]
After
Instruction
W10 0E04
W15
1764
Data 0E04 C7B5
Data 1764 C7B5
SR
0000
Preliminary
5
Instruction
Descriptions
Before
Instruction
W10 0E02
W15
1766
Data 0E04 E3E1
Data 1764 C7B5
SR
0000
After
Instruction
W4 C45A
W15
1006
Data 1006 C45A
SR
0000
DS70157B-page 5-187
dsPIC30F/33F Programmer’s Reference Manual
POP.D
Double Pop TOS to Wnd:Wnd+1
Syntax:
{label:}
Operands:
Wnd ∈ [W0, W2, W4, ... W14]
Operation:
(W15) – 2 → W15
(TOS) → Wnd + 1
(W15) – 2 → W15
(TOS) → Wnd
Status Affected:
None
Encoding:
Description:
1011
POP.D
1110
Wnd
0000
0ddd
0100
1111
A double word is POPped from the Top-of-Stack (TOS) and stored to
Wnd:Wnd + 1. The most significant word is stored to Wnd + 1, and the
least significant word is stored to Wnd. Since a double word is POPped,
the Stack Pointer (W15) gets decremented by 4.
The ‘d’ bits select the address of the destination register pair.
Note 1: This instruction operates on double words. See Figure 4-2 for
information on how double words are aligned in memory.
2: Wnd must be an even working register.
3: This instruction is a specific version of the “MOV.D Ws, Wnd”
instruction (MOV.D [--W15], Wnd). It reverse assembles as
MOV.D.
Words:
1
Cycles:
2
Example 1:
POP.D
W6
Before
Instruction
W6 07BB
W7 89AE
W15
0850
Data 084C
3210
Data 084E
7654
SR
0000
Example 2:
POP.D
W0
Before
Instruction
W0 673E
W1 DD23
W15 0BBC
Data 0BB8 791C
Data 0BBA D400
SR
0000
DS70157B-page 5-188
; Double pop TOS to W6
After
Instruction
W6
3210
W7
7654
W15 084C
Data 084C
3210
Data 084E
7654
SR
0000
; Double pop TOS to W0
After
Instruction
W0 791C
W1 D400
W15 0BB8
Data 0BB8 791C
Data 0BBA D400
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
POP.S
Pop Shadow Registers
Syntax:
{label:}
Operands:
None
Operation:
POP shadow registers
Status Affected:
DC, N, OV, Z, C
Encoding:
1111
Description:
POP.S
1110
1000
0000
0000
0000
The values in the shadow registers are copied into their respective
primary registers. The following registers are affected: W0-W3, and the
C, Z, OV, N and DC STATUS register flags.
Note 1: The shadow registers are not directly accessible. They may
only be accessed with PUSH.S and POP.S.
2: The shadow registers are only one-level deep.
Words:
1
Cycles:
1
Example 1:
POP.S
; Pop the shadow registers
; (See PUSH.S Example 1 for contents of shadows)
Before
Instruction
W0 07BB
W1 03FD
W2
9610
W3
7249
SR 00E0 (IPL = 7)
Note:
After
Instruction
W0
0000
W1
1000
W2
2000
W3
3000
SR 00E1 (IPL = 7, C = 1)
After instruction execution, contents of shadow registers are NOT modified.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-189
dsPIC30F/33F Programmer’s Reference Manual
PUSH
Push f to TOS
Syntax:
{label:}
Operands:
f ∈ [0 ... 65534]
Operation:
(f) → (TOS)
(W15) + 2 → W15
Status Affected:
None
Encoding:
1111
Description:
PUSH
f
1000
ffff
ffff
ffff
fff0
The contents of the specified file register are written to the Top-of-Stack
(TOS) location and then the Stack Pointer (W15) is incremented by 2.
The file register may reside anywhere in the lower 32K words of data
memory.
The ‘f’ bits select the address of the file register.
Note 1: This instruction operates in Word mode only.
2: The file register address must be word-aligned.
Words:
1
Cycles:
1
Example 1:
PUSH
0x2004
Before
Instruction
W15 0B00
Data 0B00 791C
Data 2004 D400
SR
0000
Example 2:
PUSH
0xC0E
Before
Instruction
W15
0920
Data 0920
0000
Data 0C0E 67AA
SR
0000
DS70157B-page 5-190
; Push (0x2004) to TOS
After
Instruction
W15 0B02
Data 0B00 D400
Data 2004 D400
SR
0000
; Push (0xC0E) to TOS
After
Instruction
W15
0922
Data 0920 67AA
Data 2004 67AA
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
PUSH
Push Ws to TOS
Syntax:
{label:}
PUSH
Ws
[Ws]
[Ws++]
[Ws--]
[--Ws]
[++Ws]
[Ws+Wb]
Operands:
Ws ∈ [W0 ... W15]
Wb ∈ [W0 ... W15]
Operation:
(Ws) → (TOS)
(W15) + 2 → W15
Status Affected:
None
Encoding:
0111
Description:
1www
w001
1111
1ggg
ssss
The contents of Ws are written to the Top-of-Stack (TOS) location and
then the Stack Pointer (W15) is incremented by 2.
The ‘w’ bits define the offset register Wb.
The ‘g’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: This instruction is a specific version of the “MOV Ws, Wd”
instruction (MOV Ws, [W15++]). It reverse assembles as
MOV.
Words:
1
Cycles:
1
Example 1:
PUSH
W2
; Push W2 to TOS
Before
Instruction
W2
6889
W15
1566
Data 1566
0000
SR
0000
Example 2:
PUSH
[W5+W10]
© 2005 Microchip Technology Inc.
; Push [W5+W10] to TOS
After
Instruction
W5
1200
W10
0044
W15
0808
Data 0806 B20A
Data 1244 B20A
SR
0000
Preliminary
5
Instruction
Descriptions
Before
Instruction
W5
1200
W10
0044
W15
0806
Data 0806
216F
Data 1244 B20A
SR
0000
After
Instruction
W2
6889
W15
1568
Data 1566
6889
SR
0000
DS70157B-page 5-191
dsPIC30F/33F Programmer’s Reference Manual
PUSH.D
Syntax:
Double Push Wns:Wns+1 to TOS
{label:}
PUSH.D
Wns
Operands:
Wns ∈ [W0, W2, W4 ... W14]
Operation:
(Wns) → (TOS)
(W15) + 2 → W15
(Wns + 1) → (TOS)
(W15) + 2 → W15
Status Affected:
None
Encoding:
Description:
1011
1110
1001
1111
1000
sss0
A double word (Wns:Wns + 1) is PUSHed to the Top-of-Stack (TOS).
The least significant word (Wns) is PUSHed to the TOS first, and the
most significant word (Wns + 1) is PUSHed to the TOS last. Since a
double word is PUSHed, the Stack Pointer (W15) gets incremented by
4.
The ‘s’ bits select the address of the source register pair.
Note 1: This instruction operates on double words. See Figure 4-2 for
information on how double words are aligned in memory.
2: Wns must be an even working register.
3: This instruction is a specific version of the “MOV.D Wns, Wd”
instruction (MOV.D Wns, [W15++]). It reverse assembles
as MOV.D.
Words:
1
Cycles:
2
Example 1:
PUSH.D
W6
Before
Instruction
W6 C451
W7
3380
W15
1240
Data 1240 B004
Data 1242
0891
SR
0000
Example 2:
PUSH.D
W10
Before
Instruction
W10 80D3
W11
4550
W15 0C08
Data 0C08 79B5
Data 0C0A 008E
SR
0000
DS70157B-page 5-192
; Push W6:W7 to TOS
After
Instruction
W6 C451
W7
3380
W15
1244
Data 1240 C451
Data 1242
3380
SR
0000
; Push W10:W11 to TOS
After
Instruction
W10 80D3
W11
4550
W15 0C0C
Data 0C08 80D3
Data 0C0A
4550
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
PUSH.S
Push Shadow Registers
Syntax:
{label:}
Operands:
None
Operation:
PUSH shadow registers
Status Affected:
None
Encoding:
PUSH.S
1111
Description:
1110
1010
0000
0000
0000
The contents of the primary registers are copied into their respective
shadow registers. The following registers are shadowed: W0-W3, and
the C, Z, OV, N and DC STATUS register flags.
Note 1: The shadow registers are not directly accessible. They may
only be accessed with PUSH.S and POP.S.
2: The shadow registers are only one-level deep.
Words:
1
Cycles:
1
Example 1:
PUSH.S
; Push primary registers into shadow registers
Before
Instruction
W0
0000
W1
1000
W2
2000
W3
3000
SR
0001 (C = 1)
Note:
After
Instruction
W0
0000
W1
1000
W2
2000
W3
3000
SR
0001 (C = 1)
After an instruction execution, contents of the shadow registers are updated.
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-193
dsPIC30F/33F Programmer’s Reference Manual
PWRSAV
Enter Power Saving Mode
Syntax:
{label:}
Operands:
lit1 ∈ [0,1]
Operation:
0 → WDT count register
0 → WDT prescaler A count
0 → WDT prescaler B count
0 → WDTO (RCON<4>)
0 → SLEEP (RCON<3>)
0 → IDLE (RCON<2>)
If (lit1 = 0):
Enter Sleep mode
Else:
Enter Idle mode
Status Affected:
None
Encoding:
Description:
1111
PWRSAV
1110
#lit1
0100
0000
0000
000k
Place the processor into the specified Power Saving mode. If lit1 = ‘0’,
Sleep mode is entered. In Sleep mode, the clock to the CPU and peripherals are shutdown. If an on-chip oscillator is being used, it is also shutdown. If lit1 = ‘1’, Idle mode is entered. In Idle mode, the clock to the
CPU shuts down, but the clock source remains active and the
peripherals continue to operate.
This instruction resets the Watchdog Timer Count register and the
Prescaler Count registers. In addition, the WDTO, Sleep and Idle flags
of the Reset System and Control (RCON) register are reset.
Note 1: The processor will exit from Idle or Sleep through an interrupt,
processor Reset or Watchdog Time-out. See the dsPIC30F
Data Sheet for details.
2: If awakened from Idle mode, Idle (RCON<2>) is set to ‘1’ and
the clock source is applied to the CPU.
3: If awakened from Sleep mode, Sleep (RCON<3>) is set to ‘1’
and the clock source is started.
4: If awakened from a Watchdog Time-out, WDTO (RCON<4>)
is set to ‘1’.
Words:
1
Cycles:
1
Example 1:
PWRSAV
#0
; Enter SLEEP mode
Before
Instruction
SR
0040 (IPL = 2)
Example 2:
PWRSAV
#1
; Enter IDLE mode
Before
Instruction
SR
0020 (IPL = 1)
DS70157B-page 5-194
After
Instruction
SR
0040 (IPL = 2)
After
Instruction
SR
0020 (IPL = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RCALL
Relative Call
Syntax:
{label:}
Operands:
Expr may be an absolute address, label or expression.
Expr is resolved by the linker to a Slit16, where Slit16 ∈ [-32768 ... 32767].
Operation:
(PC) + 2 → PC
(PC<15:0>) → (TOS)
(W15) + 2 → W15
(PC<22:16>) → (TOS)
(W15) + 2 → W15
(PC) + (2 * Slit16) → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
RCALL
0000
Description:
Expr
0111
nnnn
nnnn
nnnn
nnnn
Relative subroutine call with a range of 32K program words forward or back
from the current PC. Before the call is made, the return address (PC + 2) is
PUSHed onto the stack. After the return address is stacked, the
sign-extended 17-bit value (2 * Slit16) is added to the contents of the PC
and the result is stored in the PC.
The ‘n’ bits are a signed literal that specifies the size of the relative call (in
program words) from (PC + 2).
Note:
Words:
1
Cycles:
2
Example 1:
012004
012006
.
.
012458 _Task1:
01245A
PC
W15
Data 0810
Data 0812
SR
Example 2:
RCALL
ADD
...
...
SUB
...
Before
Instruction
01 2004
0810
FFFF
FFFF
0000
00620E
006210
.
.
007000 _Init:
007002
Before
Instruction
00 620E
0C50
FFFF
FFFF
0000
_Task1
W0, W1, W2
; Call _Task1
W0, W2, W3
; _Task1 subroutine
After
Instruction
PC
01 2458
W15
0814
Data 0810
2006
Data 0812
0001
SR
0000
RCALL
MOV
...
...
CLR
...
_Init
W0, [W4++]
; Call _Init
W2
; _Init subroutine
After
Instruction
PC
00 7000
W15
0C54
Data 0C50
6210
Data 0C52
0000
SR
0000
Preliminary
5
Instruction
Descriptions
PC
W15
Data 0C50
Data 0C52
SR
© 2005 Microchip Technology Inc.
When possible, this instruction should be used instead of CALL,
since it only consumes one word of program memory.
DS70157B-page 5-195
dsPIC30F/33F Programmer’s Reference Manual
RCALL
Computed Relative Call
Syntax:
{label:}
RCALL
Wn
Operands:
Wn ∈ [W0 ... W15]
Operation:
(PC) + 2 → PC
(PC<15:0>) → (TOS)
(W15) + 2 → W15
(PC<22:16>) → (TOS)
(W15) + 2 → W15
(PC) + (2 * (Wn)) → PC
NOP → Instruction Register
Status Affected:
None
Encoding:
0000
Description:
0001
0010
0000
0000
ssss
Computed, relative subroutine call specified by the working register Wn.
The range of the call is 32K program words forward or back from the current
PC. Before the call is made, the return address (PC + 2) is PUSHed onto
the stack. After the return address is stacked, the sign-extended 17-bit
value (2 * (Wn)) is added to the contents of the PC and the result is stored in
the PC. Register direct addressing must be used for Wn.
The ‘s’ bits select the source register.
Words:
1
Cycles:
2
Example 1:
00FF8C
00FF8E
.
.
010008
01000A
01000C
PC
W6
W15
Data 1004
Data 1006
SR
Example 2:
DS70157B-page 5-196
INC
...
...
...
W2, W3
; Destination of RCALL
RCALL
MOVE
W6
W4, [W10]
; RCALL with W6
Before
Instruction
01 000A
FFC0
1004
98FF
2310
0000
000302
000304
.
.
000450
000452
PC
W2
W15
Data 1004
Data 1006
SR
EX1:
EX2:
Before
Instruction
00 0302
00A6
1004
32BB
901A
0000
After
Instruction
PC
00 FF8C
W6
FFC0
W15
1008
Data 1004
000C
Data 1006
0001
SR
0000
RCALL
FF1L
...
...
CLR
...
W2
W0, W1
; RCALL with W2
W2
; Destination of RCALL
After
Instruction
PC
00 0450
W2
00A6
W15
1008
Data 1004
0304
Data 1006
0000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
REPEAT
Repeat Next Instruction ‘lit14+1’ Times
Syntax:
{label:}
Operands:
lit14 ∈ [0 ... 16383]
Operation:
(lit14) → RCOUNT
(PC) + 2 → PC
Enable Code Looping
Status Affected:
RA
Encoding:
REPEAT
0000
Description:
#lit14
1001
00kk
kkkk
kkkk
kkkk
Repeat the instruction immediately following the REPEAT instruction
(lit14 + 1) times. The repeated instruction (or target instruction) is held in
the instruction register for all iterations and is only fetched once.
When this instruction executes, the RCOUNT register is loaded with the
repeat count value specified in the instruction. RCOUNT is decremented
with each execution of the target instruction. When RCOUNT equals
zero, the target instruction is executed one more time, and then normal
instruction execution continues with the instruction following the target
instruction.
The ‘k’ bits are an unsigned literal that specifies the loop count.
Special Features, Restrictions:
1. When the repeat literal is ‘0’, REPEAT has the effect of a NOP and
the RA bit is not set.
2. The target REPEAT instruction can NOT be:
• an instruction that changes program flow
• a DO, DISI, LNK, MOV.D, PWRSAV, REPEAT or UNLK
instruction
• a 2-word instruction
Unexpected results may occur if these target instructions are used.
Note:
Words:
1
Cycles:
1
Example 1:
000452
000454
PC
RCOUNT
SR
Example 2:
REPEAT
CLR
; Execute ADD 10 times
; Vector update
After
Instruction
PC
00 0454
RCOUNT
0009
SR
0010 (RA = 1)
#0x3FF
[W6++]
Before
Instruction
00 089E
0000
0000
Preliminary
; Execute CLR 1024 times
; Clear the scratch space
After
Instruction
PC
00 08A0
RCOUNT
03FF
SR
0010 (RA = 1)
DS70157B-page 5-197
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
REPEAT #9
ADD
[W0++], W1, [W2++]
Before
Instruction
00 0452
0000
0000
00089E
0008A0
PC
RCOUNT
SR
The REPEAT and target instruction are interruptible.
dsPIC30F/33F Programmer’s Reference Manual
REPEAT
Syntax:
Repeat Next Instruction Wn+1 Times
{label:}
REPEAT
Wn
Operands:
Wn ∈ [W0 ... W15]
Operation:
(Wn<13:0>) → RCOUNT
(PC) + 2 → PC
Enable Code Looping
Status Affected:
RA
Encoding:
0000
Description:
1001
1000
0000
0000
ssss
Repeat the instruction immediately following the REPEAT instruction
(Wn<13:0>) times. The instruction to be repeated (or target instruction)
is held in the instruction register for all iterations and is only fetched
once.
When this instruction executes, the RCOUNT register is loaded with the
lower 14 bits of Wn. RCOUNT is decremented with each execution of
the target instruction. When RCOUNT equals zero, the target instruction
is executed one more time, and then normal instruction execution
continues with the instruction following the target instruction.
The ‘s’ bits specify the Wn register that contains the repeat count.
Special Features, Restrictions:
1. When (Wn) = 0, REPEAT has the effect of a NOP and the RA bit is
not set.
2. The target REPEAT instruction can NOT be:
• an instruction that changes program flow
• a DO, DISI, LNK, MOV.D, PWRSAV, REPEAT or ULNK
instruction
• a 2-word instruction
Unexpected results may occur if these target instructions are used.
Note:
Words:
1
Cycles:
1
Example 1:
000A26
000A28
PC
W4
RCOUNT
SR
DS70157B-page 5-198
REPEAT
COM
The REPEAT and target instruction are interruptible.
W4
[W0++], [W2++]
Before
Instruction
00 0A26
0023
0000
0000
Preliminary
; Execute COM (W4+1) times
; Vector complement
After
Instruction
PC
00 0A28
W4
0023
RCOUNT
0023
SR
0010 (RA = 1)
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
00089E
0008A0
PC
W10
RCOUNT
SR
REPEAT
TBLRDL
W10
; Execute TBLRD (W10+1) times
[W2++], [W3++] ; Decrement (0x840)
Before
Instruction
00 089E
00FF
0000
0000
After
Instruction
PC
00 08A0
W10
00FF
RCOUNT
00FF
SR
0010 (RA = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-199
dsPIC30F/33F Programmer’s Reference Manual
RESET
Reset
Syntax:
{label:}
Operands:
None
Operation:
Force all registers that are affected by a MCLR Reset to their Reset
condition.
1 → SWR (RCON<6>)
0 → PC
Status Affected:
OA, OB, OAB, SA, SB, SAB, DA, DC, IPL<2:0>, RA, N, OV, Z, C
Encoding:
1111
Description:
Words:
1
Cycles:
1
00202A
PC
W0
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
W13
W14
W15
SPLIM
TBLPAG
PSVPAG
CORCON
RCON
SR
DS70157B-page 5-200
1110
0000
0000
0000
0000
This instruction provides a way to execute a software Reset. All core
and peripheral registers will take their power-on value. The PC will be
set to ‘0’, the location of the RESET GOTO instruction. The SWR bit,
RCON<6>, will be set to ‘1’ to indicate that the RESET instruction was
executed.
Note:
Example 1:
RESET
RESET
Refer to the dsPIC30F Family Reference Manual (DS70046)
for the power-on value of all registers.
; Execute software RESET
Before
After
Instruction
Instruction
00 202A
PC
00 0000
8901
W0
0000
08BB
W1
0000
B87A
W2
0000
872F
W3
0000
C98A
W4
0000
AAD4
W5
0000
981E
W6
0000
1809
W7
0000
C341
W8
0000
90F4
W9
0000
F409
W10
0000
1700
W11
0000
1008
W12
0000
6556
W13
0000
231D
W14
0000
1704
W15
0800
1800
SPLIM
0000
007F
TBLPAG
0000
0001
PSVPAG
0000
00F0
CORCON
0020 (SATDW = 1)
0000
RCON
0040 (SWR = 1)
0021 (IPL, C = 1)
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RETFIE
Syntax:
Return from Interrupt
{label:}
RETFIE
Operands:
None
Operation:
(W15) - 2 → W15
(TOS<15:8>) → (SR<7:0>)
(TOS<7>) → (IPL3, CORCON<3>)
(TOS<6:0>) → (PC<22:16>)
(W15) - 2 → W15
(TOS<15:0>) → (PC<15:0>)
NOP → Instruction Register
Status Affected:
IPL<3:0>, RA, N, OV, Z, C
Encoding:
0000
Description:
0110
0100
0000
0000
0000
Return from Interrupt Service Routine. The stack is POPped, which
loads the low byte of the STATUS register, IPL<3> (CORCON<3>) and
the Most Significant Byte of the PC. The stack is POPped again, which
loads the lower 16 bits of the PC.
Note 1: Restoring IPL<3> and the low byte of the STATUS register
restores the Interrupt Priority Level to the level before the
execution was processed.
2: Before RETFIE is executed, the appropriate interrupt flag
must be cleared in software to avoid recursive interrupts.
Words:
1
Cycles:
3 (2 if exception pending)
Example 1:
000A26
PC
W15
Data 0830
Data 0832
CORCON
SR
Example 2:
RETFIE
Before
Instruction
00 8050
0926
7008
0300
0000
0000
; Return from ISR
After
Instruction
PC
01 0230
W15
0830
Data 0830
0230
Data 0832
8101
CORCON
0001
SR
0081 (IPL = 4, C = 1)
; Return from ISR
After
Instruction
PC
00 7008
W15
0922
Data 0922
7008
Data 0924
0300
CORCON
0000
SR
0003 (Z, C = 1)
Preliminary
DS70157B-page 5-201
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Before
Instruction
00 0A26
0834
0230
8101
0001
0000
008050
PC
W15
Data 0922
Data 0924
CORCON
SR
RETFIE
dsPIC30F/33F Programmer’s Reference Manual
RETLW
Return with Literal in Wn
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
(W15) – 2 → W15
(TOS) → (PC<22:16>)
(W15) – 2 → W15
(TOS) → (PC<15:0>)
lit10 → Wn
Status Affected:
None
Encoding:
0000
Description:
RETLW{.B} #lit10,
0101
0Bkk
Wn
kkkk
kkkk
dddd
Return from subroutine with the specified, unsigned 10-bit literal stored
in Wn. The software stack is POPped twice to restore the PC and the
signed literal is stored in Wn. Since two POPs are made, the Stack
Pointer (W15) is decremented by 4.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the value of the literal.
The ‘d’ bits select the destination register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an unsigned
value [0:255]. See Section 4.6 “Using 10-bit Literal Operands” for information on using 10-bit literal operands in Byte
mode.
Words:
1
Cycles:
3 (2 if exception pending)
Example 1:
000440
PC
W0
W15
Data 1984
Data 1986
SR
Example 2:
DS70157B-page 5-202
Before
Instruction
00 0440
9846
1988
7006
0000
0000
00050A
PC
W2
W15
Data 11FC
Data 11FE
SR
RETLW.B #0xA, W0
RETLW
Before
Instruction
00 050A
0993
1200
7008
0001
0000
; Return with 0xA in W0
After
Instruction
PC
00 7006
W0
980A
W15
1984
Data 1984
7006
Data 1986
0000
SR
0000
#0x230, W2
; Return with 0x230 in W2
PC
W2
W15
Data 11FC
Data 11FE
SR
Preliminary
After
Instruction
01 7008
0230
11FC
7008
0001
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RETURN
Return
Syntax:
{label:}
Operands:
None
Operation:
(W15) – 2 → W15
(TOS) → (PC<22:16>)
(W15) – 2 → W15
(TOS) → (PC<15:0>)
NOP → Instruction Register
Status Affected:
None
Encoding:
RETURN
0000
0110
0000
0000
0000
0000
Description:
Return from subroutine. The software stack is POPped twice to restore
the PC. Since two POPs are made, the Stack Pointer (W15) is
decremented by 4.
Words:
1
Cycles:
3 (2 if exception pending)
Example 1:
001A06
PC
W15
Data 1244
Data 1246
SR
Example 2:
Before
Instruction
00 1A06
1248
0004
0001
0000
005404
PC
W15
Data 0906
Data 0908
SR
RETURN
RETURN
Before
Instruction
00 5404
090A
0966
0000
0000
; Return from subroutine
After
Instruction
PC
01 0004
W15
1244
Data 1244
0004
Data 1246
0001
SR
0000
; Return from subroutine
After
Instruction
PC
00 0966
W15
0906
Data 0906
0966
Data 0908
0000
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-203
dsPIC30F/33F Programmer’s Reference Manual
RLC
Rotate Left f through Carry
Syntax:
{label:}
RLC{.B}
f
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(C) → Dest<0>
(f<6:0>) → Dest<7:1>
(f<7>) → C
For word operation:
(C) → Dest<0>
(f<14:0>) → Dest<15:1>
(f<15>) → C
{,WREG}
C
Status Affected:
N, Z, C
Encoding:
1101
Description:
0110
1BDf
ffff
ffff
ffff
Rotate the contents of the file register f one bit to the left through the
Carry flag and place the result in the destination register. The Carry flag
of the STATUS Register is shifted into the Least Significant bit of the
destination, and it is then overwritten with the Most Significant bit of Ws.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for f, ‘1’ for WREG).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
RLC.B
0x1233
Before
Instruction
Data 1232 E807
SR
0000
Example 2:
RLC
; Rotate Left w/ C (0x1233) (Byte mode)
After
Instruction
Data 1232 D007
SR
0009 (N, C = 1)
0x820, WREG
; Rotate Left w/ C (0x820) (Word mode)
; Store result in WREG
Before
After
Instruction
Instruction
WREG (W0)
5601
WREG (W0) 42DD
Data 0820 216E
Data 0820 216E
SR
0001 (C = 1)
SR
0000 (C = 0)
DS70157B-page 5-204
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RLC
Syntax:
Rotate Left Ws through Carry
{label:}
RLC{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(C) → Wd<0>
(Ws<6:0>) → Wd<7:1>
(Ws<7>) → C
For word operation:
(C) → Wd<0>
(Ws<14:0>) → Wd<15:1>
(Ws<15>) → C
C
Status Affected:
N, Z, C
Encoding:
Description:
1101
0010
1Bqq
qddd
dppp
ssss
Rotate the contents of the source register Ws one bit to the left through
the Carry flag and place the result in the destination register Wd. The
Carry flag of the STATUS register is shifted into the Least Significant bit
of Wd, and it is then overwritten with the Most Significant bit of Ws.
Either register direct or indirect addressing may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
RLC.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W3
© 2005 Microchip Technology Inc.
After
Instruction
W0
9976
W3 58ED
SR
0009 (N = 1)
Preliminary
5
Instruction
Descriptions
Before
Instruction
W0
9976
W3
5879
SR
0001 (C = 1)
; Rotate Left w/ C (W0) (Byte mode)
; Store the result in W3
DS70157B-page 5-205
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
RLC
[W2++], [W8]
; Rotate Left w/ C [W2] (Word mode)
; Post-increment W2
; Store result in [W8]
Before
After
Instruction
Instruction
W2
2008
W2 200A
W8 094E
W8 094E
Data 094E
3689
Data 094E
8082
Data 2008 C041
Data 2008 C041
SR
0001 (C = 1)
SR
0009 (N, C = 1)
DS70157B-page 5-206
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RLNC
Rotate Left f without Carry
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(f<6:0>) → Dest<7:1>
(f<7>) → Dest<0>
For word operation:
(f<14:0>) → Dest<15:1>
(f<15>) → Dest<0>
Status Affected:
N, Z
Encoding:
RLNC{.B}
1101
Description:
0110
f
{,WREG}
0BDf
ffff
ffff
ffff
Rotate the contents of the file register f one bit to the left and place the
result in the destination register. The Most Significant bit of f is stored in
the Least Significant bit of the destination, and the Carry flag is not
affected.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
RLNC.B
0x1233
Before
Instruction
Data 1232 E807
SR
0000
Example 2:
RLNC
; Rotate Left (0x1233) (Byte mode)
After
Instruction
Data 1233 D107
SR
0008 (N = 1)
0x820, WREG
; Rotate Left (0x820) (Word mode)
; Store result in WREG
Before
After
Instruction
Instruction
WREG (W0)
5601
WREG (W0) 42DC
Data 0820 216E
Data 0820 216E
SR
0001 (C = 1)
SR
0000 (C = 0)
Preliminary
Instruction
Descriptions
© 2005 Microchip Technology Inc.
5
DS70157B-page 5-207
dsPIC30F/33F Programmer’s Reference Manual
RLNC
Syntax:
Rotate Left Ws without Carry
{label:}
RLNC{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(Ws<6:0>) → Wd<7:1>
(Ws<7>) → Wd<0>
For word operation:
(Ws<14:0>) → Wd<15:1>
(Ws<15>) → Wd<0>
Status Affected:
N, Z
Encoding:
Description:
1101
0010
0Bqq
qddd
dppp
ssss
Rotate the contents of the source register Ws one bit to the left and
place the result in the destination register Wd. The Most Significant bit of
Ws is stored in the Least Significant bit of Wd, and the Carry flag is not
affected. Either register direct or indirect addressing may be used for
Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for byte, ‘1’ for word).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
RLNC.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W3
Before
Instruction
W0
9976
W3
5879
SR
0001 (C = 1)
DS70157B-page 5-208
; Rotate Left (W0) (Byte mode)
; Store the result in W3
After
Instruction
W0
9976
W3 58EC
SR
0009 (N, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
RLNC
[W2++], [W8] ; Rotate Left [W2] (Word mode)
; Post-increment W2
; Store result in [W8]
Before
After
Instruction
Instruction
W2
2008
W2 200A
W8 094E
W8 094E
Data 094E
3689
Data 094E
8083
Data 2008 C041
Data 2008 C041
SR
0001 (C = 1)
SR
0009 (N, C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-209
dsPIC30F/33F Programmer’s Reference Manual
RRC
Rotate Right f through Carry
Syntax:
{label:}
RRC{.B}
f
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(C) → Dest<7>
(f<7:1>) → Dest<6:0>
(f<0>) → C
For word operation:
(C) → Dest<15>
(f<15:1>) → Dest<14:0>
(f<0>) → C
{,WREG}
C
Status Affected:
N, Z, C
Encoding:
1101
Description:
0111
1BDf
ffff
ffff
ffff
Rotate the contents of the file register f one bit to the right through the
Carry flag and place the result in the destination register. The Carry flag
of the STATUS Register is shifted into the Most Significant bit of the
destination, and it is then overwritten with the Least Significant bit of Ws.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for byte, ‘1’ for word).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
RRC.B
0x1233
Before
Instruction
Data 1232 E807
SR
0000
Example 2:
RRC
; Rotate Right w/ C (0x1233) (Byte mode)
After
Instruction
Data 1232
7407
SR
0000
0x820, WREG
; Rotate Right w/ C (0x820) (Word mode)
; Store result in WREG
Before
After
Instruction
Instruction
WREG (W0)
5601
WREG (W0) 90B7
Data 0820 216E
Data 0820 216E
SR
0001 (C = 1)
SR
0008 (N = 1)
DS70157B-page 5-210
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RRC
Syntax:
Rotate Right Ws through Carry
{label:}
RRC{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(C) → Wd<7>
(Ws<7:1>) → Wd<6:0>
(Ws<0>) → C
For word operation:
(C) → Wd<15>
(Ws<15:1>) → Wd<14:0>
(Ws<0>) → C
C
Status Affected:
N, Z, C
Encoding:
Description:
1101
0011
1Bqq
qddd
dppp
ssss
Rotate the contents of the source register Ws one bit to the right through
the Carry flag and place the result in the destination register Wd. The
Carry flag of the STATUS Register is shifted into the Most Significant bit
of Wd, and it is then overwritten with the Least Significant bit of Ws.
Either register direct or indirect addressing may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
RRC.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W3
© 2005 Microchip Technology Inc.
5
After
Instruction
W0
9976
W3 58BB
SR
0008 (N = 1)
Preliminary
Instruction
Descriptions
Before
Instruction
W0
9976
W3
5879
SR
0001 (C = 1)
; Rotate Right w/ C (W0) (Byte mode)
; Store the result in W3
DS70157B-page 5-211
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
RRC
[W2++], [W8]
; Rotate Right w/ C [W2] (Word mode)
; Post-increment W2
; Store result in [W8]
Before
After
Instruction
Instruction
W2
2008
W2 200A
W8 094E
W8 094E
Data 094E
3689
Data 094E E020
Data 2008 C041
Data 2008 C041
SR
0001 (C = 1)
SR
0009 (N, C = 1)
DS70157B-page 5-212
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
RRNC
Rotate Right f without Carry
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
(f<7:1>) → Dest<6:0>
(f<0>) → Dest<7>
For word operation:
(f<15:1>) → Dest<14:0>
(f<0>) → Dest<15>
Status Affected:
N, Z
Encoding:
RRNC{.B}
1101
Description:
0111
f
{,WREG}
0BDf
ffff
ffff
ffff
Rotate the contents of the file register f one bit to the right and place the
result in the destination register. The Least Significant bit of f is stored in
the Most Significant bit of the destination, and the Carry flag is not
affected.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
RRNC.B
0x1233
Before
Instruction
Data 1232 E807
SR
0000
Example 2:
RRNC
; Rotate Right (0x1233) (Byte mode)
After
Instruction
Data 1232
7407
SR
0000
0x820, WREG
; Rotate Right (0x820) (Word mode)
; Store result in WREG
Before
After
Instruction
Instruction
WREG (W0)
5601
WREG (W0) 10B7
Data 0820 216E
Data 0820 216E
SR
0001 (C = 1)
SR
0001 (C = 1)
Preliminary
Instruction
Descriptions
© 2005 Microchip Technology Inc.
5
DS70157B-page 5-213
dsPIC30F/33F Programmer’s Reference Manual
RRNC
Syntax:
Rotate Right Ws without Carry
{label:}
RRNC{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(Ws<7:1>) → Wd<6:0>
(Ws<0>) → Wd<7>
For word operation:
(Ws<15:1>) → Wd<14:0>
(Ws<0>) → Wd<15>
Status Affected:
N, Z
Encoding:
Description:
1101
0011
0Bqq
qddd
dppp
ssss
Rotate the contents of the source register Ws one bit to the right and
place the result in the destination register Wd. The Least Significant bit
of Ws is stored in the Most Significant bit of Wd, and the Carry flag is not
affected. Either register direct or indirect addressing may be used for Ws
and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
RRNC.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W3
Before
Instruction
W0
9976
W3
5879
SR
0001 (C = 1)
DS70157B-page 5-214
; Rotate Right (W0) (Byte mode)
; Store the result in W3
After
Instruction
W0
9976
W3 583B
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
RRNC
[W2++], [W8]
Before
Instruction
W2
2008
W8 094E
Data 094E
3689
Data 2008 C041
SR
0000
; Rotate Right [W2] (Word mode)
; Post-increment W2
; Store result in [W8]
After
Instruction
W2 200A
W8 094E
Data 094E E020
Data 2008 C041
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-215
dsPIC30F/33F Programmer’s Reference Manual
SAC
Store Accumulator
Syntax:
{label:}
SAC
Acc,
{#Slit4,}
Wd
[Wd]
[Wd++]
[Wd--]
[--Wd]
[++Wd]
[Wd + Wb]
Operands:
Acc ∈ [A,B]
Slit4 ∈ [-8 ... +7]
Wb, Wd ∈ [W0 ... W15]
Operation:
ShiftSlit4(Acc) (optional)
(Acc[31:16]) → Wd
Status Affected:
None
Encoding:
1100
Description:
1100
Awww
wrrr
rhhh
dddd
Perform an optional, signed 4-bit shift of the specified accumulator, then
store the shifted contents of ACCxH (Acc[31:16]) to Wd. The shift range
is -8:7, where a negative operand indicates an arithmetic left shift and a
positive operand indicates an arithmetic right shift. Either register direct
or indirect addressing may be used for Wd.
The ‘A’ bit specifies the source accumulator.
The ‘w’ bits specify the offset register Wb.
The ‘r’ bits encode the optional accumulator pre-shift.
The ‘h’ bits select the destination Address mode.
The ‘d’ bits specify the destination register Wd.
Note 1: This instruction does not modify the contents of Acc.
2: This instruction stores the truncated contents of Acc. The
instruction SAC.R may be used to store the rounded
accumulator contents.
3: If Data Write saturation is enabled (SATDW, CORCON<5>,
= 1), the value stored to Wd is subject to saturation after the
optional shift is performed.
Words:
1
Cycles:
1
Example 1:
SAC A, #4, W5
; Right shift ACCA by 4
; Store result to W5
; CORCON = 0x0010 (SATDW = 1)
W5
ACCA
CORCON
SR
DS70157B-page 5-216
Before
Instruction
B900
00 120F FF00
0010
0000
Preliminary
W5
ACCA
CORCON
SR
After
Instruction
0120
00 120F FF00
0010
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
SAC B, #-4, [W5++]
; Left shift ACCB by 4
; Store result to [W5], Post-increment W5
; CORCON = 0x0010 (SATDW = 1)
W5
ACCB
Data 2000
CORCON
SR
Before
Instruction
2000
FF C891 8F4C
5BBE
0010
0000
W5
ACCB
Data 2000
CORCON
SR
After
Instruction
2002
FF C891 1F4C
8000
0010
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-217
dsPIC30F/33F Programmer’s Reference Manual
SAC.R
Store Rounded Accumulator
Syntax:
{label:}
SAC.R
Acc,
{#Slit4,}
Wd
[Wd]
[Wd++]
[Wd--]
[--Wd]
[++Wd]
[Wd + Wb]
Operands:
Acc ∈ [A,B]
Slit4 ∈ [-8 ... +7]
Wb ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
ShiftSlit4(Acc) (optional)
Round(Acc)
(Acc[31:16]) → Wd
Status Affected:
None
Encoding:
1100
Description:
1101
Awww
wrrr
rhhh
dddd
Perform an optional, signed 4-bit shift of the specified accumulator, then
store the rounded contents of ACCxH (Acc[31:16]) to Wd. The shift
range is -8:7, where a negative operand indicates an arithmetic left shift
and a positive operand indicates an arithmetic right shift. The Rounding
mode (Conventional or Convergent) is set by the RND bit,
CORCON<1>. Either register direct or indirect addressing may be used
for Wd.
The ‘A’ bit specifies the source accumulator.
The ‘w’ bits specify the offset register Wb.
The ‘r’ bits encode the optional accumulator pre-shift.
The ‘h’ bits select the destination Address mode.
The ‘d’ bits specify the destination register Wd.
Note 1: This instruction does not modify the contents of the Acc.
2: This instruction stores the rounded contents of Acc. The
instruction SAC may be used to store the truncated
accumulator contents.
3: If Data Write saturation is enabled (SATDW, CORCON<5>,
= 1), the value stored to Wd is subject to saturation after the
optional shift is performed.
Words:
1
Cycles:
1
Example 1:
SAC.R A, #4, W5
; Right shift ACCA by 4
; Store rounded result to W5
; CORCON = 0x0010 (SATDW = 1)
W5
ACCA
CORCON
SR
DS70157B-page 5-218
Before
Instruction
B900
00 120F FF00
0010
0000
Preliminary
W5
ACCA
CORCON
SR
After
Instruction
0121
00 120F FF00
0010
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
SAC.R B, #-4, [W5++]
; Left shift ACCB by 4
; Store rounded result to [W5], Post-increment W5
; CORCON = 0x0010 (SATDW = 1)
W5
ACCB
Data 2000
CORCON
SR
Before
Instruction
2000
FF F891 8F4C
5BBE
0010
0000
W5
ACCB
Data 2000
CORCON
SR
After
Instruction
2002
FF F891 8F4C
8919
0010
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-219
dsPIC30F/33F Programmer’s Reference Manual
SE
Sign-Extend Ws
Syntax:
{label:}
SE
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
Ws<7:0> → Wnd<7:0>
If (Ws<7> = 1):
0xFF → Wnd<15:8>
Else:
0 → Wnd<15:8>
Status Affected:
N, Z, C
Encoding:
1111
Description:
1011
0000
0ddd
dppp
ssss
Sign-extend the byte in Ws and store the 16-bit result in Wnd. Either
register direct or indirect addressing may be used for Ws, and register
direct addressing must be used for Wnd. The C flag is set to the
complement of the N flag.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This operation converts a byte to a word, and it uses no .B or
.W extension.
2: The source Ws is addressed as a byte operand, so any
address modification is by ‘1’.
Words:
1
Cycles:
1
Example 1:
SE
W3, W4
; Sign-extend W3 and store to W4
Before
Instruction
W3
7839
W4
1005
SR
0000
Example 2:
SE
[W2++], W12
Before
Instruction
W2
0900
W12
1002
Data 0900
008F
SR
0000
DS70157B-page 5-220
After
Instruction
W3
7839
W4
0039
SR
0001 (C = 1)
; Sign-extend [W2] and store to W12
; Post-increment W2
After
Instruction
W2
0901
W12 FF8F
Data 0900
008F
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SETM
Set f or WREG
Syntax:
{label:}
SETM{.B}
f
WREG
Operands:
f ∈ [0 ... 8191]
Operation:
For byte operation:
0xFF → destination designated by D
For word operation:
0xFFFF → destination designated by D
Status Affected:
None
Encoding:
1110
Description:
1111
1BDf
ffff
ffff
ffff
All the bits of the specified register are set to ‘1’. If WREG is specified,
the bits of WREG are set. Otherwise, the bits of the specified file register
are set.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
SETM.B
0x891
Before
Instruction
Data 0890
2739
SR
0000
Example 2:
SETM
WREG
Before
Instruction
WREG (W0)
0900
SR
0000
; Set 0x891 (Byte mode)
After
Instruction
Data 0890 FF39
SR
0000
; Set WREG (Word mode)
After
Instruction
WREG (W0) FFFF
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-221
dsPIC30F/33F Programmer’s Reference Manual
SETM
Set Ws
Syntax:
{label:}
SETM{.B}
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
0xFF → Wd for byte operation
For word operation:
0xFFFF → Wd for word operation
Status Affected:
None
Encoding:
1110
Description:
1011
1Bqq
qddd
d000
0000
All the bits of the specified register are set to ‘1’. Either register direct or
indirect addressing may be used for Wd.
The ‘B’ bits selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
Note:
Words:
1
Cycles:
1
Example 1:
SETM.B
W13
Before
Instruction
W13
2739
SR
0000
Example 2:
SETM
[--W6]
Before
Instruction
W6
1250
Data 124E 3CD9
SR
0000
DS70157B-page 5-222
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Set W13 (Byte mode)
After
Instruction
W13 27FF
SR
0000
; Pre-decrement W6 (Word mode)
; Set [W6]
After
Instruction
W6 124E
Data 124E FFFF
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SFTAC
Arithmetic Shift Accumulator by Slit6
Syntax:
{label:}
Operands:
Acc ∈ [A,B]
Slit6 ∈ [-16 ... 16]
Operation:
Shiftk(Acc) → Acc
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
1100
Description:
SFTAC
1000
Acc,
#Slit6
A000
0000
01kk
kkkk
Arithmetic shift the 40-bit contents of the specified accumulator by the
signed, 6-bit literal and store the result back into the accumulator. The
shift range is -16:16, where a negative operand indicates a left shift and
a positive operand indicates a right shift. Any bits which are shifted out of
the accumulator are lost.
The ‘A’ bit selects the accumulator for the result.
The ‘k’ bits determine the number of bits to be shifted.
Note 1: If saturation is enabled for the target accumulator (SATA,
CORCON<7> or SATB, CORCON<6>), the value stored to
the accumulator is subject to saturation.
2: If the shift amount is greater than 16 or less than -16, no
modification will be made to the accumulator, and an
arithmetic trap will occur.
Words:
1
Cycles:
1
Example 1:
SFTAC A, #12
; Arithmetic right shift ACCA by 12
; Store result to ACCA
; CORCON = 0x0080 (SATA = 1)
ACCA
CORCON
SR
Example 2:
Before
Instruction
00 120F FF00
0080
0000
After
Instruction
00 0001 20FF
0080
0000
ACCA
CORCON
SR
SFTAC B, #-10
; Arithmetic left shift ACCB by 10
; Store result to ACCB
; CORCON = 0x0040 (SATB = 1)
ACCB
CORCON
SR
Before
Instruction
FF FFF1 8F4C
0040
0000
ACCB
CORCON
SR
After
Instruction
FF C63D 3000
0040
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-223
dsPIC30F/33F Programmer’s Reference Manual
SFTAC
Arithmetic Shift Accumulator by Wb
Syntax:
{label:}
Operands:
Acc ∈ [A,B]
Wb ∈ [W0 ... W15]
Operation:
Shift(Wb)(Acc) → Acc
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
1100
Description:
SFTAC
1000
Acc,
A000
Wb
0000
0000
ssss
Arithmetic shift the 40-bit contents of the specified accumulator and
store the result back into the accumulator. The Least Significant 6 bits of
Wb are used to specify the shift amount. The shift range is -16:16,
where a negative value indicates a left shift and a positive value
indicates a right shift. Any bits which are shifted out of the accumulator
are lost.
The ‘A’ bit selects the accumulator for the source/destination.
The ‘s’ bits select the address of the shift count register.
Note 1: If saturation is enabled for the target accumulator (SATA,
CORCON<7> or SATB, CORCON<6>), the value stored to
the accumulator is subject to saturation.
2: If the shift amount is greater than 16 or less than -16, no
modification will be made to the accumulator, and an
arithmetic trap will occur.
Words:
1
Cycles:
1
Example 1:
SFTAC A, W0
; Arithmetic shift ACCA by (W0)
; Store result to ACCA
; CORCON = 0x0000 (saturation disabled)
W0
ACCA
CORCON
SR
Example 2:
W0
ACCA
CORCON
SR
After
Instruction
FFFC
03 20FA B090
0000
8800 (OA, OAB = 1)
SFTAC B, W12
; Arithmetic shift ACCB by (W12)
; Store result to ACCB
; CORCON = 0x0040 (SATB = 1)
W12
ACCB
CORCON
SR
DS70157B-page 5-224
Before
Instruction
FFFC
00 320F AB09
0000
0000
Before
Instruction
000F
FF FFF1 8F4C
0040
0000
Preliminary
W12
ACCB
CORCON
SR
After
Instruction
000F
FF FFFF FFE3
0040
0000
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SL
Shift Left f
Syntax:
{label:}
SL{.B}
Operands:
f ∈ [0... 8191]
Operation:
For byte operation:
(f<7>) → (C)
(f<6:0>) → Dest<7:1>
0 → Dest<0>
For word operation:
(f<15>) → (C)
(f<14:0>) → Dest<15:1>
0 → Dest<0>
C
Status Affected:
{,WREG}
0
N, Z, C
Encoding:
1101
Description:
f
0100
0BDf
ffff
ffff
ffff
Shift the contents of the file register one bit to the left and place the
result in the destination register. The Most Significant bit of the file
register is shifted into the Carry bit of the STATUS register, and zero is
shifted into the Least Significant bit of the destination register.
The optional WREG operand determines the destination register. If
WREG is specified, the result is stored in WREG. If WREG is not
specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
SL.B
0x909
Before
Instruction
Data 0908
9439
SR
0000
Example 2:
SL
After
Instruction
Data 0908
0839
SR
0001 (C = 1)
0x1650, WREG
; Shift left (0x1650) (Word mode)
; Store result in WREG
After
Instruction
WREG (W0) 80CA
Data 1650
4065
SR
0008 (N = 1)
Preliminary
5
Instruction
Descriptions
Before
Instruction
WREG (W0)
0900
Data 1650
4065
SR
0000
© 2005 Microchip Technology Inc.
; Shift left (0x909) (Byte mode)
DS70157B-page 5-225
dsPIC30F/33F Programmer’s Reference Manual
SL
Shift Left Ws
Syntax:
{label:}
SL{.B}
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
(Ws<7>) → C
(Ws<6:0>) → Wd<7:1>
0 → Wd<0>
For word operation:
(Ws<15>) → C
(Ws<14:0>) → Wd<15:1>
0 → Wd<0>
C
Status Affected:
0
N, Z, C
Encoding:
1101
Description:
0000
0Bqq
qddd
dppp
ssss
Shift the contents of the source register Ws one bit to the left and place
the result in the destination register Wd. The Most Significant bit of Ws is
shifted into the Carry bit of the STATUS register, and ‘0’ is shifted into
the Least Significant bit of Wd. Either register direct or indirect addressing may be used for Ws and Wd.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
SL.B
W3, W4
Before
Instruction
W3 78A9
W4
1005
SR
0000
DS70157B-page 5-226
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Shift left W3 (Byte mode)
; Store result to W4
After
Instruction
W3 78A9
W4
1052
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
SL
[W2++], [W12]
Before
Instruction
W2
0900
W12
1002
Data 0900
800F
Data 1002
6722
SR
0000
; Shift left [W2] (Word mode)
; Store result to [W12]
; Post-increment W2
After
Instruction
W2
0902
W12
1002
Data 0900
800F
Data 1002 001E
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-227
dsPIC30F/33F Programmer’s Reference Manual
SL
Shift Left by Short Literal
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
lit4 ∈ [0...15]
Wnd ∈ [W0 ... W15]
Operation:
lit4<3:0> → Shift_Val
Wnd<15:Shift_Val> = Wb<15-Shift_Val:0>
Wd<Shift_Val – 1:0> = 0
Status Affected:
N, Z
Encoding:
SL
1101
Description:
Wb,
1101
0www
#lit4,
wddd
Wnd
d100
kkkk
Shift left the contents of the source register Wb by the 4-bit unsigned
literal and store the result in the destination register Wnd. Any bits
shifted out of the source register are lost. Direct addressing must be
used for Wb and Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
SL
This instruction operates in Word mode only.
W2, #4, W2
Before
Instruction
W2 78A9
SR
0000
Example 2:
SL
W3, #12, W8
Before
Instruction
W3
0912
W8
1002
SR
0000
DS70157B-page 5-228
; Shift left W2 by 4
; Store result to W2
After
Instruction
W2 8A90
SR
0008 (N = 1)
; Shift left W3 by 12
; Store result to W8
After
Instruction
W3
0912
W8
2000
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SL
Shift Left by Wns
Syntax:
{label:}
Operands:
Wb ∈ [W0 ... W15]
Wns ∈ [W0 ...W15]
Wnd ∈ [W0 ... W15]
Operation:
Wns<4:0> → Shift_Val
Wnd<15:Shift_Val> = Wb<15 – Shift_Val:0>
Wd<Shift_Val – 1:0> = 0
Status Affected:
N, Z
Encoding:
1101
Description:
SL
Wb,
1101
0www
Wns,
Wnd
wddd
d000
ssss
Shift left the contents of the source register Wb by the 5 Least
Significant bits of Wns (only up to 15 positions) and store the result in
the destination register Wnd. Any bits shifted out of the source register
are lost. Register direct addressing must be used for Wb, Wns and
Wnd.
The ‘w’ bits select the address of the base register.
The ‘d’ bits select the destination register.
The ‘s’ bits select the source register.
Note 1: This instruction operates in Word mode only.
2: If Wns is greater than 15, Wnd will be loaded with 0x0.
Words:
1
Cycles:
1
Example 1:
SL
W0, W1, W2
Before
Instruction
W0 09A4
W1
8903
W2 78A9
SR
0000
Example 2:
SL
W4, W5, W6
Before
Instruction
W4 A409
W5 FF01
W6
0883
SR
0000
; Shift left W0 by W1<0:4>
; Store result to W2
After
Instruction
W0 09A4
W1
8903
W2 4D20
SR
0000
; Shift left W4 by W5<0:4>
; Store result to W6
After
Instruction
W4 A409
W5 FF01
W6
4812
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-229
dsPIC30F/33F Programmer’s Reference Manual
SUB
Subtract WREG from f
Syntax:
{label:}
SUB{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) – (WREG) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
1011
Description:
0101
0BDf
ffff
ffff
ffff
Subtract the contents of the default working register WREG from the
contents of the specified file register, and place the result in the
destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG.
If WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
SUB.B 0x1FFF
Before
Instruction
WREG (W0)
7804
Data 1FFE
9439
SR
0000
Example 2:
SUB
After
Instruction
WREG (W0)
7804
Data 1FFE
9039
SR
0009 (N, C = 1)
0xA04, WREG
Before
Instruction
WREG (W0)
6234
Data 0A04
4523
SR
0000
DS70157B-page 5-230
; Sub. WREG from (0x1FFF) (Byte mode)
; Store result to 0x1FFF
; Sub. WREG from (0xA04) (Word mode)
; Store result to WREG
After
Instruction
WREG (W0) E2EF
Data 0A04
4523
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUB
Subtract Literal from Wn
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
(Wn) – lit10 → Wn
Status Affected:
DC, N, OV, Z, C
Encoding:
SUB{.B}
1011
Description:
#lit10,
0001
0Bkk
Wn
kkkk
kkkk
dddd
Subtract the 10-bit unsigned literal operand from the contents of the
working register Wn, and store the result back in the working register
Wn. Register direct addressing must be used for Wn.
The ‘B’ bit selects byte or word operation.
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an
unsigned value [0:255]. See Section 4.6 “Using 10-bit Literal Operands” for information on using 10-bit literal
operands in Byte mode.
Words:
1
Cycles:
1
Example 1:
SUB.B
#0x23, W0
Before
Instruction
W0
7804
SR
0000
Example 2:
SUB
#0x108, W4
Before
Instruction
W4
6234
SR
0000
; Sub. 0x23 from W0 (Byte mode)
; Store result to W0
After
Instruction
W0 78E1
SR
0008 (N = 1)
; Sub. 0x108 from W4 (Word mode)
; Store result to W4
After
Instruction
W4 612C
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-231
dsPIC30F/33F Programmer’s Reference Manual
SUB
Subtract Short Literal from Wb
Syntax:
{label:}
SUB{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb) – lit5 → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0101
Description:
0www
wBqq
qddd
d11k
kkkk
Subtract the 5-bit unsigned literal operand from the contents of the base
register Wb, and place the result in the destination register Wd. Register
direct addressing must be used for Wb. Register direct or indirect
addressing must be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
SUB.B
W4, #0x10, W5
Before
Instruction
W4
1782
W5
7804
SR
0000
Example 2:
SUB
; Sub. 0x10 from W4 (Byte mode)
; Store result to W5
After
Instruction
W4
1782
W5
7872
SR
0005 (OV, C = 1)
W0, #0x8, [W2++]
Before
Instruction
W0
F230
W2
2004
Data 2004 A557
SR
0000
DS70157B-page 5-232
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Sub. 0x8 from W0 (Word mode)
; Store result to [W2]
; Post-increment W2
After
Instruction
W0
F230
W2
2006
Data 2004
F228
SR
0009 (N, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUB
Subtract Ws from Wb
Syntax:
{label:}
SUB{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb) – (Ws) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0101
Description:
Wb,
0www
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Subtract the contents of the source register Ws from the contents of the
base register Wb and place the result in the destination register Wd.
Register direct addressing must be used for Wb. Either register direct or
indirect addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
SUB.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W1, W0
Before
Instruction
W0
1732
W1
7844
SR
0000
; Sub. W1 from W0 (Byte mode)
; Store result to W0
After
Instruction
W0 17EE
W1
7844
SR
0108 (DC, N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-233
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
SUB
W7, [W8++], [W9++]
Before
Instruction
W7
2450
W8
1808
W9
2020
Data 1808 92E4
Data 2022 A557
SR
0000
DS70157B-page 5-234
;
;
;
;
Sub. [W8] from W7 (Word mode)
Store result to [W9]
Post-increment W8
Post-increment W9
After
Instruction
W7
2450
W8 180A
W9
2022
Data 1808 92E4
Data 2022 916C
SR 010C (DC, N, OV = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUB
Subtract Accumulators
Syntax:
{label:}
Operands:
Acc ∈ [A,B]
Operation:
If (Acc = A):
ACCA – ACCB → ACCA
Else:
ACCB – ACCA → ACCB
Status Affected:
OA, OB, OAB, SA, SB, SAB
Encoding:
SUB
1100
Description:
1011
Acc
A011
0000
0000
0000
Subtract the contents of the unspecified accumulator from the contents
of Acc, and store the result back into Acc. This instruction performs a
40-bit subtraction.
The ‘A’ bit specifies the destination accumulator.
Words:
1
Cycles:
1
Example 1:
SUB
ACCA
ACCB
CORCON
SR
Example 2:
SUB
ACCA
ACCB
CORCON
SR
A
; Subtract ACCB from ACCA
; Store the result to ACCA
; CORCON = 0x0000 (no saturation)
Before
Instruction
76 120F 098A
23 F312 BC17
0000
0000
B
ACCA
ACCB
CORCON
SR
After
Instruction
52 1EFC 4D73
23 F312 BC17
0000
1100 (OA, OB = 1)
; Subtract ACCA from ACCB
; Store the result to ACCB
; CORCON = 0x0040 (SATB = 1)
Before
Instruction
FF 9022 2EE1
00 2456 8F4C
0040
0000
ACCA
ACCB
CORCON
SR
After
Instruction
FF 9022 2EE1
00 7FFF FFFF
0040
1400 (SB, SAB = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-235
dsPIC30F/33F Programmer’s Reference Manual
SUBB
Subtract WREG and Carry bit from f
Syntax:
{label:}
SUBB{.B}
f
{,WREG}
Operands:
f ∈ [0 ... 8191]
Operation:
(f) – (WREG) – (C) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1011
0101
1BDf
ffff
ffff
ffff
Subtract the contents of the default working register WREG and the
Borrow flag (Carry flag inverse, C) from the contents of the specified file
register and place the result in the destination register. The optional
WREG operand determines the destination register. If WREG is
specified, the result is stored in WREG. If WREG is not specified, the
result is stored in the file register
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBB.B 0x1FFF
Before
Instruction
WREG (W0)
7804
Data 1FFE
9439
SR
0000
Example 2:
After
Instruction
WREG (W0)
7804
Data 1FFE
8F39
SR
0008 (N = 1)
SUBB 0xA04, WREG
Before
Instruction
WREG (W0)
6234
Data 0A04
6235
SR
0000
DS70157B-page 5-236
; Sub. WREG and C from (0x1FFF) (Byte mode)
; Store result to 0x1FFF
; Sub. WREG and C from (0xA04) (Word mode)
; Store result to WREG
After
Instruction
WREG (W0)
0000
Data 0A04
6235
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBB
Subtract Wn from Literal with Borrow
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
(Wn) – lit10 – (C) → Wn
Status Affected:
DC, N, OV, Z, C
Encoding:
SUBB{.B}
1011
Description:
0001
#lit10,
1Bkk
Wn
kkkk
kkkk
dddd
Subtract the unsigned 10-bit literal operand and the Borrow flag (Carry
flag inverse, C) from the contents of the working register Wn, and store
the result back in the working register Wn. Register direct addressing
must be used for Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .w extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an
unsigned value [0:255]. See Section 4.6 “Using 10-bit Literal Operands” for information on using 10-bit literal
operands in Byte mode.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBB.B
#0x23, W0
Before
Instruction
W0
7804
SR
0000
Example 2:
SUBB
#0x108, W4
Before
Instruction
W4
6234
SR
0001 (C = 1)
; Sub. 0x23 and C from W0 (Byte mode)
; Store result to W0
After
Instruction
W0 78E0
SR
0108 (DC, N = 1)
; Sub. 0x108 and C from W4 (Word mode)
; Store result to W4
After
Instruction
W4 612C
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-237
dsPIC30F/33F Programmer’s Reference Manual
SUBB
Subtract Short Literal from Wb with Borrow
Syntax:
{label:}
SUBB{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
(Wb) – lit5 – (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0101
Description:
1www
wBqq
qddd
d11k
kkkk
Subtract the 5-bit unsigned literal operand and the Borrow flag (Carry
flag inverse, C) from the contents of the base register Wb and place the
result in the destination register Wd. Register direct addressing must be
used for Wb. Either register direct or indirect addressing may be used
for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBB.B
W4, #0x10, W5
Before
Instruction
W4
1782
W5
7804
SR
0000
Example 2:
SUBB
; Sub. 0x10 and C from W4 (Byte mode)
; Store result to W5
After
Instruction
W4
1782
W5
7871
SR
0005 (OV, C = 1)
W0, #0x8, [W2++]
; Sub. 0x8 and C from W0 (Word mode)
; Store result to [W2]
; Post-increment W2
Before
After
Instruction
Instruction
W0
0009
W0
0009
W2
2004
W2
2006
Data 2004 A557
Data 2004
0000
SR
0020 (Z = 1)
SR
0103 (DC, Z, C = 1)
DS70157B-page 5-238
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBB
Subtract Ws from Wb with Borrow
Syntax:
{label:}
SUBB{.B}
Wb,
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operands:
Operation:
(Wb) – (Ws) – (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0101
Description:
1www
wBqq
qddd
dppp
ssss
Subtract the contents of the source register Ws and the Borrow flag
(Carry flag inverse, C) from the contents of the base register Wb, and
place the result in the destination register Wd. Register direct
addressing must be used for Wb. Register direct or indirect addressing
may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension
to denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBB.B
W0, W1, W0
Before
Instruction
W0
1732
W1
7844
SR
0000
; Sub. W1 and C from W0 (Byte mode)
; Store result to W0
After
Instruction
W0 17ED
W1
7844
SR
0108 (DC, N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-239
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
SUBB
W7,[W8++],[W9++] ;
;
;
;
Before
Instruction
W7
2450
W8
1808
W9
2022
Data 1808 92E4
Data 2022 A557
SR
0000
DS70157B-page 5-240
Sub. [W8] and C from W7 (Word mode)
Store result to [W9]
Post-increment W8
Post-increment W9
After
Instruction
W7
2450
W8 180A
W9
2024
Data 1808 92E4
Data 2022 916C
SR 010C (DC, N, OV = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBBR
Subtract f from WREG with Borrow
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(WREG) – (f) – (C) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
1011
SUBBR{.B} f
1101
{,WREG}
1BDf
ffff
ffff
ffff
Subtract the contents of the specified file register f and the Borrow flag
(Carry flag inverse, C) from the contents of WREG, and place the result
in the destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG.
If WREG is not specified, the result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
3: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBBR.B 0x803
; Sub. (0x803) and C from WREG (Byte mode)
; Store result to 0x803
Before
After
Instruction
Instruction
WREG (W0)
7804
WREG (W0)
7804
Data 0802
9439
Data 0802
6F39
SR
0002 (Z = 1)
SR
0000
Example 2:
SUBBR 0xA04, WREG ; Sub. (0xA04) and C from WREG (Word mode)
; Store result to WREG
Before
Instruction
WREG (W0)
6234
Data 0A04
6235
SR
0000
After
Instruction
WREG (W0) FFFE
Data 0A04
6235
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-241
dsPIC30F/33F Programmer’s Reference Manual
SUBBR
Subtract Wb from Short Literal with Borrow
Syntax:
{label:}
SUBBR{.B} Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
lit5 – (Wb) – (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0001
Description:
1www
wBqq
qddd
d11k
kkkk
Subtract the contents of the base register Wb and the Borrow flag (Carry
flag inverse, C) from the 5-bit unsigned literal and place the result in the
destination register Wd. Register direct addressing must be used for
Wb. Register direct or indirect addressing must be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBBR.B
W0, #0x10, W1 ; Sub. W0 and C from 0x10 (Byte mode)
; Store result to W1
Before
Instruction
W0
F310
W1 786A
SR
0003 (Z, C = 1)
Example 2:
SUBBR
After
Instruction
W0
F310
W1
7800
SR
0103 (DC, Z, C = 1)
W0, #0x8, [W2++] ; Sub. W0 and C from 0x8 (Word mode)
; Store result to [W2]
; Post-increment W2
Before
After
Instruction
Instruction
W0
0009
W0
0009
W2
2004
W2
2006
Data 2004 A557
Data 2004 FFFE
SR
0020 (Z = 1)
SR
0108 (DC, N = 1)
DS70157B-page 5-242
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBBR
Syntax:
Subtract Wb from Ws with Borrow
{label:}
SUBBR{.B} Wb,
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) – (Wb) – (C) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
Description:
0001
1www
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Subtract the contents of the base register Wb and the Borrow flag (Carry
flag inverse, C) from the contents of the source register Ws and place
the result in the destination register Wd. Register direct addressing must
be used for Wb. Register direct or indirect addressing may be used for
Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The Z flag is “sticky” for ADDC, CPB, SUBB and SUBBR.
These instructions can only clear Z.
Words:
1
Cycles:
1
Example 1:
SUBBR.B
W0, W1, W0
Before
Instruction
W0
1732
W1
7844
SR
0000
; Sub. W0 and C from W1 (Byte mode)
; Store result to W0
After
Instruction
W0
1711
W1
7844
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-243
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
SUBBR W7,[W8++],[W9++] ;
;
;
;
Before
Instruction
W7
2450
W8
1808
W9
2022
Data 1808 92E4
Data 2022 A557
SR
0000
DS70157B-page 5-244
Sub. W7 and C from [W8] (Word mode)
Store result to [W9]
Post-increment W8
Post-increment W9
After
Instruction
W7
2450
W8 180A
W9
2024
Data 1808 92E4
Data 2022 6E93
SR
0005 (OV, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBR
Subtract f from WREG
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(WREG) – (f) → destination designated by D
Status Affected:
DC, N, OV, Z, C
Encoding:
SUBR{.B} f
1011
Description:
1101
{,WREG}
0BDf
ffff
ffff
ffff
Subtract the contents of the specified file register from the contents of
the default working register WREG, and place the result in the
destination register. The optional WREG operand determines the
destination register. If WREG is specified, the result is stored in WREG.
If WREG is not specified, the result is stored in the file register
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
SUBR.B
0x1FFF
Before
Instruction
WREG (W0)
7804
Data 1FFE
9439
SR
0000
Example 2:
SUBR
; Sub. (0x1FFF) from WREG (Byte mode)
; Store result to 0x1FFF
After
Instruction
WREG (W0)
7804
Data 1FFE
7039
SR
0000
0xA04, WREG
Before
Instruction
WREG (W0)
6234
Data 0A04
6235
SR
0000
; Sub. (0xA04) from WREG (Word mode)
; Store result to WREG
After
Instruction
WREG (W0) FFFF
Data 0A04
6235
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-245
dsPIC30F/33F Programmer’s Reference Manual
SUBR
Subtract Wb from Short Literal
Syntax:
{label:}
SUBR{.B}
Wb,
#lit5
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Operands:
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operation:
lit5 – (Wb) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0001
Description:
0www
wBqq
qddd
d11k
kkkk
Subtract the contents of the base register Wb from the unsigned 5-bit
literal operand, and place the result in the destination register Wd.
Register direct addressing must be used for Wb. Either register direct or
indirect addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a five-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
SUBR.B
W0, #0x10, W1
Before
Instruction
W0
F310
W1 786A
SR
0000
Example 2:
SUBR
; Sub. W0 from 0x10 (Byte mode)
; Store result to W1
After
Instruction
W0
F310
W1
7800
SR
0103 (DC, Z, C = 1)
W0, #0x8, [W2++]
Before
Instruction
W0
0009
W2
2004
Data 2004 A557
SR
0000
DS70157B-page 5-246
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; Sub. W0 from 0x8 (Word mode)
; Store result to [W2]
; Post-increment W2
After
Instruction
W0
0009
W2
2006
Data 2004 FFFF
SR
0108 (DC, N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SUBR
Subtract Wb from Ws
Syntax:
{label:}
SUBR{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Ws) – (Wb) → Wd
Status Affected:
DC, N, OV, Z, C
Encoding:
0001
Description:
0www
Wb,
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Subtract the contents of the base register Wb from the contents of the
source register Ws and place the result in the destination register Wd.
Register direct addressing must be used for Wb. Either register direct or
indirect addressing may be used for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
SUBR.B
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0, W1, W0
Before
Instruction
W0
1732
W1
7844
SR
0000
; Sub. W0 from W1 (Byte mode)
; Store result to W0
After
Instruction
W0
1712
W1
7844
SR
0001 (C = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-247
dsPIC30F/33F Programmer’s Reference Manual
Example 2:
SUBR
W7, [W8++], [W9++]
Before
Instruction
W7
2450
W8
1808
W9
2022
Data 1808 92E4
Data 2022 A557
SR
0000
DS70157B-page 5-248
;
;
;
;
Sub. W7 from [W8] (Word mode)
Store result to [W9]
Post-increment W8
Post-increment W9
After
Instruction
W7
2450
W8 180A
W9
2024
Data 1808 92E4
Data 2022 6E94
SR
0005 (OV, C = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
SWAP
Byte or Nibble Swap Wn
Syntax:
{label:}
Operands:
Wn ∈ [W0 ... W15]
Operation:
For byte operation:
(Wn)<7:4> ↔ (Wn)<3:0>
For word operation:
(Wn)<15:8> ↔ (Wn)<7:0>
Status Affected:
None
Encoding:
1111
Description:
SWAP{.B} Wn
1101
1B00
0000
0000
ssss
Swap the contents of the working register Wn. In Word mode, the two
bytes of Wn are swapped. In Byte mode, the two nibbles of the Least
Significant Byte of Wn are swapped, and the Most Significant Byte of
Wn is unchanged. Register direct addressing must be used for Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘s’ bits select the address of the working register.
Note:
Words:
1
Cycles:
1
Example 1:
SWAP.B
W0
; Nibble swap (W0)
Before
Instruction
W0 AB87
SR
0000
Example 2:
SWAP
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
W0
After
Instruction
W0 AB78
SR
0000
; Byte swap (W0)
Before
Instruction
W0
8095
SR
0000
After
Instruction
W0
9580
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-249
dsPIC30F/33F Programmer’s Reference Manual
TBLRDH
Syntax:
Table Read High
{label:}
TBLRDH{.B} [Ws],
[Ws++],
Wd
[Wd]
[Ws--],
[Wd++]
[++Ws],
[Wd--]
[--Ws],
[++Wd]
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
If (LSB(Ws) = 1)
0 → Wd
Else
Program Mem [(TBLPAG),(Ws)] <23:16> → Wd
For word operation:
Program Mem [(TBLPAG),(Ws)] <23:16> → Wd <7:0>
0 → Wd <15:8>
Status Affected:
None
Encoding:
Description:
1011
1010
1Bqq
qddd
dppp
ssss
Read the contents of the most significant word of program memory and
store it to the destination register Wd. The target word address of program
memory is formed by concatenating the 8-bit Table Pointer register,
TBLPAG<7:0>, with the effective address specified by Ws. Indirect
addressing must be used for Ws, and either register direct or indirect
addressing may be used for Wd.
In Word mode, zero is stored to the Most Significant Byte of the destination
register (due to non-existent program memory) and the third program
memory byte (PM<23:16>) at the specified program memory address is
stored to the Least Significant Byte of the destination register.
In Byte mode, the source address depends on the contents of Ws. If Ws is
not word-aligned, zero is stored to the destination register (due to
non-existent program memory). If Ws is word-aligned, the third program
memory byte (PM<23:16>) at the specified program memory address is
stored to the destination register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
DS70157B-page 5-250
Words:
1
Cycles:
2
The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 1:
TBLRDH.B
W0
W1
Data 0F70
Program 01 0812
TBLPAG
SR
Example 2:
Before
Instruction
0812
0F71
0944
EF 2042
0001
0000
TBLRDH
W6
W8
Program 00 3406
TBLPAG
SR
[W0], [W1++]
After
Instruction
W0
0812
W1
0F72
Data 0F70
EF44
Program 01 0812
EF 2042
TBLPAG
0001
SR
0000
[W6++], W8
Before
Instruction
3406
65B1
29 2E40
0000
0000
; Read PM (TBLPAG:[W0]) (Byte mode)
; Store to [W1]
; Post-increment W1
; Read PM (TBLPAG:[W6]) (Word mode)
; Store to W8
; Post-increment W6
After
Instruction
W6
3408
W8
0029
Program 00 3406
29 2E40
TBLPAG
0000
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-251
dsPIC30F/33F Programmer’s Reference Manual
TBLRDL
Syntax:
Table Read Low
{label:}
TBLRDL{.B} [Ws],
Wd
[Ws++],
[Wd]
[Ws--],
[Wd++]
[++Ws],
[Wd--]
[--Ws],
[++Wd]
[--Wd]
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
If (LSB(Ws) = 1)
Program Mem [(TBLPAG),(Ws)] <15:8> → Wd
Else
Program Mem [(TBLPAG),(Ws)] <7:0> → Wd
For word operation:
Program Mem [(TBLPAG),(Ws)] <15:0> → Wd
Status Affected:
None
Encoding:
Description:
1011
1010
0Bqq
qddd
dppp
ssss
Read the contents of the least significant word of program memory and
store it to the destination register Wd. The target word address of program
memory is formed by concatenating the 8-bit Table Pointer register,
TBLPAG<7:0>, with the effective address specified by Ws. Indirect
addressing must be used for Ws, and either register direct or indirect
addressing may be used for Wd.
In Word mode, the lower 2 bytes of program memory are stored to the
destination register. In Byte mode, the source address depends on the
contents of Ws. If Ws is not word-aligned, the second byte of the program
memory word (PM<15:7>) is stored to the destination register. If Ws is
word-aligned, the first byte of the program memory word (PM<7:0>) is
stored to the destination register.
The ‘B’ bit selects byte or word operation (‘0’ for word mode, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
DS70157B-page 5-252
Words:
1
Cycles:
2
The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 1:
TBLRDL.B
W0
W1
Data 0F70
Program 01 0812
TBLPAG
SR
Example 2:
Before
Instruction
0813
0F71
0944
EF 2042
0001
0000
TBLRDL
W6
W8
Data 1202
Program 00 3406
TBLPAG
SR
[W0++], W1
; Read PM (TBLPAG:[W0]) (Byte mode)
; Store to W1
; Post-increment W0
After
Instruction
W0
0814
W1
0F20
Data 0F70
EF44
Program 01 0812
EF 2042
TBLPAG
0001
SR
0000
[W6], [W8++]
Before
Instruction
3406
1202
658B
29 2E40
0000
0000
; Read PM (TBLPAG:[W6]) (Word mode)
; Store to W8
; Post-increment W8
After
Instruction
W6
3408
W8
1204
Data 1202
2E40
Program 00 3406
29 2E40
TBLPAG
0000
SR
0000
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-253
dsPIC30F/33F Programmer’s Reference Manual
TBLWTH
Syntax:
Table Write High
{label:}
TBLWTH{.B} Ws,
[Wd]
[Ws],
[Wd++]
[Ws++],
[Wd--]
[Ws--],
[++Wd]
[++Ws],
[--Wd]
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
If (LSB(Wd) = 1)
NOP
Else
(Ws) → Program Mem [(TBLPAG),(Wd)]<23:16>
For word operation:
(Ws)<7:0> → Program Mem [(TBLPAG),(Wd)] <23:16>
Status Affected:
None
Encoding:
Description:
1011
1011
1Bqq
qddd
dppp
ssss
Store the contents of the working source register Ws to the most significant word of program memory. The destination word address of program
memory is formed by concatenating the 8-bit Table Pointer register,
TBLPAG<7:0>, with the effective address specified by Wd. Either direct or
indirect addressing may be used for Ws, and indirect addressing must be
used for Wd.
Since program memory is 24 bits wide, this instruction can only write to the
upper byte of program memory (PM<23:16>). This may be performed
using a Wd that is word-aligned in Byte mode or Word mode. If Byte mode
is used with a Wd that is not word-aligned, no operation is performed.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
DS70157B-page 5-254
Words:
1
Cycles:
2
The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a
word move, but it is not required.
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 1:
TBLWTH.B
W0
W1
Data 0812
Program 01 0F70
TBLPAG
SR
Before
Instruction
0812
0F70
0944
EF 2042
0001
0000
Note:
Example 2:
Note:
; Write [W0]... (Byte mode)
; to PM Latch High (TBLPAG:[W1])
; Post-increment W0
After
Instruction
W0
0812
W1
0F70
Data 0812
EF44
Program 01 0F70
44 2042
TBLPAG
0001
SR
0000
Only the Program Latch is written to. The contents of program memory
are not updated until the Flash memory is programmed using the
procedure described in the dsPIC30F Family Reference Manual
(DS70046).
TBLWTH
W6
W8
Program 00 0870
TBLPAG
SR
[W0++], [W1]
W6, [W8++]
Before
Instruction
0026
0870
22 3551
0000
0000
; Write W6... (Word mode)
; to PM Latch High (TBLPAG:[W8])
; Post-increment W8
After
Instruction
W6
0026
W8
0872
Program 00 0870
26 3551
TBLPAG
0000
SR
0000
Only the Program Latch is written to. The contents of program memory
are not updated until the Flash memory is programmed using the
procedure described in the dsPIC30F Family Reference Manual
(DS70046).
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-255
dsPIC30F/33F Programmer’s Reference Manual
TBLWTL
Syntax:
Table Write Low
{label:}
TBLWTL{.B} Ws,
[Wd]
[Ws],
[Wd++]
[Ws++],
[Wd--]
[Ws--],
[++Wd]
[++Ws],
[--Wd]
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
For byte operation:
If (LSB(Wd)=1)
(Ws) → Program Mem [(TBLPAG),(Wd)] <15:8>
Else
(Ws) → Program Mem [(TBLPAG),(Wd)] <7:0>
For word operation:
(Ws) → Program Mem [(TBLPAG),(Wd)] <15:0>
Status Affected:
None
Encoding:
Description:
1011
1011
0Bqq
qddd
dppp
ssss
Store the contents of the working source register Ws to the least significant
word of program memory. The destination word address of program
memory is formed by concatenating the 8-bit Table Pointer register,
TBLPAG<7:0>, with the effective address specified by Wd. Either direct or
indirect addressing may be used for Ws, and indirect addressing must be
used for Wd.
In Word mode, Ws is stored to the lower 2 bytes of program memory. In
Byte mode, the Least Significant bit of Wd determines the destination byte.
If Wd is not word-aligned, Ws is stored to the second byte of program
memory (PM<15:8>). If Wd is word-aligned, Ws is stored to the first byte of
program memory (PM<7:0>).
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
DS70157B-page 5-256
Words:
1
Cycles:
2
The extension .B in the instruction denotes a byte move rather
than a word move. You may use a .W extension to denote a word
move, but it is not required.
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 1:
TBLWTL.B
W0
W1
Program 00 1224
TBLPAG
SR
Before
Instruction
6628
1225
78 0080
0000
0000
Note:
Example 2:
Note:
; Write W0... (Byte mode)
; to PM Latch Low (TBLPAG:[W1])
; Post-increment W1
After
Instruction
W0
6628
W1
1226
Program 01 1224
78 2880
TBLPAG
0000
SR
0000
Only the Program Latch is written to. The contents of program memory
are not updated until the Flash memory is programmed using the
procedure described in the dsPIC30F Family Reference Manual
(DS70046).
TBLWTL
W6
W8
Data 1600
Program 01 7208
TBLPAG
SR
W0, [W1++]
[W6], [W8]
Before
Instruction
1600
7208
0130
09 0002
0001
0000
; Write [W6]... (Word mode)
; to PM Latch Low (TBLPAG:[W8])
; Post-increment W8
After
Instruction
W6
1600
W8
7208
Data 1600
0130
Program 01 7208
09 0130
TBLPAG
0001
SR
0000
Only the Program Latch is written to. The contents of program memory
are not updated until the Flash memory is programmed using the
procedure described in the dsPIC30F Family Reference Manual
(DS70046).
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-257
dsPIC30F/33F Programmer’s Reference Manual
ULNK
De-allocate Stack Frame
Syntax:
{label:}
Operands:
None
Operation:
W14 → W15
(W15) – 2 → W15
(TOS) → W14
Status Affected:
None
Encoding:
1111
1010
1000
0000
0000
0000
Description:
This instruction de-allocates a Stack Frame for a subroutine calling
sequence. The Stack Frame is de-allocated by setting the Stack
Pointer (W15) equal to the Frame Pointer (W14), and then POPping
the stack to reset the Frame Pointer (W14).
Words:
1
Cycles:
1
Example 1:
ULNK
; Unlink the stack frame
Before
Instruction
W14
2002
W15
20A2
Data 2000
2000
SR
0000
Example 2:
ULNK
After
Instruction
W14
2000
W15
2000
Data 2000
2000
SR
0000
; Unlink the stack frame
Before
Instruction
W14
0802
W15
0812
Data 0800
0800
SR
0000
DS70157B-page 5-258
ULNK
After
Instruction
W14
0800
W15
0800
Data 0800
0800
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
XOR
Exclusive OR f and WREG
Syntax:
{label:}
Operands:
f ∈ [0 ... 8191]
Operation:
(f).XOR.(WREG) → destination designated by D
Status Affected:
N, Z
Encoding:
XOR{.B}
1011
Description:
0110
f
{,WREG}
1BDf
ffff
ffff
ffff
Compute the logical exclusive OR operation of the contents of the
default working register WREG and the contents of the specified file
register and place the result in the destination register. The optional
WREG operand determines the destination register. If WREG is
specified, the result is stored in WREG. If WREG is not specified, the
result is stored in the file register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘D’ bit selects the destination (‘0’ for WREG, ‘1’ for file register).
The ‘f’ bits select the address of the file register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: The WREG is set to working register W0.
Words:
1
Cycles:
1
Example 1:
XOR.B
0x1FFF
Before
Instruction
WREG (W0)
7804
Data 1FFE
9439
SR
0000
Example 2:
XOR
; XOR (0x1FFF) and WREG (Byte mode)
; Store result to 0x1FFF
After
Instruction
WREG (W0)
7804
Data 1FFE
9039
SR
0008 (N = 1)
0xA04, WREG
Before
Instruction
WREG (W0)
6234
Data 0A04 A053
SR
0000
; XOR (0xA04) and WREG (Word mode)
; Store result to WREG
After
Instruction
WREG (W0) C267
Data 0A04 A053
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-259
dsPIC30F/33F Programmer’s Reference Manual
XOR
Exclusive OR Literal and Wn
Syntax:
{label:}
Operands:
lit10 ∈ [0 ... 255] for byte operation
lit10 ∈ [0 ... 1023] for word operation
Wn ∈ [W0 ... W15]
Operation:
lit10.XOR.(Wn) → Wn
Status Affected:
N, Z
Encoding:
XOR{.B}
1011
Description:
#lit10,
0010
1Bkk
Wn
kkkk
kkkk
dddd
Compute the logical exclusive OR operation of the unsigned 10-bit literal
operand and the contents of the working register Wn and store the result
back in the working register Wn. Register direct addressing must be
used for Wn.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘k’ bits specify the literal operand.
The ‘d’ bits select the address of the working register.
Note 1: The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
2: For byte operations, the literal must be specified as an
unsigned value [0:255]. See Section 4.6 “Using 10-bit Literal Operands” for information on using 10-bit literal
operands in Byte mode.
Words:
1
Cycles:
1
Example 1:
XOR.B
#0x23, W0
Before
Instruction
W0
7804
SR
0000
Example 2:
XOR
#0x108, W4
Before
Instruction
W4
6134
SR
0000
DS70157B-page 5-260
; XOR 0x23 and W0 (Byte mode)
; Store result to W0
After
Instruction
W0
7827
SR
0000
; XOR 0x108 and W4 (Word mode)
; Store result to W4
After
Instruction
W4 603C
SR
0000
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
XOR
Exclusive OR Wb and Short Literal
Syntax:
{label:}
XOR{.B}
Wb,
#lit5,
Wd
[Wd]
[Wd++]
[Wd--]
[++Wd]
[--Wd]
Wb ∈ [W0 ... W15]
lit5 ∈ [0 ... 31]
Wd ∈ [W0 ... W15]
Operands:
Operation:
(Wb).XOR.lit5 → Wd
Status Affected:
N, Z
Encoding:
0110
Description:
1www
wBqq
qddd
d11k
kkkk
Compute the logical exclusive OR operation of the contents of the base
register Wb and the unsigned 5-bit literal operand and place the result in
the destination register Wd. Register direct addressing must be used for
Wb. Either register direct or indirect addressing may be used for Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘k’ bits provide the literal operand, a 5-bit integer number.
Note:
Words:
1
Cycles:
1
Example 1:
XOR.B
W4, #0x16, W5
Before
Instruction
W4
C822
W5
1200
SR
0000
Example 2:
XOR
; XOR W4 and 0x14 (Byte mode)
; Store result to W5
After
Instruction
W4
C822
W5
1234
SR
0000
W2, #0x1F, [W8++]
; XOR W2 by 0x1F (Word mode)
; Store result to [W8]
; Post-increment W8
After
Instruction
W2
8505
W8
1006
Data 1004
851A
SR
0008 (N = 1)
Preliminary
5
Instruction
Descriptions
Before
Instruction
W2
8505
W8
1004
Data 1004
6628
SR
0000
© 2005 Microchip Technology Inc.
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
DS70157B-page 5-261
dsPIC30F/33F Programmer’s Reference Manual
XOR
Syntax:
Exclusive OR Wb and Ws
{label:}
XOR{.B}
Operands:
Wb ∈ [W0 ... W15]
Ws ∈ [W0 ... W15]
Wd ∈ [W0 ... W15]
Operation:
(Wb).XOR.(Ws) → Wd
Status Affected:
N, Z
Encoding:
Description:
0110
Wb,
1www
wBqq
Ws,
Wd
[Ws],
[Wd]
[Ws++],
[Wd++]
[Ws--],
[Wd--]
[++Ws],
[++Wd]
[--Ws],
[--Wd]
qddd
dppp
ssss
Compute the logical exclusive OR operation of the contents of the
source register Ws and the contents of the base register Wb, and place
the result in the destination register Wd. Register direct addressing must
be used for Wb. Either register direct or indirect addressing may be used
for Ws and Wd.
The ‘w’ bits select the address of the base register.
The ‘B’ bit selects byte or word operation (‘0’ for word, ‘1’ for byte).
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note:
Words:
1
Cycles:
1
Example 1:
XOR.B
W1, [W5++], [W9++]
Before
Instruction
W1 AAAA
W5
2000
W9
2600
Data 2000
115A
Data 2600
0000
SR
0000
DS70157B-page 5-262
The extension .B in the instruction denotes a byte operation
rather than a word operation. You may use a .W extension to
denote a word operation, but it is not required.
; XOR W1 and [W5] (Byte mode)
; Store result to [W9]
; Post-increment W5 and W9
After
Instruction
W1 AAAA
W5
2001
W9
2601
Data 2000
115A
Data 2600
00F0
SR
0008 (N = 1)
Preliminary
© 2005 Microchip Technology Inc.
Section 5. Instruction Descriptions
Example 2:
XOR
W1, W5, W9
Before
Instruction
W1 FEDC
W5
1234
W9
A34D
SR
0000
; XOR W1 and W5 (Word mode)
; Store the result to W9
After
Instruction
W1 FEDC
W5
1234
W9
ECE8
SR
0008 (N = 1)
5
Instruction
Descriptions
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 5-263
dsPIC30F/33F Programmer’s Reference Manual
ZE
Zero-Extend Wn
Syntax:
{label:}
ZE
Ws,
Wnd
[Ws],
[Ws++],
[Ws--],
[++Ws],
[--Ws],
Operands:
Ws ∈ [W0 ... W15]
Wnd ∈ [W0 ... W15]
Operation:
Ws<7:0> → Wnd<7:0>
0 → Wnd<15:8>
Status Affected:
N, Z, C
Encoding:
1111
Description:
1011
10qq
qddd
dppp
ssss
Zero-extend the Least Significant Byte in source working register Ws to
a 16-bit value and store the result in the destination working register
Wnd. Either register direct or indirect addressing may be used for Ws,
and register direct addressing must be used for Wnd. The N flag is
cleared and the C flag is set, because the zero-extended word is always
positive.
The ‘q’ bits select the destination Address mode.
The ‘d’ bits select the destination register.
The ‘p’ bits select the source Address mode.
The ‘s’ bits select the source register.
Note 1: This operation converts a byte to a word, and it uses no .B or
.W extension.
2: The source Ws is addressed as a byte operand, so any
address modification is by ‘1’.
Words:
1
Cycles:
1
Example 1:
ZE
W3, W4
; zero-extend W3
; Store result to W4
Before
Instruction
W3
7839
W4
1005
SR
0000
Example 2:
ZE
[W2++], W12
Before
Instruction
W2
0900
W12
1002
Data 0900
268F
SR
0000
DS70157B-page 5-264
After
Instruction
W3
7839
W4
0039
SR
0001 (C = 1)
; Zero-extend [W2]
; Store to W12
; Post-increment W2
After
Instruction
W2
0901
W12
008F
Data 0900
268F
SR
0001 (C = 1)
Preliminary
© 2005 Microchip Technology Inc.
6
Reference
Section 6. Reference
HIGHLIGHTS
This section of the manual contains reference information for the dsPIC30F and dsPIC33F architectures. It consists of the following sections:
6.1
6.2
6.3
6.4
6.5
Data Memory Map ......................................................................................................... 6-2
Core Special Function Register Map ............................................................................. 6-4
Program Memory Map ................................................................................................... 6-7
Instruction Bit Map ......................................................................................................... 6-9
Instruction Set Summary Table .................................................................................... 6-11
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 6-1
dsPIC30F/33F Programmer’s Reference Manual
6.1
Data Memory Map
Sample dsPIC30F and dsPIC33F data memory maps are shown in Figure 6-1 and Figure 6-2,
respectively.
Figure 6-1:
dsPIC30F Data Memory Map Example
MSB
Address
MSB
0x0001
LSB
Address
16-bits
LSB
SFR Space
0x07FE
0x0800
0x07FF
0x0801
Near
RAM
0x0000
X Data RAM
0x17FF
0x1801
0x1FFF
0x17FE
0x1800
Y Data RAM
0x27FF
0x2801
0x27FE
0x2800
0x8001
0x8000
X Data RAM
Unimplemented
Provides Program
Space Visibility
0xFFFF
0xFFFE
Note 1: The partition between the X and Y data spaces is device-specific. Refer to the
appropriate device data sheet for further details. The data space boundaries
indicated here are for example purposes only.
2: Refer to Section 4. “Instruction Set Details” for information on Data Addressing
modes, performing byte accesses and word alignment requirements.
3: Refer to the dsPIC30F Family Reference Manual (DS70046) for information on
accessing program memory through data address space.
DS70157B-page 6-2
Preliminary
© 2005 Microchip Technology Inc.
Section 6. Reference
6
Figure 6-2:
dsPIC33F Data Memory Map Example
2 Kbyte
SFR Space
LSB
Address
16-bits
MSB
0x0001
LSB
SFR Space
0x0000
0x07FE
0x0800
0x07FF
0x0801
X Data RAM (X)
30 Kbyte
SRAM space
Reference
MSB
Add ress
0x47FF
0x4801
8 Kbyte
Near
Data
Space
0x47FE
0x4800
Y Data RAM (Y)
0x77FF
0x7800
0x7FFF
0x8001
DMA RAM
0x77FE
0x7800
0x7FFE
0x8000
X Data
Unimplemented (X)
Optionally
Mapped
into Program
Memory
0xFFFF
0xFFFE
Note 1: The partition between the X and Y data spaces is device-specific. Refer to the
appropriate device data sheet for further details. The data space boundaries
indicated here are for example purposes only.
2: Refer to Section 4. “Instruction Set Details” for information on Data Addressing
modes, performing byte accesses and word alignment requirements.
3: Refer to the dsPIC30F Family Reference Manual (DS70046) for information on
accessing program memory through data address space.
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 6-3
dsPIC30F/33F Programmer’s Reference Manual
6.2
Core Special Function Register Map
The Core Special Function Register Map is shown in Table 6-1. Please refer to the
dsPIC30F/dsPIC33F Data Sheet for complete register descriptions and the memory map of the
remaining special function registers.
DS70157B-page 6-4
Preliminary
© 2005 Microchip Technology Inc.
Name
dsPIC30F/dsPIC33F Core Register Map
Addr
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset State
Preliminary
W0
0000
W0 (WREG)
W1
0002
W1
0000 0000 0000 0000
W2
0004
W2
0000 0000 0000 0000
W3
0006
W3
0000 0000 0000 0000
W4
0008
W4
0000 0000 0000 0000
W5
000A
W5
0000 0000 0000 0000
W6
000C
W6
0000 0000 0000 0000
W7
000E
W7
0000 0000 0000 0000
W8
0010
W8
0000 0000 0000 0000
W9
0012
W9
0000 0000 0000 0000
W10
0014
W10
0000 0000 0000 0000
W11
0016
W11
0000 0000 0000 0000
W12
0018
W12
0000 0000 0000 0000
001A
W13
0000 0000 0000 0000
W14
001C
W14
0000 0000 0000 0000
W15
001E
W15
0000 1000 0000 0000
SPLIM
0020
SPLIM
0000 0000 0000 0000
ACCAL
0022
ACCAL
0000 0000 0000 0000
ACCAH
0024
ACCAH
ACCAU
0026
ACCBL
0028
ACCBH
002A
W13
002C
PCL
002E
0000 0000 0000 0000
Sign-extension of ACCA<39>
ACCAU
0000 0000 0000 0000
ACCBL
0000 0000 0000 0000
ACCBH
0000 0000 0000 0000
Sign-extension of ACCB<39>
ACCBU
0000 0000 0000 0000
PCL
0000 0000 0000 0000
PCH
0030
—
—
—
—
—
—
—
—
TBLPAG
0032
—
—
—
—
—
—
—
—
TBLPAG
0000 0000 0000 0000
PSVPAG
0034
—
—
—
—
—
—
—
—
PSVPAG
0000 0000 0000 0000
DS70157B-page 6-5
RCOUNT
0036
RCOUNT
DCOUNT
0038
DCOUNT
DOSTARTL
003A
DOSTARTH
003C
—
PCH
0000 0000 0000 0000
DOSTARTL
—
—
—
—
—
—
—
—
Section 6. Reference
ACCBU
0000 0000 0000 0000
xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
—
—
DOSTARTH
DOENDH
0000 0000 00xx xxxx
DOENDL
DOENDL
003E
DOENDH
0040
—
—
—
—
—
—
—
—
—
—
SR
0042
OA
OB
SA
SB
OAB
SAB
DA
DC
IPL2
IPL1
xxxx xxxx xxxx xxxx
IPL0
RA
N
0000 0000 00xx xxxx
OV
Z
C
0000 0000 0000 0000
6
Reference
© 2005 Microchip Technology Inc.
Table 6-1:
Name
dsPIC30F/dsPIC33F Core Register Map (Continued)
Addr
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset State
—
—
US
EDT
DL2
DL1
DL0
SATA
SATB
SATDW
ACCSAT
IPL3
PSV
RND
IF
0000 0000 0010 0000
YMODEN
—
—
CORCON
0044
—
MODCON
0046
XMODEN
XMODSRT
0048
XMODSRT<15:0>
xxxx xxxx xxxx xxxx
XMODEND
004A
XMODEND<15:0>
xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
BWM<3:0>
YWM<3:0>
YMODSRT
004C
YMODSRT<15:0>
YMODEND
004E
YMODEND<15:0>
XBREV
0050
BREN
DISICNT
0052
—
—
0054-007E
—
—
Reserved
XWM<3:0>
0000 0000 0000 0000
xxxx xxxx xxxx xxxx
XBREV<14:0>
xxxx xxxx xxxx xxxx
DISICNT<13:0>
—
—
—
—
—
—
—
—
0000 0000 0000 0000
—
—
—
—
—
—
0000 0000 0000 0000
Preliminary
© 2005 Microchip Technology Inc.
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-6
Table 6-1:
Section 6. Reference
6
6.3
Program Memory Map
Figure 6-3:
dsPIC30F Program Space Memory Map Example
User Memory
Space
Reset – GOTO Instruction
Reset – Target Address
Osc. Fail Trap Vector
Stack Error Trap Vector
Address Error Trap Vector
Math Error Trap Vector
Software Trap
Reserved Vector
Reserved Vector
Reserved Vector
Interrupt 0 Vector
Interrupt 1 Vector
Interrupt 52 Vector
Interrupt 53 Vector
Alternate Vector Table
000000
000002
000004
000014
Vector Tables
00007E
000080
0000FE
000100
User Flash
Program Memory
(48K instructions)
Reserved
(Read ‘0’s)
Data Flash
(4 Kbytes)
017FFE
018000
7FEFFE
7FF000
7FFFFE
800000
Reserved
UNITID
8005BE
8005C0
Configuration Memory
Space
8005FE
800600
Reserved
Fuse Configuration
Registers
F7FFFE
F80000
F8000E
F80010
Reserved
DEVID
© 2005 Microchip Technology Inc.
Preliminary
FEFFFE
FF0000
FFFFFE
DS70157B-page 6-7
Reference
Sample dsPIC30F and dsPIC33F program memory maps are shown in Figure 6-3 and
Figure 6-4, respectively.
dsPIC30F/33F Programmer’s Reference Manual
dsPIC33F Program Space Memory Map Example
Reset – GOTO Instruction
Reset – Target Address
Reserved
Osc. Fail Trap Vector
Address Error Trap Vector
Stack Error Trap Vector
Math Error Trap Vector
DMA Error Vector
Reserved Vector
Reserved Vector
000000
000002
000004
000014
Vector
Tables
Figure 6-4:
User Memory
Space
Interrupt Vector Table
Reserved
0000FE
000100
000104
Alternate Vector Table
0001FE
000200
User Flash
Program Memory
(87296 x 24-bit)
02ABFE
02AC00
Reserved
7FFFFE
800000
Configuration Memory
Space
Reserved
Device Configuration
Registers (12 x 8-bit)
F7FFFE
F80000
F80016
F80018
Reserved
Device ID (2 x 16-bit)
Reserved
FEFFFE
FF0000
FF0002
FF0004
FFFFFE
DS70157B-page 6-8
Preliminary
© 2005 Microchip Technology Inc.
Section 6. Reference
6
6.4
Instruction Bit Map
Note:
© 2005 Microchip Technology Inc.
The complete opcode for each instruction may be determined by the instruction
descriptions in Section 5. “Instruction Descriptions”, using Table 5.2 through
Table 5-12.
Preliminary
DS70157B-page 6-9
Reference
Instruction encoding for the dsPIC30F/33F is summarized in Table 6-2. This table contains the
encoding for the Most Significant Byte of each instruction. The first column in the table represents
bits 23:20 of the opcode, and the first row of the table represents bits 19:16 of the opcode. The
first byte of the opcode is formed by taking the first column bit value and appending the first row
bit value. For instance, the Most Significant Byte of the PUSH instruction (last row, ninth column)
is encoded with 11111000b (0xF8).
dsPIC30F/dsPIC33F Instruction Encoding
Opcode<19:16>
0000
0000
NOP
0001
BRA
CALL
GOTO
RCALL
0010
0011
CALL
—
0001
0100
GOTO
0101
RETLW
0110
RETFIE
RETURN
0111
RCALL
Preliminary
Opcode<23:20>
DO
1001
1010
1011
1100
1101
1110
1111
REPEAT
—
—
BRA
(OA)
BRA
(OB)
BRA
(SA)
BRA
(SB)
BRA
(GT)
BRA
(GE)
BRA
(GTU)
—
SUBR
SUBBR
0010
0011
1000
MOV
BRA
(OV)
BRA
(C)
BRA
(Z)
BRA
(N)
BRA
(LE)
BRA
(LT)
BRA
(LEU)
BRA
BRA (NOV)
BRA
(NC)
BRA
(NZ)
BRA
(NN)
0100
ADD
ADDC
0101
SUB
SUBB
0110
AND
XOR
0111
IOR
MOV
1000
MOV
1001
MOV
1010
BSET
BCLR
BTG
BTST
BTSTS
BTST
BTSS
BTSC
BSET
BCLR
BTG
BTST
BTSTS
BSW
BTSS
BTSC
1011
ADD
ADDC
SUB
SUBB
AND
XOR
IOR
MOV
ADD
ADDC
SUB
SUBB
AND
XOR
IOR
MOV
MUL.US
MUL.UU
MUL.SS
MUL.SU
TBLRDH
TBLRDL
TBLWTH
TBLWTL
MUL
SUB
SUBB
MOV.D
MOV
MOVSAC
SFTAC
ADD
LAC
ADD
NEG
SUB
SAC
SAC.R
—
FF1L
FF1R
1100
MAC
MPY
MPY.N
MSC
CLRAC
MAC
MPY
MPY.N
MSC
© 2005 Microchip Technology Inc.
1101
SL
ASR
LSR
RLC
RLNC
RRC
RRNC
SL
ASR
LSR
RLC
RLNC
RRC
RRNC
DIV.S
DIV.U
DIVF
—
—
—
SL
ASR
LSR
FBCL
1110
CP0
CP
CPB
CP0
CP
CPB
—
—
CPSGT
CPSLT
CPSEQ
CPSNE
INC
INC2
DEC
DEC2
COM
NEG
CLR
SETM
INC
INC2
DEC
DEC2
COM
NEG
CLR
SETM
—
—
—
—
PUSH
POP
LNK
ULNK
SE
ZE
DISI
DAW
EXCH
SWAP
CLRWDT
PWRSAV
POP.S
PUSH.S
RESET
NOPR
1111
ED
EDAC
MAC
MPY
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-10
Table 6-2:
Section 6. Reference
6
6.5
Instruction Set Summary Table
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 6-11
Reference
The complete dsPIC30F/33F instruction set is summarized in Table 6-3. This table contains an
alphabetized listing of the instruction set. It includes instruction assembly syntax, description,
size (in 24-bit words), execution time (in instruction cycles), affected status bits and the page
number in which the detailed description can be found. Table 1-2 identifies the symbols which
are used in the Instruction Set Summary Table.
dsPIC30F/dsPIC33F Instruction Set Summary Table
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
5-7
ADD
f {,WREG}
Destination = f + WREG
1
1
—
—
—
—
—
—
ADD
#lit10,Wn
Wn = lit10 + Wn
1
1
—
—
—
—
—
—
ADD
Wb,#lit5,Wd
Wd = Wb + lit5
1
1
—
—
—
—
—
—
ADD
Wb,Ws,Wd
Wd = Wb + Ws
1
1
—
—
—
—
—
—
5-8
5-9
5-10
Preliminary
ADD
Acc
Add accumulators
1
1
!
!
"
"
—
5-11
1
"
"
—
1
"
"
—
16-bit signed add to accumulator
!
!
—
Ws,#Slit4,Acc
!
!
—
ADD
—
—
—
—
—
5-12
ADDC
f {,WREG}
Destination = f + WREG + (C)
1
1
—
—
—
—
—
—
#lit10,Wn
Wn = lit10 + Wn + (C)
1
1
—
—
—
—
—
—
ADDC
Wb,#lit5,Wd
Wd = Wb + lit5 + (C)
1
1
—
—
—
—
—
—
ADDC
Wb,Ws,Wd
Wd = Wb + Ws + (C)
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
AND
f {,WREG}
Destination = f .AND. WREG
1
1
—
—
—
—
—
—
—
—
5-19
AND
#lit10,Wn
Wn = lit10 .AND. Wn
1
1
—
—
—
—
—
—
—
—
5-20
AND
Wb,#lit5,Wd
Wd = Wb .AND. lit5
1
1
—
—
—
—
—
—
—
—
5-21
AND
Wb,Ws,Wd
Wd = Wb .AND. Ws
1
1
—
—
—
—
—
—
—
—
5-22
ASR
f {,WREG}
Destination = arithmetic right shift f
1
1
—
—
—
—
—
—
—
Ws,Wd
Wd = arithmetic right shift Ws
1
1
—
—
—
—
—
—
—
!
!
5-24
ASR
—
5-27
—
#
#
#
#
!
!
!
!
!
!
!
!
5-14
ADDC
!
!
!
!
ASR
Wb,#lit4,Wnd
Wnd = arithmetic right shift Wb by lit4
1
1
—
—
—
—
—
—
—
ASR
Wb,Wns,Wnd
Wnd = arithmetic right shift Wb by Wns
1
1
—
—
—
—
—
—
—
!
!
!
!
!
!
!
!
!
!
!
!
BCLR
f,#bit4
Bit clear f
1
1
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
5-15
5-16
5-17
5-25
—
5-28
—
—
5-29
BCLR
Ws,#bit4
Bit clear Ws
1
1
—
—
—
—
—
—
—
—
—
—
—
5-30
BRA
Expr
Branch unconditionally
1
2
—
—
—
—
—
—
—
—
—
—
—
5-31
BRA
Wn
Computed branch
1
2
—
—
—
—
—
—
—
—
—
—
—
5-32
BRA
C,Expr
Branch if Carry
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-33
© 2005 Microchip Technology Inc.
BRA
GE,Expr
Branch if greater than or equal
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-35
BRA
GEU,Expr
Branch if Carry
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-36
BRA
GT,Expr
Branch if greater than
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-37
BRA
GTU,Expr
Branch if unsigned greater than
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-38
BRA
LE,Expr
Branch if less than or equal
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-39
BRA
LEU,Expr
Branch if unsigned less than or equal
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-40
BRA
LT,Expr
Branch if less than
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-41
BRA
LTU,Expr
Branch if not Carry
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-42
BRA
N,Expr
Branch if Negative
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-43
BRA
NC,Expr
Branch if not Carry
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-44
BRA
NN,Expr
Branch if not Negative
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-45
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
— unchanged
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-12
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
BRA
NOV,Expr
Branch if not Overflow
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-46
BRA
NZ,Expr
Branch if not Zero
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-47
BRA
OA,Expr
Branch if Accumulator A overflow
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-48
BRA
OB,Expr
Branch if Accumulator B overflow
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-49
BRA
OV,Expr
Branch if Overflow
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-50
BRA
SA,Expr
Branch if Accumulator A saturated
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-51
BRA
SB,Expr
Branch if Accumulator B saturated
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-52
BRA
Z,Expr
Branch if Zero
1
1 (2)
—
—
—
—
—
—
—
—
—
—
—
5-53
BSET
f,#bit4
Bit set f
1
1
—
—
—
—
—
—
—
—
—
—
—
5-54
BSET
Ws,#bit4
Bit set Ws
1
1
—
—
—
—
—
—
—
—
—
—
—
5-55
BSW.C
Ws,Wb
Write C bit to Ws<Wb>
1
1
—
—
—
—
—
—
—
—
—
—
—
5-56
BSW.Z
Ws,Wb
Write Z bit to Ws<Wb>
1
1
—
—
—
—
—
—
—
—
—
—
—
5-56
BTG
f,#bit4
Bit toggle f
1
1
—
—
—
—
—
—
—
—
—
—
—
5-58
BTG
Ws,#bit4
Bit toggle Ws
1
1
—
—
—
—
—
—
—
—
—
—
—
5-59
BTSC
f,#bit4
Bit test f, skip if clear
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-60
Preliminary
BTSC
Ws,#bit4
Bit test Ws, skip if clear
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-62
BTSS
f,#bit4
Bit test f, skip if set
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-64
Ws,#bit4
Bit test Ws, skip if set
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-65
BTST
f,#bit4
Bit test f
1
1
—
—
—
—
—
—
—
—
—
!
—
5-67
BTST.C
Ws,#bit4
Bit test Ws to C
1
1
—
—
—
—
—
—
—
—
—
—
!
5-68
BTST.Z
Ws,#bit4
Bit test Ws to Z
1
1
—
—
—
—
—
—
—
—
—
!
—
5-68
BTST.C
Ws,Wb
Bit test Ws<Wb> to C
1
1
—
—
—
—
—
—
—
—
—
—
!
5-69
BTST.Z
Ws,Wb
Bit test Ws<Wb> to Z
1
1
—
—
—
—
—
—
—
—
—
—
5-69
BTSTS
f,#bit4
Bit test then set f
1
1
—
—
—
—
—
—
—
—
—
!
!
—
5-71
BTSTS.C
Ws,#bit4
Bit test Ws to C then set
1
1
—
—
—
—
—
—
—
—
—
—
!
5-72
DS70157B-page 6-13
BTSTS.Z
Ws,#bit4
Bit test Ws to Z then set
1
1
—
—
—
—
—
—
—
—
—
!
—
5-72
CALL
Expr
Call subroutine
2
2
—
—
—
—
—
—
—
—
—
—
—
5-73
CALL
Wn
Call indirect subroutine
1
2
—
—
—
—
—
—
—
—
—
—
—
5-74
CLR
f
f = 0x0000
1
1
—
—
—
—
—
—
—
—
—
—
—
5-75
CLR
WREG
WREG = 0x0000
1
1
—
—
—
—
—
—
—
—
—
—
—
5-75
CLR
Wd
Wd = 0
1
1
—
—
—
—
—
—
—
—
—
—
—
5-76
CLR
Acc,Wx,Wxd,Wy,Wyd,AWB
Clear accumulator
1
1
0
0
0
0
0
0
—
—
—
—
—
5-77
CLRWDT
Clear Watchdog Timer
1
1
—
—
—
—
—
—
—
—
—
—
—
5-79
COM
f {,WREG}
Destination = f
1
1
—
—
—
—
—
—
—
—
5-80
Ws,Wd
Wd = Ws
1
1
—
—
—
—
—
—
—
!
!
—
COM
!
!
—
5-81
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
—
Section 6. Reference
BTSS
— unchanged
6
Reference
© 2005 Microchip Technology Inc.
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
!
!
!
!
!
!
!
!
!
!
!
!
!
#
#
#
!
!
!
5-82
1
5-85
1
5-86
!
!
!
5-87
CP
f
Compare (f – WREG)
1
1
—
—
—
—
—
—
CP
Wb,#lit5
Compare (Wb – lit5)
1
1
—
—
—
—
—
—
CP
Wb,Ws
Compare (Wb – Ws)
1
1
—
—
—
—
—
—
!
!
!
CP0
f
Compare (f – 0x0000)
1
1
—
—
—
—
—
—
1
CP0
Ws
Compare (Ws – 0x0000)
1
1
—
—
—
—
—
—
1
CPB
f
Compare with borrow (f – WREG – C)
1
1
—
—
—
—
—
—
CPB
Wb,#lit5
Compare with borrow (Wb – lit5 – C)
1
1
—
—
—
—
—
—
CPB
Wb,Ws
Compare with borrow (Wb – Ws – C)
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
!
!
!
CPSEQ
Wb, Wn
Compare (Wb with Wn), skip if =
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-91
CPSGT
Wb, Wn
Signed Compare (Wb with Wn), skip if >
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-92
CPSLT
Wb, Wn
Signed Compare (Wb with Wn), skip if <
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-93
CPSNE
Wb, Wn
Signed Compare (Wb with Wn), skip if ≠
1
1 (2 or 3)
—
—
—
—
—
—
—
—
—
—
—
5-94
5-83
5-84
5-88
5-89
Preliminary
DAW.B
Wn
Wn = decimal adjust Wn
1
1
—
—
—
—
—
—
—
—
—
—
f {,WREG}
Destination = f – 1
1
1
—
—
—
—
—
—
DEC
Ws,Wd
Wd = Ws – 1
1
1
—
—
—
—
—
—
DEC2
f {,WREG}
Destination = f – 2
1
1
—
—
—
—
—
—
DEC2
Ws,Wd
Wd = Ws – 2
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
5-95
DEC
DISI
#lit14
Disable interrupts for lit14 instruction cycles
1
1
—
—
—
—
—
—
—
—
—
—
—
5-100
!
!
!
!
!
5-101
5-96
5-97
5-98
5-99
© 2005 Microchip Technology Inc.
DIV.S
Wm, Wn
Signed 16/16-bit integer divide
1
18
—
—
—
—
—
—
—
DIV.SD
Wm, Wn
Signed 32/16-bit integer divide
1
18
—
—
—
—
—
—
—
!
!
!
!
DIV.U
Wm, Wn
Unsigned 16/16-bit integer divide
1
18
—
—
—
—
—
—
—
0
0
DIV.UD
Wm, Wn
Unsigned 32/16-bit integer divide
1
18
—
—
—
—
—
—
—
0
DIVF
Wm, Wn
Signed 16/16-bit fractional divide
1
18
—
—
—
—
—
—
—
!
!
!
!
!
!
!
!
DO
#lit14, Expr
Do code to PC + Expr, (lit14 + 1) times
2
2
—
—
—
—
—
—
—
—
—
—
—
5-107
DO
Wn, Expr
Do code to PC + Expr, (Wn + 1) times
2
2
—
—
—
—
—
—
—
—
—
—
—
5-109
ED
Wm*Wm,Acc,Wx,Wy,Wxd
Euclidean distance (no accumulate)
1
1
"
"
—
5-111
1
!
!
—
1
"
"
—
Euclidean distance
"
"
—
Wm*Wm,Acc,Wx,Wy,Wxd
!
!
—
EDAC
!
!
—
—
—
—
—
5-113
EXCH
Wns,Wnd
Swap Wns and Wnd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-115
FBCL
Ws,Wnd
Find bit change from left (MSb) side
1
1
—
—
—
—
—
—
—
—
—
—
Ws,Wnd
Find first one from left (MSb) side
1
1
—
—
—
—
—
—
—
—
—
—
FF1R
Ws,Wnd
Find first one from right (LSb) side
1
1
—
—
—
—
—
—
—
—
—
—
!
!
!
5-116
FF1L
GOTO
Expr
Go to address
2
2
—
—
—
—
—
—
—
—
—
—
—
5-122
Wn
Go to address indirectly
1
2
—
—
—
—
—
—
—
—
—
—
—
5-123
GOTO
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
— unchanged
5-101
5-103
5-103
5-105
5-118
5-120
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-14
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
!
!
!
!
!
!
!
!
5-124
—
5-128
—
5-129
—
5-130
—
!
!
!
!
!
!
!
!
—
5-131
—
—
5-133
Preliminary
f {,WREG}
Destination = f + 1
1
1
—
—
—
—
—
—
INC
Ws,Wd
Wd = Ws + 1
1
1
—
—
—
—
—
—
INC2
f {,WREG}
Destination = f + 2
1
1
—
—
—
—
—
—
INC2
Ws,Wd
Wd = Ws + 2
1
1
—
—
—
—
—
—
!
!
!
!
IOR
f {,WREG}
Destination = f .IOR. WREG
1
1
—
—
—
—
—
—
—
IOR
#lit10,Wn
Wn = lit10 .IOR. Wn
1
1
—
—
—
—
—
—
—
IOR
Wb,#lit5,Wd
Wd = Wb .IOR. lit5
1
1
—
—
—
—
—
—
—
IOR
Wb,Ws,Wd
Wd = Wb .IOR. Ws
1
1
—
—
—
—
—
—
—
!
!
!
!
!
!
!
!
LAC
Ws,#Slit4, Acc
Load accumulator
1
1
!
!
"
"
!
"
—
—
—
LNK
#lit14
Link Frame Pointer
1
1
—
—
—
—
—
—
—
—
—
—
—
5-135
LSR
f {,WREG}
Destination = logical right shift f
1
1
—
—
—
—
—
—
—
0
—
Ws,Wd
Wd = logical right shift Ws
1
1
—
—
—
—
—
—
—
0
—
!
!
5-136
LSR
LSR
Wb,#lit4,Wnd
Wnd = logical right shift Wb by lit4
1
1
—
—
—
—
—
—
—
—
—
5-139
—
!
!
!
!
—
5-140
—
—
—
5-141
INC
—
—
—
5-125
5-126
5-127
5-137
Wb,Wns,Wnd
Wnd = logical right shift Wb by Wns
1
1
—
—
—
—
—
—
—
MAC
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd,AWB
Multiply and accumulate
1
1
Wm*Wm,Acc,Wx,Wxd,Wy,Wyd,
Square and accumulate
1
1
!
!
"
"
"
"
!
!
"
"
—
MAC
!
!
—
—
—
—
—
—
5-143
MOV
f {,WREG}
Move f to destination
1
1
—
—
—
—
—
—
—
!
—
!
—
5-145
MOV
WREG,f
Move WREG to f
1
1
—
—
—
—
—
—
—
—
—
—
—
5-146
MOV
f,Wnd
Move f to Wnd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-147
MOV
Wns,f
Move Wns to f
1
1
—
—
—
—
—
—
—
—
—
—
—
5-148
MOV.B
#lit8,Wnd
Move 8-bit unsigned literal to Wnd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-149
MOV
#lit16,Wnd
Move 16-bit literal to Wnd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-150
MOV
[Ws+Slit10],Wnd
Move [Ws + Slit10] to Wnd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-151
DS70157B-page 6-15
MOV
Wns,[Wd+Slit10]
Move Wns to [Wd + Slit10]
1
1
—
—
—
—
—
—
—
—
—
—
—
5-152
MOV
Ws,Wd
Move Ws to Wd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-153
MOV.D
Wns,Wnd
Move double Wns to Wnd:Wnd + 1
1
2
—
—
—
—
—
—
—
—
—
—
—
5-155
MOV.D
Wns,Wnd
Move double Wns:Wns + 1 to Wnd
1
2
—
—
—
—
—
—
—
—
—
—
—
5-157
MOVSAC
Acc,Wx,Wxd,Wy,Wyd,AWB
Move [Wx] to Wxd, and [Wy] to Wyd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-159
MPY
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd
Multiply Wn by Wm to accumulator
1
1
!
!
"
"
"
"
!
!
"
"
—
—
—
—
—
5-161
MPY
Wm*Wm,Acc,Wx,Wxd,Wy,Wyd
Square to accumulator
1
1
!
!
—
—
—
—
—
5-163
MPY.N
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd
-(Multiply Wn by Wm) to accumulator
1
1
0
0
—
—
0
—
—
—
—
—
—
5-165
MSC
Wm*Wn,Acc,Wx,Wxd,Wy,Wyd,AWB
Multiply and subtract from accumulator
1
1
!
!
"
"
!
"
—
—
—
—
—
5-167
MUL
f
W3:W2 = f * WREG
1
1
—
—
—
—
—
—
—
—
—
—
—
5-169
MUL.SS
Wb,Ws,Wnd
{Wnd + 1,Wnd} = sign(Wb) * sign(Ws)
1
1
—
—
—
—
—
—
—
—
—
—
—
5-170
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
Section 6. Reference
LSR
!
!
— unchanged
6
Reference
© 2005 Microchip Technology Inc.
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
5-172
MUL.SU
Wb,#lit5,Wnd
{Wnd + 1,Wnd} = sign(Wb) * unsign(lit5)
1
1
—
—
—
—
—
—
—
—
—
—
—
MUL.SU
Wb,Ws,Wnd
{Wnd + 1,Wnd} = sign(Wb) * unsign(Ws)
1
1
—
—
—
—
—
—
—
—
—
—
—
5-174
MUL.US
Wb,Ws,Wnd
{Wnd + 1,Wnd} = unsign(Wb) * sign(Ws)
1
1
—
—
—
—
—
—
—
—
—
—
—
5-176
MUL.UU
Wb,#lit5,Wnd
{Wnd + 1,Wnd} = unsign(Wb) * unsign(lit5)
1
1
—
—
—
—
—
—
—
—
—
—
—
5-178
MUL.UU
Wb,Ws,Wnd
{Wnd + 1,Wnd} = unsign(Wb) * unsign(Ws)
1
1
—
—
—
—
—
—
—
—
—
—
—
5-179
NEG
f {,WREG}
Destination = f + 1
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
5-181
NEG
Ws,Wd
Wd = Ws + 1
1
1
—
—
—
—
—
—
!
!
NEG
Acc
Negate accumulator
1
1
!
!
"
"
!
"
—
—
—
—
—
5-183
NOP
No operation
1
1
—
—
—
—
—
—
—
—
—
—
—
5-184
NOPR
No operation
1
1
—
—
—
—
—
—
—
—
—
—
—
5-185
5-182
POP
f
POP TOS to f
1
1
—
—
—
—
—
—
—
—
—
—
—
5-186
POP
Wd
POP TOS to Wd
1
1
—
—
—
—
—
—
—
—
—
—
—
5-187
POP.D
Wnd
POP.S
Preliminary
POP double from TOS to Wnd:Wnd + 1
1
2
—
—
—
—
—
—
—
—
—
—
—
5-188
POP shadow registers
1
1
—
—
—
—
—
—
!
!
!
!
!
5-189
5-190
PUSH
f
PUSH f to TOS
1
1
—
—
—
—
—
—
—
—
—
—
—
PUSH
Ws
PUSH Ws to TOS
1
1
—
—
—
—
—
—
—
—
—
—
—
5-191
PUSH.D
Wns
PUSH double Wns:Wns + 1 to TOS
1
2
—
—
—
—
—
—
—
—
—
—
—
5-192
5-193
PUSH.S
PUSH shadow registers
1
1
—
—
—
—
—
—
—
—
—
—
—
PWRSAV
#lit1
Enter Power-saving mode
1
1
—
—
—
—
—
—
—
—
—
—
—
5-194
RCALL
Expr
Relative call
1
2
—
—
—
—
—
—
—
—
—
—
—
5-195
5-196
RCALL
Wn
Computed call
1
2
—
—
—
—
—
—
—
—
—
—
—
REPEAT
#lit14
Repeat next instruction (lit14 + 1) times
1
1
—
—
—
—
—
—
—
—
—
—
—
5-197
REPEAT
Wn
Repeat next instruction (Wn + 1) times
1
1
—
—
—
—
—
—
—
—
—
—
—
5-198
RESET
Software device Reset
1
1
—
—
—
—
—
—
—
—
—
—
—
5-200
RETFIE
Return from interrupt enable
1
3 (2)
—
—
—
—
—
—
—
!
!
!
!
5-201
Return with lit10 in Wn
1
3 (2)
—
—
—
—
—
—
—
—
—
—
—
5-202
RETLW
#lit10,Wn
RETURN
© 2005 Microchip Technology Inc.
Return from subroutine
1
3 (2)
—
—
—
—
—
—
—
—
—
—
—
5-203
f {,WREG}
Destination = rotate left through Carry f
1
1
—
—
—
—
—
—
—
—
Ws,Wd
Wd = rotate left through Carry Ws
1
1
—
—
—
—
—
—
—
!
!
RLNC
f {,WREG}
Destination = rotate left (no Carry) f
1
1
—
—
—
—
—
—
—
—
5-207
RLNC
Ws,Wd
Wd = rotate left (no Carry) Ws
1
1
—
—
—
—
—
—
—
—
5-208
RRC
f {,WREG}
Destination = rotate right through Carry f
1
1
—
—
—
—
—
—
—
Ws,Wd
Wd = rotate right through Carry Ws
1
1
—
—
—
—
—
—
—
!
!
5-210
RRC
RRNC
f {,WREG}
Destination = rotate right (no Carry) f
1
1
—
—
—
—
—
—
—
—
5-213
Ws,Wd
Wd = rotate right (no Carry) Ws
1
1
—
—
—
—
—
—
—
!
!
!
!
!
!
!
!
5-204
RLC
!
!
!
!
!
!
!
!
—
5-214
RLC
RRNC
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
— unchanged
—
—
—
—
—
—
—
5-205
5-211
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-16
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
SAC
Acc,#Slit4,Wd
Store accumulator
1
1
—
—
—
—
—
—
—
—
—
—
—
5-216
SAC.R
Acc,#Slit4,Wd
Store rounded Accumulator
1
1
—
—
—
—
—
—
—
—
—
—
—
5-218
SE
Ws,Wd
Wd = sign-extended Ws
1
1
—
—
—
—
—
—
—
!
—
!
!
5-220
SETM
f
f = 0xFFFF
1
1
—
—
—
—
—
—
—
—
—
—
—
5-221
SETM
WREG
WREG = 0xFFFF
1
1
—
—
—
—
—
—
—
—
—
—
—
5-221
SETM
Ws
Ws = 0xFFFF
1
1
—
—
—
—
—
—
—
—
—
—
—
5-222
SFTAC
Acc,#Slit6
Arithmetic shift accumulator by Slit6
1
1
!
!
"
"
"
"
!
!
"
"
—
—
—
—
—
5-223
Preliminary
SFTAC
Acc,Wb
Arithmetic shift accumulator by (Wb)
1
1
!
!
—
—
—
—
—
5-224
SL
f {,WREG}
Destination = arithmetic left shift f
1
1
—
—
—
—
—
—
—
—
Ws,Wd
Wd = arithmetic left shift Ws
1
1
—
—
—
—
—
—
—
!
!
5-225
SL
SL
Wb,#lit4,Wnd
Wnd = left shift Wb by lit4
1
1
—
—
—
—
—
—
—
—
5-228
—
5-229
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
5-230
SL
Wb,Wns,Wnd
Wnd = left shift Wb by Wns
1
1
—
—
—
—
—
—
—
SUB
f {,WREG}
Destination = f – WREG
1
1
—
—
—
—
—
—
SUB
#lit10,Wn
Wn = Wn – lit10
1
1
—
—
—
—
—
—
SUB
Wb,#lit5,Wd
Wd = Wb – lit5
1
1
—
—
—
—
—
—
SUB
Wb,Ws,Wd
Wd = Wb – Ws
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
!
!
!
!
SUB
Acc
Subtract accumulators
1
1
!
!
"
"
!
"
—
—
—
—
—
5-235
SUBB
f {,WREG}
destination = f – WREG – (C)
1
1
—
—
—
—
—
—
#lit10,Wn
Wn = Wn – lit10 – (C)
1
1
—
—
—
—
—
—
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
#
#
#
#
#
#
#
!
!
!
!
!
!
!
!
!
!
!
!
!
5-236
SUBB
5-249
Wb,#lit5,Wd
Wd = Wb – lit5 – (C)
1
1
—
—
—
—
—
—
SUBB
Wb,Ws,Wd
Wd = Wb – Ws – (C)
1
1
—
—
—
—
—
—
SUBBR
f {,WREG}
Destination = WREG – f – (C)
1
1
—
—
—
—
—
—
SUBBR
Wb,#lit5,Wd
Wd = lit5 – Wb – (C)
1
1
—
—
—
—
—
—
SUBBR
Wb,Ws,Wd
Wd = Ws – Wb – (C)
1
1
—
—
—
—
—
—
SUBR
f {,WREG}
Destination = WREG – f
1
1
—
—
—
—
—
—
SUBR
Wb,#lit5,Wd
Wd = lit5 – Wb
1
1
—
—
—
—
—
—
SUBR
Wb,Ws,Wd
Wd = Ws – Wb
1
1
—
—
—
—
—
—
—
—
5-226
5-231
5-232
5-233
5-237
5-238
5-239
5-241
5-242
5-243
5-245
5-246
5-247
DS70157B-page 6-17
SWAP
Wn
Wn = byte or nibble swap Wn
1
1
—
—
—
—
—
—
—
—
—
—
—
TBLRDH
Ws,Wd
Read high program word to Wd
1
2
—
—
—
—
—
—
—
—
—
—
—
5-250
TBLRDL
Ws,Wd
Read low program word to Wd
1
2
—
—
—
—
—
—
—
—
—
—
—
5-252
TBLWTH
Ws,Wd
Write Ws to high program word
1
2
—
—
—
—
—
—
—
—
—
—
—
5-254
TBLWTL
Ws,Wd
Write Ws to low program word
1
2
—
—
—
—
—
—
—
—
—
—
—
5-256
Unlink Frame Pointer
1
1
—
—
—
—
—
—
—
—
—
—
—
5-258
ULNK
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
Section 6. Reference
SUBB
!
!
!
!
!
!
!
!
!
!
—
— unchanged
6
Reference
© 2005 Microchip Technology Inc.
Table 6-3:
dsPIC30F/dsPIC33F Instruction Set Summary Table (Continued)
Assembly Syntax
Mnemonic,Operands
Description
Words
Cycles
OA
OB
SA
SB
OAB
SAB
DC
N
OV
Z
C
Page #
—
—
5-259
—
5-260
—
5-261
—
5-262
—
!
!
!
!
!
1
5-264
XOR
f {,WREG}
Destination = f .XOR. WREG
1
1
—
—
—
—
—
—
—
XOR
#lit10,Wn
Wn = lit10 .XOR. Wn
1
1
—
—
—
—
—
—
—
XOR
Wb,#lit5,Wd
Wd = Wb .XOR. lit5
1
1
—
—
—
—
—
—
—
XOR
Wb,Ws,Wd
Wd = Wb .XOR. Ws
1
1
—
—
—
—
—
—
—
!
!
!
!
Ws,Wnd
Wnd = zero-extended Ws
1
1
—
—
—
—
—
—
—
0
ZE
Legend:
Note:
! set or cleared; # may be cleared, but never set; " may be set, but never cleared; ‘1’ always set; ‘0’ always cleared;
SA, SB and SAB are only modified if the corresponding saturation is enabled, otherwise unchanged.
— unchanged
—
—
—
Preliminary
© 2005 Microchip Technology Inc.
dsPIC30F/33F Programmer’s Reference Manual
DS70157B-page 6-18
Table 6-3:
Index
INDEX
I
Accumulator A, Accumulator B .......................................... 2-5
Accumulator Access ........................................................ 4-33
Accumulator Usage.......................................................... 4-32
Addressing Modes for Wd Destination Register ................ 5-3
Addressing Modes for Ws Source Register ....................... 5-3
Assigned Working Register Usage .................................. 4-27
Immediate Addressing ....................................................... 4-9
Operands in the Instruction Set ................................. 4-9
Implied DSP Operands .................................................... 4-27
Implied Frame and Stack Pointer .................................... 4-27
Instruction Bit Map ............................................................. 6-9
Instruction Description Example ........................................ 5-6
Instruction Descriptions ..................................................... 5-7
ADD (16-bit Signed Add to Accumulator) ................ 5-12
ADD (Add Accumulators) ........................................ 5-11
ADD (Add f to WREG) ............................................... 5-7
ADD (Add Literal to Wn) ............................................ 5-8
ADD (Add Wb to Short Literal) .................................. 5-9
ADD (Add Wb to Ws)............................................... 5-10
ADDC (Add f to WREG with Carry) ......................... 5-14
ADDC (Add Literal to Wn with Carry) ...................... 5-15
ADDC (Add Wb to Short Literal with Carry)............. 5-16
ADDC (Add Wb to Ws with Carry)........................... 5-17
AND (AND f and WREG) ......................................... 5-19
AND (AND Literal and Wd)...................................... 5-20
AND (AND Wb and Short Literal) ............................ 5-21
AND (AND Wb and Ws) .......................................... 5-22
ASR (Arithmetic Shift Right by Short Literal) ........... 5-27
ASR (Arithmetic Shift Right by Wns) ....................... 5-28
ASR (Arithmetic Shift Right f) .................................. 5-24
ASR (Arithmetic Shift Right Ws) .............................. 5-25
BCLR (Bit Clear in Ws)............................................ 5-30
BCLR.B (Bit Clear f) ................................................ 5-29
BRA (Branch Unconditionally) ................................. 5-31
BRA (Computed Branch)......................................... 5-32
BRA C (Branch if Carry) .......................................... 5-33
BRA GE (Branch if Signed Greater Than
or Equal) .......................................................... 5-35
BRA GEU (Branch if Unsigned Greater Than
or Equal) .......................................................... 5-36
BRA GT (Branch if Signed Greater Than) ............... 5-37
BRA GTU (Branch if Unsigned Greater Than) ........ 5-38
BRA LE (Branch if Signed Less Than or Equal)...... 5-39
BRA LEU (Branch if Unsigned Less Than
or Equal) .......................................................... 5-40
BRA LT (Branch if Signed Less Than) .................... 5-41
BRA LTU (Branch if Not Carry) ............................... 5-44
BRA LTU (Branch if Unsigned Less Than).............. 5-42
BRA N (Branch if Negative)..................................... 5-43
BRA NN (Branch if Not Negative)............................ 5-45
BRA NOV (Branch if Not Overflow) ......................... 5-46
BRA NZ (Branch if Not Zero)................................... 5-47
BRA OA (Branch if Overflow Accumulator A) .......... 5-48
BRA OB (Branch if Overflow Accumulator B) .......... 5-49
BRA OV (Branch if Overflow) .................................. 5-50
BRA SA (Branch if Saturation Accumulator A) ........ 5-51
BRA SB (Branch if Saturation Accumulator B) ........ 5-52
BRA Z (Branch if Zero) ............................................ 5-53
BSET (Bit Set f) ....................................................... 5-54
BSET (Bit Set in Ws) ............................................... 5-55
BSW (Bit Write in Ws) ............................................. 5-56
BTG (Bit Toggle f).................................................... 5-58
BTG (Bit Toggle in Ws)............................................ 5-59
BTSC (Bit Test f, Skip if Clear) ................................ 5-60
BTSC (Bit Test Ws, Skip if Clear)............................ 5-62
BTSS (Bit Test f, Skip if Set) ................................... 5-64
BTSS (Bit Test Ws, Skip if Set) ............................... 5-65
BTST (Bit Test f)...................................................... 5-67
BTST (Bit Test in Ws)..................................... 5-68, 5-69
B
Byte Operations ............................................................... 4-13
C
Code Examples
‘Z’ Status bit Operation for 32-bit Addition ............... 4-26
Base MAC Syntax.................................................... 4-35
File Register Addressing............................................ 4-3
File Register Addressing and WREG......................... 4-3
Frame Pointer Usage............................................... 4-23
Illegal Word Move Operations.................................. 4-18
Immediate Addressing ............................................. 4-10
Indirect Addressing with Effective Address Update ... 4-6
Indirect Addressing with Register Offset.................... 4-7
Legal Word Move Operations .................................. 4-17
MAC Accumulator WB Syntax ................................. 4-36
MAC Prefetch Syntax............................................... 4-35
Move with Literal Offset Instructions .......................... 4-7
MSC Instruction with Two Prefetches and
Accumulator Write Back .................................. 4-36
Normalizing with FBCL ............................................ 4-39
Register Direct Addressing ........................................ 4-4
Sample Byte Math Operations ................................. 4-15
Sample Byte Move Operations ................................ 4-14
Scaling with FBCL.................................................... 4-38
Stack Pointer Usage ................................................ 4-21
Unsigned f and WREG Multiply (Legacy MULWF
Instruction) ....................................................... 4-29
Using 10-bit Literals for Byte Operands ................... 4-19
Using the Default Working Register WREG............. 4-28
Conditional Branch Instructions ....................................... 4-25
Core Control Register ........................................................ 2-9
Core Special Function Register Map ................................. 6-4
D
Data Addressing Mode Tree ............................................ 4-10
Data Addressing Modes..................................................... 4-2
Data Memory Map ............................................................. 6-2
DCOUNT Register ............................................................. 2-6
Default Working Register (WREG) ...........................2-3, 4-28
Development Support ........................................................ 1-2
DOEND Register................................................................ 2-6
DOSTART Register ........................................................... 2-6
DSP Accumulator Instructions ......................................... 4-37
DSP Data Formats ........................................................... 4-30
DSP MAC Indirect Addressing Modes ............................... 4-8
DSP MAC Instructions ..................................................... 4-33
dsPIC30F/33F Overview .................................................... 2-2
F
File Register Addressing .................................................... 4-2
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 7-1
Index
A
dsPIC30F/33F Programmer’s Reference Manual
BTSTS (Bit Test/Set f) ............................................. 5-71
BTSTS (Bit Test/Set in Ws) ..................................... 5-72
CALL (Call Indirect Subroutine) ............................... 5-74
CALL (Call Subroutine) ............................................ 5-73
CLR (Clear Accumulator, Prefetch Operands)......... 5-77
CLR (Clear f or WREG) ........................................... 5-75
CLR (Clear Wd) ....................................................... 5-76
CLRWDT (Clear Watchdog Timer) .......................... 5-79
COM (Complement f) ............................................... 5-80
COM (Complement Ws)........................................... 5-81
CP (Compare f with WREG, Set Status Flags) ........5-82
CP (Compare Wb with lit5, Set Status Flags) .......... 5-83
CP (Compare Wb with Ws, Set Status Flags) ......... 5-84
CP0 (Compare f with 0x0, Set Status Flags) ........... 5-85
CP0 (Compare Ws with 0x0, Set Status Flags) ....... 5-86
CPB (Compare f with WREG using Borrow,
Set Status Flags) ............................................. 5-87
CPB (Compare Wb with lit5 using Borrow,
Set Status Flags) ............................................. 5-88
CPB (Compare Ws with Wb using Borrow,
Set Status Flags) ............................................. 5-89
CPSEQ (Compare Wb with Wn, Skip if Equal) ........5-91
CPSGT (Signed Compare Wb with Wn, Skip
if Greater Than)................................................5-92
CPSLT (Signed Compare Wb with Wn, Skip
if Less Than) .................................................... 5-93
CPSNE (Signed Compare Wb with Wn, Skip
if Not Equal) ..................................................... 5-94
DAW.B (Decimal Adjust Wn) ................................... 5-95
DEC (Decrement f) ..................................................5-96
DEC (Decrement Ws) ..............................................5-97
DEC2 (Decrement f by 2)......................................... 5-98
DEC2 (Decrement Ws by 2) .................................... 5-99
DISI (Disable Interrupts Temporarily) .................... 5-100
DIV.S (Signed Integer Divide) ................................ 5-101
DIV.U (Unsigned Integer Divide)............................ 5-103
DIVF (Fractional Divide)......................................... 5-105
DO (Initialize Hardware Loop Literal) ..................... 5-107
DO (Initialize Hardware Loop Wn) .........................5-109
ED (Euclidean Distance, No Accumulate) ............. 5-111
EDAC (Euclidean Distance) ................................... 5-113
EXCH (Exchange Wns and Wnd) .......................... 5-115
FBCL (Find First Bit Change from Left) ................. 5-116
FF1L (Find First One from Left) ............................. 5-118
FF1R (Find First One from Right) .......................... 5-120
GOTO (Unconditional Indirect Jump)..................... 5-123
GOTO (Unconditional Jump) ................................. 5-122
INC (Increment f) ................................................... 5-124
INC (Increment Ws) ............................................... 5-125
INC2 (Increment f by 2).......................................... 5-126
INC2 (Increment Ws by 2) ..................................... 5-127
IOR (Inclusive OR f and WREG)............................ 5-128
IOR (Inclusive OR Literal and Wn).........................5-129
IOR (Inclusive OR Wb and Short Literal) ............... 5-130
IOR (Inclusive OR Wb and Ws) ............................. 5-131
LAC (Load Accumulator)........................................ 5-133
LNK (Allocate Stack Frame) .................................. 5-135
LSR (Logical Shift Right by Short Literal) .............. 5-139
LSR (Logical Shift Right by Wns)...........................5-140
LSR (Logical Shift Right f)...................................... 5-136
LSR (Logical Shift Right Ws) ................................. 5-137
MAC (Multiply and Accumulate)............................. 5-141
MAC (Square and Accumulate) ............................. 5-143
MOV (Move 16-bit Literal to Wn) ...........................5-150
MOV (Move f to Destination).................................. 5-145
MOV (Move f to Wnd) ............................................5-147
MOV (Move Wns to [Wd with offset]) ..................... 5-152
DS70157B-page 7-2
Preliminary
MOV (Move Wns to f) ............................................ 5-148
MOV (Move WREG to f) ........................................ 5-146
MOV (Move Ws to Wd).......................................... 5-153
MOV (Move Ws with offset to Wnd)....................... 5-151
MOV.B (Move 8-bit Literal to Wnd)........................ 5-149
MOV.D (Double-Word Move from Source
to Wnd) .......................................................... 5-155
MOV.D (Double-Word Move from Wns
to Destination) ............................................... 5-157
MOVSAC (Prefetch Operands and Store
Accumulator) ................................................. 5-159
MPY (Multiply Wm by Wn to Accumulator)............ 5-161
MPY (Square to Accumulator) ............................... 5-163
MPY.N (Multiply -Wm by Wn to Accumulator) ....... 5-165
MSC (Multiply and Subtract from Accumulator)..... 5-167
MUL (Integer Unsigned Multiply f and WREG) ...... 5-169
MUL.SS (Integer 16x16-bit Signed Multiply).......... 5-170
MUL.SU (Integer 16x16-bit Signed-Unsigned
Multiply) ......................................................... 5-174
MUL.SU (Integer 16x16-bit Signed-Unsigned
Short Literal Multiply)..................................... 5-172
MUL.US (Integer 16x16-bit Unsigned-Signed
Multiply) ......................................................... 5-176
MUL.UU (Integer 16x16-bit Unsigned Multiply) ..... 5-179
MUL.UU (Integer 16x16-bit Unsigned Short
Literal Multiply) .............................................. 5-178
NEG (Negate Accumulator) ................................... 5-183
NEG (Negate f) ...................................................... 5-181
NEG (Negate Ws).................................................. 5-182
NOP (No Operation) .............................................. 5-184
NOPR (No Operation)............................................ 5-185
POP (Pop TOS to f) ............................................... 5-186
POP (Pop TOS to Wd)........................................... 5-187
POP.D (Double Pop TOS to Wnd/
Wnd+1) .......................................................... 5-188
POP.S (Pop Shadow Registers)............................ 5-189
PUSH (Push f to TOS)........................................... 5-190
PUSH (Push Ws to TOS)....................................... 5-191
PUSH.D (Double Push Wns/
Wns+1 to TOS).............................................. 5-192
PUSH.S (Push Shadow Registers)........................ 5-193
PWRSAV (Enter Power Saving Mode) .................. 5-194
RCALL (Computed Relative Call) .......................... 5-196
RCALL (Relative Call)............................................ 5-195
REPEAT (Repeat Next Instruction ’lit14’ Times) ... 5-197
REPEAT (Repeat Next Instruction Wn Times) ...... 5-198
RESET (Reset) ...................................................... 5-200
RETFIE (Return from Interrupt) ............................. 5-201
RETLW (Return with Literal in Wn)........................ 5-202
RETURN (Return).................................................. 5-203
RLC (Rotate Left f through Carry).......................... 5-204
RLC (Rotate Left Ws through Carry) ..................... 5-205
RLNC (Rotate Left f without Carry)........................ 5-207
RLNC (Rotate Left Ws without Carry).................... 5-208
RRC (Rotate Right f through Carry)....................... 5-210
RRC (Rotate Right Ws through Carry) .................. 5-211
RRNC (Rotate Right f without Carry)..................... 5-213
RRNC (Rotate Right Ws without Carry)................. 5-214
SAC (Store Accumulator) ...................................... 5-216
SAC.R (Store Rounded Accumulator) ................... 5-218
SE (Sign-Extend Ws)............................................. 5-220
SETM (Set f or WREG).......................................... 5-221
SETM (Set Ws)...................................................... 5-222
SFTAC (Arithmetic Shift Accumulator by Slit5)...... 5-223
SFTAC (Arithmetic Shift Accumulator by Wb) ....... 5-224
SL (Shift Left by Short Literal)................................ 5-228
SL (Shift Left by Wns)............................................ 5-229
© 2005 Microchip Technology Inc.
Index
© 2005 Microchip Technology Inc.
Slit5............................................................................ 1-4
TOS ........................................................................... 1-4
Wb ............................................................................. 1-4
Wd ............................................................................. 1-4
Wm*Wm .................................................................... 1-4
Wm*Wn ..................................................................... 1-4
Wm, Wn..................................................................... 1-4
Wn ............................................................................. 1-4
Wnd ........................................................................... 1-4
Wns ........................................................................... 1-4
WREG ....................................................................... 1-4
Ws ............................................................................. 1-4
Wx ............................................................................. 1-4
Wxd ........................................................................... 1-4
Wy ............................................................................. 1-4
Wyd ........................................................................... 1-4
Instruction Stalls .............................................................. 4-12
DO/REPEAT Loops ................................................. 4-13
Exceptions ............................................................... 4-13
Instructions that Change Program Flow .................. 4-13
PSV ......................................................................... 4-13
RAW Dependency Detection................................... 4-12
Instruction Symbols ........................................................... 5-2
Integer and Fractional Data ............................................. 4-30
Representation ........................................................ 4-31
Interrupt Priority Level........................................................ 2-8
Introduction ........................................................................ 1-2
M
MAC
Operations ............................................................... 4-34
Prefetch Register Updates ...................................... 4-34
Prefetches ............................................................... 4-33
Syntax...................................................................... 4-34
Write Back ............................................................... 4-34
MAC Accumulator Write Back Selection............................ 5-5
MAC or MPY Source Operands (Different Working
Register) .................................................................... 5-5
MAC or MPY Source Operands (Same Working
Register) .................................................................... 5-5
Manual Objective ............................................................... 1-2
Microchip Documentation .................................................. 1-5
Modulo and Bit-Reversed Addressing Modes ................... 4-8
Multi-Cycle Instructions...................................................... 3-2
Multi-Word Instructions ...................................................... 3-3
N
Normalizing the Accumulator with the FBCL Instruction.. 4-39
O
Offset Addressing Modes for Wd Destination
Register (with Register Offset) .................................. 5-3
Offset Addressing Modes for Ws Source Register
(with Register Offset)................................................. 5-3
Preliminary
DS70157B-page 7-3
Index
SL (Shift Left f) ....................................................... 5-225
SL (Shift Left Ws)................................................... 5-226
SUB (Subtract Accumulators) ................................ 5-235
SUB (Subtract Literal from Wn) ............................. 5-231
SUB (Subtract Short Literal from Wb).................... 5-232
SUB (Subtract WREG from f) ................................ 5-230
SUB (Subtract Ws from Wb) .................................. 5-233
SUBB (Subtract Short Literal from Wb
with Borrow) ................................................... 5-238
SUBB (Subtract Wn from Literal with Borrow) ....... 5-237
SUBB (Subtract WREG and Carry bit from f) ........ 5-236
SUBB (Subtract Ws from Wb with Borrow)............ 5-239
SUBBR (Subtract f from WREG with Borrow)........ 5-241
SUBBR (Subtract Wb from Short Literal
with Borrow) ................................................... 5-242
SUBBR (Subtract Wb from Ws with Borrow) ......... 5-243
SUBR (Subtract f from WREG).............................. 5-245
SUBR (Subtract Wb from Short Literal) ................. 5-246
SUBR (Subtract Wb from Ws) ............................... 5-247
SWAP (Byte or Nibble Swap Wn) .......................... 5-249
TBLRDH (Table Read High) .................................. 5-250
TBLRDL (Table Read Low).................................... 5-252
TBLWTH (Table Write High) .................................. 5-254
TBLWTL (Table Write Low) ................................... 5-256
ULNK (De-allocate Stack Frame) .......................... 5-258
XOR (Exclusive OR f and WREG) ......................... 5-259
XOR (Exclusive OR Literal and Wn) ...................... 5-260
XOR (Exclusive OR Wb and Short Literal) ............ 5-261
XOR (Exclusive OR Wb and Ws)........................... 5-262
ZE (Zero-Extend Wn)............................................. 5-264
Instruction Encoding Field Descriptors Introduction........... 5-2
Instruction Set Overview .................................................... 3-2
Bit Instructions ........................................................... 3-7
Compare/Skip Instructions......................................... 3-8
Control Instructions .................................................. 3-10
DSP Instructions ...................................................... 3-10
dsPIC30F/33F Instruction Groups ............................. 3-2
Logic Instructions ....................................................... 3-5
Math Instructions........................................................ 3-4
Move Instructions....................................................... 3-3
Program Flow Instructions ......................................... 3-9
Rotate/Shift Instructions............................................. 3-6
Shadow/Stack Instructions....................................... 3-10
Instruction Set Summary Table........................................ 6-11
Instruction Set Symbols ..................................................... 1-4
#text ........................................................................... 1-4
(text)........................................................................... 1-4
<n:m>......................................................................... 1-4
[text] ........................................................................... 1-4
{ }................................................................................ 1-4
{label:} ........................................................................ 1-4
Acc ............................................................................. 1-4
AWB........................................................................... 1-4
bit4 ............................................................................. 1-4
Expr............................................................................ 1-4
f .................................................................................. 1-4
lit1 .............................................................................. 1-4
lit10 ............................................................................ 1-4
lit14 ............................................................................ 1-4
lit16 ............................................................................ 1-4
lit23 ............................................................................ 1-4
lit4 .............................................................................. 1-4
lit5 .............................................................................. 1-4
lit8 .............................................................................. 1-4
Slit10 .......................................................................... 1-4
Slit16 .......................................................................... 1-4
Slit4 ............................................................................ 1-4
dsPIC30F/33F Programmer’s Reference Manual
P
X
PICmicro® Microcontroller Compatibility .......................... 4-28
PRODH
PRODL Register Pair ............................................... 4-28
Program Addressing Modes............................................. 4-11
Methods of Modifying Flow ...................................... 4-11
Program Counter................................................................ 2-5
Program Memory Map ....................................................... 6-7
Programmer’s Model.......................................................... 2-3
Diagram .....................................................................2-4
Register Descriptions ................................................. 2-3
PSVPAG Register .............................................................. 2-5
X Data Space Prefetch Destination ................................... 5-4
X Data Space Prefetch Operation ..................................... 5-4
Y
Y Data Space Prefetch Destination ................................... 5-5
Y Data Space Prefetch Operation ..................................... 5-4
Z
Z Status Bit ...................................................................... 4-26
R
RCOUNT Register ............................................................. 2-6
Register Direct Addressing ................................................4-4
Register Indirect Addressing .............................................. 4-5
Modes ........................................................................ 4-5
Register Indirect Addressing and the Instruction Set ......... 4-8
Registers
CORCON (Core Control) Register ...........................2-12
SR (Status) Register ................................................2-10
Related Documents............................................................ 1-5
S
Scaling Data with the FBCL Instruction............................ 4-37
Scaling Examples .................................................... 4-38
Shadow Registers .............................................................. 2-9
Automatic Usage........................................................ 2-9
Software Stack Frame Pointer ..................................2-3, 4-22
Example ...................................................................4-23
Overflow ...................................................................4-24
Underflow ................................................................. 4-24
Software Stack Pointer..............................................2-5, 4-20
Example ...................................................................4-21
Stack Pointer Limit Register (SPLIM)................................. 2-5
Status Register................................................................... 2-7
DSP ALU Status Bits ................................................. 2-8
Loop Status Bits ......................................................... 2-7
MCU ALU Status Bits................................................. 2-7
Style and Symbol Conventions .......................................... 1-3
Document Conventions.............................................. 1-3
T
TBLPAG Register............................................................... 2-5
Third Party Documentation ................................................1-5
U
Using 10-bit Literal Operands .......................................... 4-19
10-bit Literal Coding ................................................. 4-19
W
Word Move Operations .................................................... 4-16
Data Alignment in Memory....................................... 4-16
Working Register Array ...................................................... 2-3
DS70157B-page 7-4
Preliminary
© 2005 Microchip Technology Inc.
Index
NOTES:
Index
© 2005 Microchip Technology Inc.
Preliminary
DS70157B-page 7-5
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DS70157B
© 2005 Microchip Technology Inc.