Motorola DSP56305 Manuel d'utilisateur Page 43
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- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
3-14 Optimizing DSP56300/DSP56600 Applications MOTOROLA
Program Control
PC Relative Instructions
In absolute addressing, the argument is the numerical value of the
address. In PC relative addressing, the argument is the
displacement of the address relative to the PC. For both absolute
and PC addressing, the address argument could be specified in one
of four ways:
1. explicit, as part of the 1-word opcode (restricted to short
arguments),
2. explicit, as a second program word ,
3. stored in a register , or,
4. indirect, stored in the memory and accessed by one of the
addressing modes <ea>.
A full list of instructions requiring a program location argument
and the possible addressing modes for each is summarized in
Table 3-5. The shaded sections in the table indicate instructions that
use PC relative arguments.
Note: The instructions LRA (load PC relative address) and LUA
(load effective address) can be used to calculate and load PC
relative address or an effective address, respectively. LRA is
a very efficient and common way for a program to monitor
directly the PC value during runtime.
Note: The DSP56600 does not include the complete set of
PC-Relative instructions like the DSP56300. There is also a
way to disable all the PC-Relative instructions on the
DSP56600 by setting a special mode bit, the PCD (PC relative
logic Disable) which is Bit 5 in the Operating Mode Register
(OMR). For details please see the
DSP56600 Family Manual
.
Table 3-5 Instructions with Program Memory Arguments
Function
Address
Argument
Mnemonic
The Address Argument
Encoded in the
opcode
(total 1 w)
2nd
word
Register Data
Memory
<ea>
unconditional
jump
destination
JMP addr < 4096 + – +
BRA –257 <
disp < 256
+ + –
jump on CCR
condition
destination
Jcc address <
4096
+– +
Bcc –257 <
disp < 256
+ + –
- DSP56300/DSP56600 1
- Digital Signal 1
- Processors 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 6
- LIST OF TABLES 7
- INTRODUCTION 8
- 1.2 DSP56600 CORE FAMILY 9
- Table 1-1 11
- Introduction 12
- Description and Use 13
- Application Note Structure 14
- 1.4.3 Appendixes 15
- DATA OPERATIONS 16
- DSP56300 Family Manual 21
- 2.3 THE MAX INSTRUCTION 22
- 2.4 USING THE BARREL SHIFTER 23
- Data Operations 24
- Using the barrel shifter 24
- DSP56300 26
- DSP56600 Family 26
- Double precision arithmetic 27
- INSTRUCTIONS 28
- PROGRAM CONTROL 30
- Program Control 31
- Hardware Loops 31
- 3.2 THE HARDWARE STACK 32
- DSP56600 Family Manuals 35
- 3.3 USING THE STACK EXTENSION 36
- Using the Stack Extension 37
- EXTENSION 39
- Conditional DALU Instructions 40
- 3.6 PC RELATIVE INSTRUCTIONS 42
- DSP56600 Family Manual 43
- 3.7 USING FAST INTERRUPTS 46
- Using Fast Interrupts 48
- USING THE DMA 50
- Using the DMA 51
- Using Slow, Low-Cost Memories 54
- 4.4 SERVICING A PERIPHERAL 55
- Servicing a Peripheral 56
- Section 5 62
- 5.1 THE INSTRUCTION CACHE 62
- 5.1.1 Cache Sectors 64
- The Instruction Cache 65
- 5.1.3 Cache Burst Mode 67
- 5.2 MEMORY SWITCH 70
- Memory Switch 71
- 5.3 USING THE BOOTSTRAP ROM 72
- Using the Bootstrap ROM 73
- PIPELINE INTERLOCKS 74
- Pipeline Interlocks 75
- Data ALU Pipeline Interlocks 75
- DSP56000 Family Manual 76
- INTERLOCKS 80
- Interlocks 80
- 6.3 STACK EXTENSION DELAYS 81
- Interlocks? 83
- COMPACT OPCODE USE 86
- Instructions 87
- Compact Opcode Use 89
- Cycle Count of an Instruction 89
- 7.2 ADDRESSING MODES 90
- 7.2.2 Short Addressing Mode 91
- 7.2.3 Short Immediate Mode 91
- 7.2.5 Register Addressing 92
- 7.2.6 Word Count 92
- 7.3 PERIPHERAL ADDRESSING 92
- 7.4 SPECIAL INSTRUCTIONS 93
- 7.4.1 Dual Data Spaces 93
- 7.4.3 Clearing Registers 94
- Special Instructions 95
- SAVING POWER 96
- A.1.2 Stop Standby Mode 97
- A.1.3 Low-Power Clock Divider 97
- Saving Power 98
- Disabling Functional Blocks 98
- DEBUG AND TEST SUPPORT 100
- B.2 JTAG PORT FEATURES 101
- B.3 ADDRESS TRACING 102
- Debug and Test Support 103
- Address Tracing 103
- USING THE PROFILER 104
- C.3 THE PROFILING REPORT 105
- C.3.1 Basic Report 105
- C.3.2 Symbol Report 106
- Using the Profiler 107
- C.3.4 Code Coverage Report 108
- C.3.5 Basic Subroutine Report 109
- C.3.8 Subroutine Call Report 111
- C.4 USING THE PROFILE REPORT 111
- How to reach us: 112
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