Motorola DSP56305 Manuel d'utilisateur Page 92
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Noté. / 5. Basé sur avis des utilisateurs
Compact Opcode Use
Peripheral Addressing
MOTOROLA Optimizing DSP56300/DSP56600 Applications 7-7
7.2.5 Register Addressing
The register addressing can also be used to decrease the total cycle
count. The next example is an implementation of a jump table that
uses register addressing. The code is used when exiting reset to
jump to a location that corresponds to the specific mode that was
chosen at power up:
org p:$400
move omr,a
and #<$7,a
move #j_table,r0
move a,n0
move p:(r0+n0),r0
jmp (r0)
j_table ;jump table starting address
dc 1ST_R ;If MC:MB:MA=000, goto 1st routine
dc 2ND_R ;If MC:MB:MA=001, goto 2nd routine
dc 3RD_R ;If MC:MB:MA=010, goto 3rd routine
dc 4TH_R ;If MC:MB:MA=011, goto 4th routine
dc 5TH_R ;If MC:MB:MA=100, goto 5th routine
dc 6TH_R ;If MC:MB:MA=101, goto 6th routine
dc 7TH_R ;If MC:MB:MA=110, goto 7th routine
dc 8TH_R ;If MC:MB:MA=111, goto 8th routine
7.2.6 Word Count
Some instructions have single word versions that should be used
when possible. It is advisable to consult the Family Manuals for
details on the word count of the various instructions.
7.3 PERIPHERAL ADDRESSING
The on-chip peripherals have special addressing modes. Moving
data to/from an on-chip peripheral can be done by a MOVEP
instruction, where the address of the peripheral is defined by very
few address bits as part of the opcode.
The use of MOVEP usually does not save execution time, but makes
it possible to put two MOVEP instructions in an interrupt vector,
instead of only one if a long absolute addressing mode is used.
- 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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