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Program Control
PC Relative Instructions
MOTOROLA Optimizing DSP56300/DSP56600 Applications 3-13
add b,x1
bra _CONT
_TRUE
add b,x0
_CONT
.....
Using conditional instructions, the code can be written more
compactly, as listed below:
cmp Y0,a
add b,x0 IFeq
add b,x1 IFne
The only difference between the two codes is that the Status
Register in the later option is not updated according to the
calculation result. Conditional execution with CCR update may in
some cases solve the problem, as in the following example:
btst #0,a0 ;CCR is updated according to the
asr a IFcs.U ;value of A if the instruction
;was executed.
Another example of using the CCR update is setting a complex
condition by accumulating simple comparison results. For example,
consider the high-level code line and its translation in assembly
listed below:
if
(X0 < A && X1 < A)
then
{A=A+y0; b=b+y0}
cmp X0,a x:(r0),x1 ;test for X0<a. parallel field
;used to set X1 for next cmp
cmp X1,a IFgt.U ;test for X1<a only if the last
;condition was true.
add y0,a IFgt ;A=A+y0,B=B+y0 only if both
;conditions were true.
add y0,b IFgt
3.6 PC RELATIVE INSTRUCTIONS
Many of the DSP56300 control instructions require a program
location as one of their arguments. The most obvious example is a
jump instruction, which needs the jump address. A strong feature of
the DSP56300 instruction set is the ability to reference program
locations relative to the Program Counter. Almost all instructions
that need program location arguments can be given both PC relative
and an absolute address. In the
DSP56300 Family Manual
, using
traditional mnemonic convention, jumps using PC relative
addressing are referred to as “branches”, while those using absolute
addressing are referred to as “jumps”.
- 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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