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Program Control
Conditional DALU Instructions
MOTOROLA Optimizing DSP56300/DSP56600 Applications 3-11
5. In order to activate the new task T2, the Operating System
dispatcher should first restore the task T2 programming
model:
move #T2_task_reg_area,r7 ;Load pointer.
move x:(r7)+,x0 ;Restore registers...
....
move r7,n0 ;save pointer
move x:(r7)+,r7 ;Restore r7 w/ T2 data
move x:(r7)+,x:OS_r7_temp ;Keep r7.
move n0,r7 ;restore pointer
move x:(r7)+,n0 ;Restore n0
move x:(r7)+,n1 ;Restore n1
....
move x:(r7)+,lc
move x:(r7)+,la
6. The second thing the Operating System dispatcher should do
is to restore the stack status:
move x:(r7)+,sc
move sc,x:OS_SC_temp
move x:-(r0),sp ;Restore SP.
move x:-(r0),ep ;Restore EP.
move #2,sc ;reset Stack Counter.
rep #14
move ssh,x:OS_dummy
move x:OS_sc_temp,sc ;Restore sc.
move x:OS_r7_temp,r7 ;Restore r7.
7. The last thing the Operating System dispatcher should do is
to execute an RTI instruction, which will give control back to
the new task T2:
;Activate T2:
rti
3.5 CONDITIONAL DALU INSTRUCTIONS
The DSP56300/600 instruction set has a group of arithmetic
instructions that could be executed conditionally, depending on the
value of bits in the CCR (Condition Code Register). For example, the
instruction:
add x0,a IFne
adds register X0 to the accumulator A only if the Zero bit in the CCR
is not set. Otherwise, the instruction is executed as a NOP. The
instruction in the above example does not update the CCR, thus
keeping the status unaltered for subsequent use. The user may
- 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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