Texas-instruments MSP50C6xx Manuel d'utilisateur Page 353
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Beware of Stack Corruption
5-57Code Development Tools
5.8 Beware of Stack Corruption
MSP50C614/MSP50P614 stack (pointed by R7 register) can easily get
corrupted if care is not taken. Notice the following table read code:
SUBB R7, 4
MOV A0, *R7––
ADD A0, address
MOV A0, *A0
ADD A0, *R7––
MOV A0, *A0
RET
This code will work perfectly well if no interrupts happen before SUBB and
MOV instruction. If interrupts do happen between SUBB and MOV
instructions, the parameter in the stack is corrupted by the return address
pushed by the hardware. This problem may not be easily observed in the
system level. But once it happens, it is very difficult to debug. Use the following
method to modify stack pointer instead:
MOV A0, *R7 + –2 * 2
ADD A0, address
MOV A0, *A0
ADD A0, *R7 + –2 * 1
MOV A0, *A0
RET
This method will not have the stack corruption problem since the MOV instruc-
tion performs the entire operation either before or after an interrupt.
- User’s Guide 1
- Read This First 3
- Notational Conventions 4
- Trademarks 5
- Contents 10
- Introduction to the MSP50C6xx 15
- 1.1 Features of the MSP50C6xx 16
- 1.2 Applications 17
- Development Device: MSP50P614 18
- Figure 1–3. RESET Circuit 22
- MSP50C6xx Architecture 25
- 2.1 Architecture Overview 26
- 2-3MSP50C6xx Architecture 27
- 2.2 Computation Unit 29
- Computation Unit 30
- 2.2.2 Arithmetic Logic Unit 31
- 2-9MSP50C6xx Architecture 33
- 2.3 Data Memory Address Unit 35
- 2.3.1 RAM Configuration 36
- Data Memory Address Unit 37
- 2-13MSP50C6xx Architecture 37
- 2.4 Program Counter Unit 38
- 2.5 Bit Logic Unit 38
- 2.6.1 Memory Map 39
- 2-17MSP50C6xx Architecture 41
- 2.6.3 Interrupt Vectors 42
- 2.6.4 ROM Code Security 43
- 2.7 Interrupt Logic 46
- Interrupt Logic 48
- 2-25MSP50C6xx Architecture 49
- 2.8 Clock Control 50
- Figure 2–9. PLL Performance 51
- Clock Control 52
- 2.9 Timer Registers 55
- Timer Registers 56
- 2.10 Reduced Power Modes 57
- Reduced Power Modes 58
- Table 2–4) 62
- 2.11 Execution Timing 64
- Peripheral Functions 65
- 3.1.2 Dedicated Input Port F 68
- 3.1.3 Dedicated Output Port G 69
- 3.1.4 Branch on D Port 70
- Table 3–1. Interrupts 72
- 3.2.3 PDM Clock Divider 75
- Figure 3–1. PDM Clock Divider 75
- 3-13Peripheral Functions 77
- 3.3 Comparator 79
- 3-19Peripheral Functions 83
- 3-21Peripheral Functions 85
- Chapter 4 87
- 4.1 Introduction 88
- 4.2 System Registers 88
- 4.2.5 Top of Stack, (TOS) 89
- 4.2.8 Accumulators (AC0–AC31) 90
- System Registers 91
- Bit Bits 16 – 5 4 3 2 1 0 91
- AP0–AP3 Not used Points to An 91
- 4.2.11 String Register (STR) 92
- 4.2.12 Status Register (STAT) 92
- 4.3.2 Addressing Modes 95
- Table 4–3. Rx Bit Description 96
- 4.3.3 Immediate Addressing 99
- 4.3.4 Direct Addressing 100
- 4.3.5 Indirect Addressing 101
- 4.3.6 Relative Addressing 102
- 4.3.7 Flag Addressing 105
- 4.3.8 Tag/Flag Bits 106
- Table 4–11 109
- Instruction Classification 111
- Class 1b 0 1 C1b s An adrs 112
- Hardware Loop Instructions 139
- 4.8 String Instructions 141
- String Instructions 142
- 4.9 Lookup Instructions 143
- Interrupt 144
- FIRK_COEFFS 152
- N+1 Taps 153
- 4.12 Conditionals 155
- 4.13 Legend 156
- 4.14.1 ADD Add word 161
- 4.14.2 ADDB ADD BYTE 163
- 4.14.3 ADDS Add String 164
- 4.14.4 AND Bitwise AND 166
- 4.14.5 ANDB Bitwise AND Byte 168
- 4.14.7 BEGLOOP Begin Loop 170
- Table 4–48. Names for cc 174
- 4.14.10 CMP Compare Two Words 177
- Example 4.14.10.4 CMP R0, R5 178
- CMPB An, imm8 1 1 N/R 2a 179
- CMPB Rx, imm8 1 1 N/R 4b 179
- 4.14.15 ENDLOOP End Loop 183
- EXTSGN An[~] [, next A] 1 1 n 184
- MOV AP0, 0 185
- See Also EXTSGN 186
- Example 4.14.17.1 EXTSGNS A0~ 186
- See Also RPT, FIRK, COR, CORK 188
- Example 4.14.18.1 RPT 0 188
- FIR A0, *R0 188
- 4.14.20 IDLE Halt Processor 190
- INTD 1 1 N/R 9d 193
- 4.14.24 INTE Interrupt Enable 194
- IRET 2 1 N/R 5 195
- 4.14.26 Jcc Conditional Jumps 196
- Syntax Description 205
- MOVAPH An, MR, {adrs} 207
- 0 1 1 0 1 0 0 An adrs 207
- MOVAPHS An, MR, {adrs} 208
- 0 1 1 0 1 0 1 An adrs 208
- MOVSPH An, MR, {adrs} 214
- 0 1 1 0 0 1 0 An adrs 214
- MOVSPHS An, MR, {adrs} 215
- 0 1 1 0 0 1 1 An adrs 215
- MOVT {adrs}, TFn 216
- 1 1 0 1 0 1 1 1 fig adrs 216
- NOTE: B = Byte move possible 218
- S = String move possible 218
- MULR [adrs] 220
- 1 1 0 1 1 1 0 1 0 adrs 220
- 4.14.49 NOP No Operation 230
- 4.14.52 OR Bitwise Logical OR 233
- 4.14.53 ORB Bitwise OR Byte 235
- 4.14.54 ORS Bitwise OR String 236
- 4.14.55 OUT Output to Port 237
- RET 1 1 N/R 5 239
- RFLAG {flagadrs} 1 1 N/R 8a 240
- RFM 1 1 N/R 9d 241
- ROVM 1 1 N/R 9d 242
- 4.14.62 RTAG Reset Tag 244
- RXM 1 1 N/R 9d 245
- 4.14.64 SFLAG Set Memory Flag 246
- SFM 1 1 N/R 9d 247
- 4.14.66 SHL Shift Left 248
- SOVM 1 1 N/R 9d 260
- 4.14.79 STAG Set Tag 261
- 4.14.80 SUB Subtract 262
- 4.14.81 SUBB Subtract Byte 264
- SXM 1 1 N/R 9d 267
- 4.14.84 VCALL Vectored Call 268
- 4.14.85 XOR Logical XOR 269
- 4.14.86 XORB Logical XOR Byte 271
- 4.14.88 ZAC Zero Accumulator 273
- 4.15 Instruction Set Encoding 275
- Instruction Set Encoding 276
- 4.16 Instruction Set Summary 284
- Instruction Set Summay 292
- Code Development Tools 297
- 5.1 Introduction 298
- Introduction 299
- 5-3Code Development Tools 299
- 5.2.2 Tools Definitions 301
- 5-7Code Development Tools 303
- 5.2.3 Documentation 304
- 5.3.1 System Requirements 304
- 5.3.2 Hardware Tools Setup 305
- 5.4 Assembler 307
- Assembler 308
- 5-13Code Development Tools 309
- 5-15Code Development Tools 311
- 5.5 C–– Compiler 312
- 5.5.2 Variable Types 313
- 5.5.3 External References 313
- 5.5.4 C– – Directives 314
- 5.5.5 Include Files 315
- 5.5.7 Initializations 317
- 5.5.8 RAM Usage 317
- 5.5.9 String Functions 318
- Table 5–1. String Functions 318
- 5.5.10 Constant Functions 319
- 5.6 Implementation Details 320
- 5.6.2 Division 322
- 5.6.3 Function Calls 322
- 5.6.4 Programming Example 323
- Implementation Details 324
- 5-29Code Development Tools 325
- 5-31Code Development Tools 327
- 5-33Code Development Tools 329
- 5-35Code Development Tools 331
- 5.7 C–– Efficiency 333
- C–– Efficiency 334
- 5.7.1 Real Time Clock Example 335
- Example 5–1. First Project 335
- 5-47Code Development Tools 343
- 5-53Code Development Tools 349
- Beware of Stack Corruption 353
- 5-57Code Development Tools 353
- Applications 355
- 6.1 Application Circuits 356
- Oscillator 357
- 6.2.1 File init.asm 359
- 6.3 TI-TALKS Example Code 362
- 6.4 RAM Overlay 363
- 6.4.2 RAM Overlay 364
- 6.4.4 Common Problems 365
- Customer Information 367
- 7.1 Mechanical Information 368
- Mechanical Information 369
- 7-3Customer Information 369
- 7-5Customer Information 371
- 7-7Customer Information 373
- 7.3 Speech Development Cycle 378
- 7.5 Ordering Information 380
- Additional Information 389
- A.1 Additional Information 390
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