INSTRUCTION DESCRIPTIONS
A - 102
INSTRUCTION SET DETAILS
MOTOROLA
Operation:
Assembler Syntax:
Begin Illegal Instruction
ILLEGAL
exception processing
Description: The ILLEGAL instruction is executed as if it were a NOP instruction. Nor-
mal instruction execution is suspended and illegal instruction exception processing is ini-
tiated. The interrupt vector address is located at address P:$3E. The interrupt priority
level (I1, I0) is set to 3 in the status register if a long interrupt service routine is used. The
purpose of the ILLEGAL instruction is to force the DSP into an illegal instruction excep-
tion for test purposes. If a fast interrupt is used with the ILLEGAL instruction, an infinite
loop will be formed (an illegal instruction interrupt normally returns to the illegal instruc-
tion) which can only be broken by a hardware reset. Therefore, only long interrupts
should be used. Exiting an illegal instruction is a fatal error. The long exception routine
should indicate this condition and cause the system to be restarted.
If the ILLEGAL instruction is in a DO loop at LA and the instruction at LA–1 is being inter-
rupted, then LC will be decremented twice due to the same mechanism that causes LC
to be decremented twice if JSR, REP, etc. are located at LA. This is why JSR, REP, etc.
at LA are restricted. Clearly restrictions cannot be imposed on illegal instructions.
Since REP is uninterruptable, repeating an ILLEGAL instruction results in the interrupt
not being initiated until after completion of the REP. After servicing the interrupt, program
control will return to the address of the second word following the ILLEGAL instruction.
Of course, the ILLEGAL interrupt service routine should abort further processing, and the
processor should be reinitialized.
Example:
:
ILLEGAL
;begin ILLEGAL exception processing
:
Explanation of Example: The ILLEGAL instruction suspends normal instruction execu-
tion and initiates ILLEGAL exception processing.
ILLEGAL
Illegal Instruction Interrupt
ILLEGAL
Содержание DSP56K
Страница 12: ...xii LIST of TABLES MOTOROLA List of Tables Continued Table Page Number Title Number ...
Страница 13: ...MOTOROLA DSP56K FAMILY INTRODUCTION 1 1 SECTION 1 DSP56K FAMILY INTRODUCTION ...
Страница 25: ...MOTOROLA DSP56K CENTRAL ARCHITECTURE OVERVIEW 2 1 SECTION 2 DSP56K CENTRAL ARCHITECTURE OVERVIEW ...
Страница 31: ...MOTOROLA DATA ARITHMETIC LOGIC UNIT 3 1 SECTION 3 DATA ARITHMETIC LOGIC UNIT ...
Страница 50: ...DATA ALU SUMMARY 3 20 DATA ARITHMETIC LOGIC UNIT MOTOROLA ...
Страница 51: ...MOTOROLA ADDRESS GENERATION UNIT 4 1 SECTION 4 ADDRESS GENERATION UNIT ...
Страница 77: ...MOTOROLA PROGRAM CONTROL UNIT 5 1 SECTION 5 PROGRAM CONTROL UNIT ...
Страница 124: ...INSTRUCTION GROUPS 6 30 INSTRUCTION SET INTRODUCTION MOTOROLA ...
Страница 125: ...MOTOROLA PROCESSING STATES 7 1 SECTION 7 PROCESSING STATES STOP WAIT EXCEPTION NORMAL RESET ...
Страница 167: ...STOP PROCESSING STATE MOTOROLA PROCESSING STATES 7 43 ...
Страница 168: ...STOP PROCESSING STATE 7 44 PROCESSING STATES MOTOROLA ...
Страница 169: ...MOTOROLA PORT A 8 1 SECTION 8 PORT A ...
Страница 176: ...PORT A INTERFACE 8 8 PORT A MOTOROLA ...
Страница 177: ...MOTOROLA PLL CLOCK OSCILLATOR 9 1 SECTION 9 PLL CLOCK OSCILLATOR x x d Φ VCO ...
Страница 191: ...10 2 ON CHIP EMULATION OnCE MOTOROLA SECTION 10 ON CHIP EMULATION OnCE ...
Страница 218: ...USING THE OnCE MOTOROLA ON CHIP EMULATION OnCE 10 29 ...
Страница 604: ...INSTRUCTION ENCODING A 338 INSTRUCTION SET DETAILS MOTOROLA ...
Страница 605: ...MOTOROLA BENCHMARK PROGRAMS B 1 APPENDIX B BENCHMARK PROGRAMS T T T T T P1 P3 P2 P4 T T T ...
Страница 606: ...SECTION CONTENTS B 2 BENCHMARK PROGRAMS MOTOROLA SECTION B 1 INTRODUCTION 3 SECTION B 2 BENCHMARK PROGRAMS 3 ...
Страница 609: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 5 ...
Страница 611: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 7 ...
Страница 613: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 9 ...
Страница 615: ...BENCHMARK PROGRAMS MOTOROLA BENCHMARK PROGRAMS B 11 ...