4
4-11
Rev.1.0
EIT
4.8 Exception Handling
4.8 Exception Handling
4.8.1 Reserved Instruction Exception (RIE)
[Occurrence condition]
A Reserved Instruction Exception (RIE) occurs when execution of a reserved instruction (an
unimplemented instruction) is detected. Instruction check is performed on the op-code part of the
instruction.
When a Reserved Instruction Exception occurs, the instruction that caused the exception is not
executed. Even if an external interrupt is requested when a Reserved Instruction Exception is
detected, the Reserved Instruction Exception is accepted.
[EIT processing]
(1) Saving the SM, IE, and C bits
The PSW Register SM, IE, and C bits are saved to the backup bits-BSM, BIE, and BC.
BSM
←
SM
BIE
←
IE
BC
←
C
(2) Updating the SM, IE, and C bits
The PSW Registmer SM, IE, and C bits are updated in the manner shown below.
SM
←
Unchanged
IE
←
0
C
←
0
(3) Saving the PC
The PC value of the instruction that caused the Reserved Instruction Exception is set in
the BPC Register. For example, if the instruction that caused the Reserved Instruction
Exception is at address 4, then the value 4 is set in the BPC Register; if at address 6, then
the value 6 is set in the BPC Register. In this case, the value of the BPC Register bit 30
indicates whether the instruction that caused the Reserved Instruction Exception exists
on the word boundary (BPC[30] = 0), or not (BPC[30] = 1).
However, in either case of the above, the location to which the RTE instruction returns
after the end of the EIT handler is always address 4. (This is because the two low-order
bits are cleared to '00' when returning to the PC.)
Содержание 32172
Страница 20: ... This is a blank page 16 ...
Страница 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Страница 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Страница 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Страница 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Страница 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Страница 240: ...8 8 40 Rev 1 0 This is a blank page INPUT OUTPUT PORTS AND PIN FUNCTIONS 8 5 Precautions on Input Output Ports ...
Страница 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Страница 416: ...10 10 118 Rev 1 0 This is a blank page INPUT OUTPUT TIMERS 10 6 TOM Output Related 16 bit Timers ...
Страница 658: ...14 14 16 Rev 1 0 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 718: ...16 16 16 Rev 1 0 This is a blank page D A CONVERTERS 16 3 Functional Description of the D A Converters ...
Страница 766: ...18 18 22 Rev 1 0 WAIT CONTROLLER 18 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 777: ...CHAPTER 20 CHAPTER 20 OSCILLATION CIRCUIT 20 1 Oscillator Circuit 20 2 Clock Generator Circuit ...
Страница 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Страница 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Страница 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Страница 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 861: ...Appendix 2 1 M32R E Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...