4
4-20
Ver.0.10
4.10 Trap Processing
4.10.1 Trap (TRAP)
[Occurrence Conditions]
Traps refer to software interrupts which are generated by executing the "TRAP" instruction.
Sixteen distinct traps are generated, each corresponding to one of "TRAP" instruction operands
0-15. Accordingly, sixteen vector entries are provided.
[EIT Processing]
(1) Saving SM, IE, and C bits
The SM, IE, and C bits of the PSW register are saved to their backup bits – the BSM, BIE,
and BC bits.
BSM
←
SM
BIE
←
IE
BC
←
C
(2) Updating SM, IE, and C bits
The SM, IE, and C bits of the PSW register are updated as shown below.
Unchanged
SM
←
0
IE
←
0
C
←
0
(3) Saving PC
When the trap instruction is executed, the "PC value of the TRAP instr 4" is set in
the BPC register. For example, if the "TRAP" instruction is located at address 4, the value
H'08 is set in the BPC register. Similarly, if the instruction is located at address 6, the value
H'0A is set in the BPC register. In this case, the value of the BPC register bit 30 indicates
whether the trap instruction resides on a word boundary (BPC[30] = 0) or not on a word
boundary (BPC[30] = 1).
However, in either case of the above, the address to which the "RTE" instruction returns
after completion of processing by the EIT handler is address 8. (This is because the two
low-order bits are cleared to "00" when returning to the PC.)
Normally, when the program has been written in assembler, the halfword that immediately
follows the "TRAP" instruction placed at a word boundary has the "NOP" instruction
automatically inserted by the assembler.
EIT
4.10 Trap Processing
Содержание M32170F3VFP
Страница 19: ...CHAPTER 1 CHAPTER 1 OVERVIEW 1 1 Outline of the 32170 1 2 Block Diagram 1 3 Pin Function 1 4 Pin Layout ...
Страница 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Страница 56: ...2 2 14 Ver 0 10 This is a blank page ...
Страница 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Страница 192: ...6 6 58 Ver 0 10 INTERNAL MEMORY 6 9 Precautions to Be Taken When Rewriting Flash Memory This is a blank page ...
Страница 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Страница 498: ...10 10 228 Ver 0 10 MULTIJUNCTION TIMERS 10 9 TOM Output related 16 bit Timer This is a blank page ...
Страница 550: ...11 11 52 Ver 0 10 A D CONVERTERS 11 4 Precautions on Using A D Converters This is a blank page ...
Страница 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Страница 710: ...14 14 16 Ver 0 10 REAL TIME DEBUGGER RTD 14 4 Typical Connection with the Host This is a blank page ...
Страница 746: ...16 16 20 Ver 0 10 WAIT CONTROLLER 16 3 Typical Operation of the Wait Controller This is a blank page ...
Страница 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Страница 757: ...CHAPTER 18 CHAPTER 18 OSCILLATION CIRCUIT 18 1 Oscillator Circuit 18 2 Clock Generator Circuit ...
Страница 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Страница 798: ...19 19 36 Ver 0 10 JTAG 19 6 Precautions about Board Design when Connecting JTAG This is a blank page ...
Страница 830: ...21 21 24 Ver 0 10 PRELIMINARY PRELIMINARY This is a blank page ELECTRICAL CHARACTERISTICS 21 5 AC Characteristics ...
Страница 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Страница 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Страница 837: ...Appendix 2 1 32170 Instruction Processing Time APPENDIX 2 APPENDIX 2 INSTRUCTION PROCESSING TIME ...
Страница 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...