4
4-13
Ver.0.10
4.8.2 Address Exception (AE)
[Occurrence Conditions]
Address Exception (AE) is generated when an attempt is made to access a misaligned address
in Load or Store instructions. The following lists the combination of instructions and accessed
addresses that may cause address exceptions to occur:
• When the LDH, LDUH, or STH instruction accesssed an address whose two low-order bits are
"01" or "11"
• When the LD, ST, LOCK, or UNLOCK instruction accessed an address whose two low-order
bits are "01," "10," or "11"
When an address exception occurs, memory access by the instruction that generated the
exception is not performed. If an external interrupt is requested at the same time an address
exception is detected, it is the address exception that is accepted.
[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.
SM
←
Unchanged
IE
←
0
C
←
0
(3) Saving PC
The PC value of the instruction that generated the address exception is set in the BPC
register. For example, if the instruction that generated the address exception is at address
4, the value 4 is set in the BPC register. Similarly, if the instruction is at address 6, 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 generated the address exception 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 4. (This is because the two
low-order bits are cleared to "00" when returning to the PC.)
EIT
4.8 Exception 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 ...