4
4-8
Ver.0.10
4.6 Saving and Restoring the PC and PSW
The following describes operation of the M32R at the time when it accepts an EIT and when it
executes the "RTE" instruction.
(1) Hardware preprocessing when an EIT is accepted
➀
Save the SM, IE, and C bits of the PSW register
BSM
←
SM
BIE
←
IE
BC
←
C
➁
Update the SM, IE, and C bits of the PSW register
SM
←
Remains unchanged (RIE, AE, TRAP)
or set to 0 (SBI, EI, RI)
IE
←
Set to 0
C
←
Set to 0
➂
Save the PC register
BPC
←
PC
➃
Set the vector address in the PC register
Branches to the EIT vector and executes the branch instruction ("BRA" instruction) written
in it, thereby transferring control to the user-created EIT handler.
(2) Hardware postprocessing when the "RTE" instruction is executed
❶
Restore the SM, IE, and C bits of the PSW register from their backup bits.
SM
←
BSM
IE
←
BIE
C
←
BC
❷
Restore the value of the PC register from the BPC register
PC
←
BPC
Note: The value of the BPC register and those of the BSM, BIE, and BC bits of the PSW register
after execution of the "RTE" instruction are indeterminate.
EIT
4.6 Saving and Restoring the PC and PSW
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...