CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U13850EJ4V0UM
147
5.4.2 Restore
To restore or return execution from the software exception service routine, the RETI instruction is used.
Operation of RETI instruction
When the RETI instruction is executed, the CPU performs the following steps, and transfers control to the address
of the restored PC.
(1) Restores the restored PC and PSW from EIPC and EIPSW because the EP bit of PSW is 1.
(2) Transfers control to the address of the restored PC and PSW.
The processing of the RETI instruction is shown below.
Figure 5-17. RETI Instruction Processing
PSW.EP
RETI instruction
PC
PSW
EIPC
EIPSW
PSW.NP
Original processing restored
PC
PSW
FEPC
FEPSW
1
1
0
0
Caution When the PSW.EP bit and the PSW.NP bit are changed by the LDSR instruction during the
software exception process, in order to restore the PC and PSW correctly during recovery by the
RETI instruction, it is necessary to set PSW.EP back to 1 using the LDSR instruction immediately
before the RETI instruction.
Remark
The solid line shows the CPU processing flow.
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