CHAPTER 5 INTERRUPT/EXCEPTION PROCESSING FUNCTION
User’s Manual U13850EJ4V0UM
130
5.2.2 Restore
Execution is restored from non-maskable interrupt servicing by the RETI instruction.
Operation of RETI instruction
When the RETI instruction is executed, the CPU performs the following processing, and transfers control to the
address of the restored PC.
(1) Restores the values of PC and PSW from FEPC and FEPSW, respectively, because the EP bit of PSW is 0
and the NP bit of PSW is 1.
(2) Transfers control back to the address of the restored PC and PSW.
How the RETI instruction is processed is shown below.
Figure 5-3. 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 PSW.NP bit are changed by the LDSR instruction during the non-
maskable interrupt service, in order to restore the PC and PSW correctly during recovery by the
RETI instruction, it is necessary to set PSW.EP back to 0 and PSW.NP back to 1 using the LDSR
instruction immediately before the RETI instruction.
Remark
The solid line shows the CPU processing flow.
Содержание MPD703030A
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