參數(shù)資料
型號: μPD703008
廠商: NEC Corp.
英文描述: 16/32 Bit RISC Microcontrollers(16/32位RISC微控制器)
中文描述: 16/32位RISC微控制器(16/32位的RISC微控制器)
文件頁數(shù): 76/141頁
文件大小: 374K
代理商: ΜPD703008
CHAPTER 5 INSTRUCTION
64
RETI
Return from Trap or Interrupt
Instruction format
RETI
Operation
if PSW.EP = 1
then PC
PSW
EIPSW
else if PSW.NP = 1
then PC
EIPC
FEPC
PSW
FEPSW
else PC
PSW
EIPSW
EIPC
Format
Format X
Op code
15
0 31
16
0000011111100000 0000000101000000
Flag
CY
OV
S
Z
SAT
Value read from FEPSW or EIPSW is restored.
Value read from FEPSW or EIPSW is restored.
Value read from FEPSW or EIPSW is restored.
Value read from FEPSW or EIPSW is restored.
Value read from FEPSW or EIPSW is restored.
Instruction
RETI Return from Trap or Interrupt
Explanation
This instruction restores the return PC and PSW from the appropriate system register and
returns from an exception or interrupt routine. The operations of this instruction are as follows:
(1) If the EP flag of the PSW is 1, the return PC and PSW are read from the EIPC and EIPSW,
regardless of the status of the NP flag of the PSW.
If the EP flag of the PSW is 0 and the NP flag of the PSW is 1, the return PC and PSW
are read from the FEPC and FEPSW.
If the EP flag of the PSW is 0 and the NP flag of the PSW is 0, the return PC and PSW
are read from the EIPC and EIPSW.
(2) Once the PC and PSW are restored to the return values, control is transferred to the return
address.
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