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): 110/141頁
文件大小: 374K
代理商: ΜPD703008
CHAPTER 6 INTERRUPT AND EXCEPTION
98
6.2.2 Exception trap
The exception trap is an interrupt requested when an instruction is illegally executed. The exception trap of the
V850 family is generated by an illegal op code instruction code trap (ILGOP: ILleGal OPcode trap).
An illegal op code instruction has an instruction code with an op code (bits 5 through 10) of 111111B and a sub-
op code (bits 23 through 26) of 0011B through 1111B. When this kind of an illegal op code instruction is executed,
an illegal op code instruction code trap occurs.
Figure 6-4. Illegal Instruction Code
Remark
×
: don’t care
: Op code/sub-op code portion
If an exception trap occurs, the CPU performs the following steps, and transfers control to the handler routine.
(1) Saves restore PC to EIPC.
(2) Saves current PSW to EIPSW.
(3) Writes exception code to lower 16 bits (EICC) of ECR.
(4) Sets EP and ID bits of PSW.
(5) Sets handler address (00000060H) for exception trap to PC and transfers control.
Figure 6-5 illustrates how the exception trap is processed.
Figure 6-5. Exception Trap Processing Format
The execution address of the illegal instruction is obtained by “restore PC - 4” when an exception trap occurs.
Caution In addition to the defined op codes and illegal op codes, there is a range of codes not recognized
by this processor. If an instruction corresponding to these codes is executed, normal operation
is undetermined.
EIPC
EIPSW
ECR.EICC
PSW.EP
PSW.ID
PC
Restore PC
PSW
Exception code
1
1
00000060H
Exception Trap
(ILGOP) Occurs
Exception Processing
× × ×
× ×
×
× ×
× × ×
× ×
× ×
0
0
1
1
1
1
1
1
× × × ×
× × ×
15
13 12 11 10
5
4
0 31
27 26
23 22 21 20
17 16
1
1
1
1
1
1
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