參數(shù)資料
型號(hào): 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): 109/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
97
CHAPTER 6 INTERRUPT AND EXCEPTION
6.2 Exception Processing
6.2.1 Software exception
A software exception is generated when the CPU executes the TRAP instruction and is always accepted.
If a software exception 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 (interrupt cause).
(4) Sets EP and ID bits of PSW.
(5) Sets handler address (00000040H or 00000050H) for software exception to PC and transfers control.
Figure 6-3 illustrates how the software exception is processed.
Figure 6-3. Software Exception Processing Format
Handler address: 00000040H (vector = 0nH)
00000050H (vector = 1nH)
EIPC
EIPSW
ECR.EICC
PSW.EP
PSW.ID
PC
Restore PC
PSW
Exception Code
1
1
Handler Address
Software
Exception (TRAP Instruction) Occurs
Exception Processing
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