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): 108/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
CHAPTER 6 INTERRUPT AND EXCEPTION
96
6.1.2 Non-maskable interrupt
The non-maskable interrupt cannot be disabled by an instruction and therefore can be always accepted. The non-
maskable interrupt of the V850 family is generated by the NMI input.
When the non-maskable interrupt is generated by the NMI input, the processor performs the following steps, and
transfers control to the handler routine.
(1) Saves restore PC to FEPC.
(2) Saves current PSW to FEPSW.
(3) Writes exception code to higher half-word of ECR (FECC).
(4) Sets NP and ID bits of PSW and clears EP bit.
(5) Sets handler address (00000010H) for the non-maskable interrupt to PC and transfers control.
Non-maskable interrupts are held pending in the INTC when other non-maskable interrupt is currently being
executed (when the NP bit of the PSW is 1). Non-maskable interrupts are enabled by resetting the NP bit of the PSW
to 0 with the RETI and LDSR instructions, which will be enabling servicing of a new or already pending interrupt.
The FEPC and FEPSW are used as the status saving registers.
Figure 6-2 illustrates how the non-maskable interrupt is serviced.
Figure 6-2. Non-maskable Interrupt Servicing Format
PSW.NP
FEPC
FEPSW
ECR.FECC
PSW.NP
PSW.EP
PSW.ID
PC
Restore PC
PSW
Exception Code
1
0
1
00000010H
1
0
Non-Maskable
Interrupt (NMI) Occurs
Interrupt Servicing Pending
Interrupt Servicing
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