參數(shù)資料
型號: μPD70F3003
廠商: NEC Corp.
英文描述: 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
中文描述: 16/32位單片機微控制器(16/32位單片微控制器)
文件頁數(shù): 105/141頁
文件大?。?/td> 374K
代理商: ΜPD70F3003
CHAPTER 6 INTERRUPT AND EXCEPTION
Interrupts are events that occur independently of the program execution and are divided into two types: maskable
and non-maskable interrupts. In contrast, an exception is an event whose occurrence is dependent on the program
execution. There is no major difference between the interrupt and exception in terms of control flow. However, the
interrupt takes precedence over the exception.
The V850 can process various interrupt requests from the on-chip peripheral hardware and external sources. In
addition, exception processing can be started by an instruction (TRAP instruction) and by occurrence of an exception
event (exception trap).
The interrupts and exceptions supported in the V850 family are described below. When an interrupt or exception
is deleted, control is transferred to a handler whose address is determined by the source of the interrupt or exception.
The source of the event is specified by the exception code that is stored in the exception cause register (ECR). Each
handler analyzes the exception cause register (ECR) and performs appropriate interrupt servicing or exception
handling. The return PC and PSW are written to the status saving registers (EIPC, EIPSW/FEPC, FEPSW).
To return execution from interrupt or exception processing, use the RETI instruction.
Read the return PC and PSW from the status saving register, and transfer control to the return PC.
Types of interrupt/exception processing
The V850 family handles the following four types of interrupts/exceptions:
Non-maskable interrupt
Maskable interrupt
Software exception
Exception trap
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