參數(shù)資料
型號： M32180F8VFP
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 64 MHz, RISC MICROCONTROLLER, PQFP240
封裝： 32 X 32 MM, 0.50 MM PITCH, PLASTIC, QFP-240
文件頁數(shù)： 11/139頁
文件大小： 3774K
代理商： M32180F8VFP
4
4-19
EIT
32180 Group User’s Manual (Rev.1.0)
4.10 Trap Processing
(4) Branching to the EIT vector entry
The CPU branches to the addresses H’0000 0040–H’0000 007C in the user space. This is the last operation
performed in hardware preprocessing.
(5) Jumping from the EIT vector entry to the user-created handler
The CPU executes the BRA instruction written by the user at the addresses H’0000 0040–H’0000 007C of
the EIT vector entry to jump to the start address of the user-created handler. At the beginning of the user-
created EIT handler, first save the BPC and PSW registers and the necessary general-purpose registers to
the stack.
(6) Returning from the EIT handler
At the end of the EIT handler, restore the general-purpose registers and the BPC and PSW registers from
the stack and execute the RTE instruction. When the RTE instruction is executed, hardware postprocessing
is automatically performed. At this time, the CPU restarts from the next word-boundary instruction including
the instruction that generates a trap (see Figure 4.10.1).
4.11 EIT Priority Levels
The table below lists the priority levels of EIT events. When two or more EITs occur simultaneously, the event with
the highest priority is accepted first.
Table 4.11.1 Priority of EIT Events and How Returned from EIT
Priority
EIT Event
Type of Processing
Values Set in BPC Register
1 (Highest)
Reset Interrupt (RI)
Instruction processing-aborted type
Undefined
2
Address Exception (AE)
Instruction processing-canceled type
PC of the instruction that
generated AE
Reserved Instruction
Instruction processing-canceled type
PC of the instruction that
Exception (RIE)
generated AE
Floating-Point Exception
Instruction processing-completed type
PC of the instruction that
(FPE)
generated FPE + 4
Trap (TRAP)
Instruction processing-completed type
TRAP instruction + 4
3
System Break Interrupt
Instruction processing-completed type
PC of the next instruction
(SBI)
4
External Interrupt (EI)
Instruction processing-completed type
PC of the next instruction
Note that for External Interrupt (EI), the priority levels of interrupt requests from each peripheral I/O are set by the
microcomputer’s internal interrupt controller. For details, see Chapter 5, “Interrupt Controller.”
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