參數(shù)資料
型號(hào): 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): 6/139頁
文件大?。?/td> 3774K
代理商: M32180F8VFP
4
4-14
EIT
32180 Group User’s Manual (Rev.1.0)
(3) Saving the PC
The PC value of the instruction that generated the FPE exception + 4 is set in the BPC register.
Because all of the instructions that generate an FPE exception are 32 bits long, the address to which the
RTE returns is always the instruction next to the one that generated the FPE exception.
(4) Branching to the EIT vector entry
The CPU branches to the address H’0000 0090 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 address H’0000 0090 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, PSW and FPSR 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 saved registers from the stack and execute the RTE instruction.
When the RTE instruction is executed, hardware postprocessing is automatically performed.
4.8 Exception Processing
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