參數(shù)資料
型號: M32000D3FP
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 66.6 MHz, RISC MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-100
文件頁數(shù): 91/155頁
文件大?。?/td> 1340K
代理商: M32000D3FP
4-4
M32000D3FP User's Manual
EIT
4.3 EIT processing procedure
Part of EIT processing is automatically executed by hardware and part is executed by software (EIT handler)
programmed by the user. Except for the reset interrupt and the wakeup interrupt, processing procedures
when accepting the EIT event are as follows.
When the EIT is accepted, the M32000D3FP carries out hardware pre-processing and then branches to the
EIT vector. A vector address allocated for each EIT in the EIT vector. This is where branch instructions to
the EIT handlers are stored. (Note that these are not branch addresses.)
In hardware pre-processing, the PC contents are saved in the backup PC (BPC) and the PSW field of the
PSW register are saved in the BPSW field of the same register (see Table 4.5.1).
The user should save the BPC and the PSW register (the BPSW field included), and general-purpose
registers to be used by the EIT handler in the stack. (Saving to the stack is the responsibility of the user
program.).
On the completion of execution of the EIT handler, the registers saved in the stack should be restored and
then the RTE instruction should be executed. Control of the EIT process changes to hardware post-processing,
which returns control to the original program (except occurrence of the SBI). In hardware post-processing,
the BPC value is restored to the PC and the BPSW field of the PSW register to the PSW field in the same
register.
After executing the RTE instruction, the values of the BPC and the BPSW field of the PSW register are
undefined.
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