參數(shù)資料
型號: M34506M4-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, MICROCONTROLLER, PDSO20
封裝: 5.30 X 12.60 MM, 1.27 MM PITCH, PLASTIC, SOP-20
文件頁數(shù): 15/114頁
文件大?。?/td> 836K
代理商: M34506M4-XXXFP
4
4-22
EIT
32180 Group User’s Manual (Rev.1.0)
4.13 Precautions on EIT
The Address Exception (AE) requires caution because if one of the instructions that use “register indirect + register
update” addressing mode (following three) generates an address exception when it is executed, the values of the
registers to be automatically updated (Rsrc and Rsrc2) become undefined.
Except that the values of Rsrc and Rsrc2 become undefined, these instructions behave the same way as when
used in other addressing modes.
Applicable instructions
LD
Rdest, @Rsrc+
ST
Rsrc1, @-Rsrc2
ST
Rsrc1, @+Rsrc2
If the above case applies, consider the fact that the register values become undefined when you design the processing
to be performed after executing said instructions. (If an address exception occurs, it means that the system has some
fatal fault already existing in it. Therefore, address exceptions must be used on condition that control will not be returned
from the address exception handler to the program that was being executed when the exception occurred.)
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