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32182 Datasheet(PDF) 117 Page - Renesas Technology Corp |
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32182 Datasheet(HTML) 117 Page - Renesas Technology Corp |
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117 / 755 page  4 4-22 EIT 32182 Group User’s Manual (Rev.1.0) 4.13 Precautions on EIT 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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