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M37160MF Datasheet(PDF) 83 Page - Renesas Technology Corp |
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M37160MF Datasheet(HTML) 83 Page - Renesas Technology Corp |
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83 / 131 page  Rev.1.01 2003.11.13 page 83 of 130 M37160M8/MA/MF-XXXSP/FP,M37160EFSP/FP Fig.8.11.1 Sequence at Detecting Software Runaway Detection 8.11 SOFTWARE RUNAWAY DETECT FUNCTION This microcomputer has a function to decode undefined instructions to detect a software runaway. When an undefined op-code is input to the CPU as an instruction code during operation, the following processing is done. ➀ The CPU generates an undefined instruction decoding signal. ➁ The device is internally reset due to the undefined instruction de- coding signal. ➂ As a result of internal reset, the same reset processing as in the case of ordinary reset operation is done, and the program restarts from the reset vector. Note, however, that the software runaway detecting function cannot be disalbed. ADH, ADL 01,S–2 01,S–1 PCH PCL PSADH ADL PC ? ? : Undefined instruction decode ? Undefined instruction decoding signal occurs.Internal reset signal occurs. φ SYNC Address Data Reset sequence 01,SFFFE16 FFFF16 : Invalid : Program counter S : Stack pointer PC ADL, ADH : Jump destination address of reset |
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