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M37151M6 Datasheet(PDF) 91 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 91 Page - Renesas Technology Corp |
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91 / 138 page  M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 91 of 136 REJ03B0129-0100Z Fig.8.12.1 Sequence at Detecting Software Runaway Detection 8.12 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 disabled. ADH, ADL 01,S–2 01,S–1 PCH PCL PS ADH ADL PC ? ? : Undefined instruction decode ? Undefined instruction decoding signal occurs.Internal reset signal occurs. φ SYNC Address Data Reset sequence 01,S FFFE16 FFFF16 : Invalid : Program counter S : Stack pointer PC ADL, ADH : Jump destination address of reset |
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