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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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7220 Scheda tecnica(PDF) 117 Page - Renesas Technology Corp |
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7220 Scheda tecnica(HTML) 117 Page - Renesas Technology Corp |
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117 / 303 page  2-90 7220 Group User’s Manual FUNCTIONAL DESCRIPTION 2.13 Software runaway detect function Fig. 2.13.1 Sequence at detecting software runaway detection 2.13 Software runaway detect function The M37221M6-XXXSP/FP 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 of the M37221M6- XXXSP/FP, the following processing is done. The CPU generates an undefined instruction decoding signal. The device is internally reset because of occurrence of the undefined instruction decoding signal. 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 invalid. 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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