[question] ARM7TDMI's trouble

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Hi, All,   I have 2 questions:   (1). Could somebody tell me what's different for SYSTEM mode and SUPERVISOR mode for ARM7TDMI? (2). Does ARM7TDMI mplement a hardware mechanism to detect memory violation?        I mean if I have  a program that run in user mode nad the program try to access the system mode's data.        Can hardware tell me memory violation? Or I must have a mechanism in software to access the violation? Thanks!!