Hi twelvexs, Yes, the mode control is via MDx. But what I'm referring to is the security mode pins. There exist two EPROM programming modes; Normal and Security. The Normal programming mode allows the user to program the code/data area of the on-chip memory of the device. The Security programming mode allows the user to program the security bits, thus implementing the security feature. If the security bit is a ‘0’ (programmed state), then any read operation to the EPROM will result in a ‘00’ being read. For H8/3048, the NORMAL mode is P50=1 P51=1, while the security mode is P50=1 P51=0
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