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Start with SAP(Simple As Possible) computer. It has three versions SAP-1, SAP-2 and SAP-3. Read it form Digital Computer Electronics by Malvino and Brown. SAP will help you in understanding basics of processor architecture. than you can go for 8085 or 8086, 80286, 80386 and so on..
1. Digital Computer Electronics by Malvino and Brown.
2. Microprocessors and interfacing: programming and hardware by Douglas V. Hall
3. Computer architecture: a quantitative approach by John L. Hennessy, David A. Patterson