Changeset 553


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Timestamp:
Feb 17, 2011, 1:37:42 PM (6 years ago)
Author:
sacerdot
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  • Deliverables/D4.1/ITP-Paper/itp-2011.tex

    r552 r553  
    181181Memory may be addressed in numerous ways: immediate, direct, indirect, external direct and code indirect.
    182182As the latter two addressing modes hint, there are some restrictions enforced by the 8051 and its derivatives on which addressing modes may be used with specific types of memory.
    183 For instance, the 128 bytes of extra internal RAM that the 8052 features cannot be addressed using indirect addressing; rather, external (in)direct addressing must be used.
     183For instance, the 128 bytes of extra internal RAM that the 8052 features cannot be addressed using indirect addressing; rather, external (in)direct addressing must be used. Moreover, some memory segments are addressed using 8 bits pointers while others require 16 bits.
    184184
    185185The 8051 series possesses an eight bit Arithmetic and Logic Unit (ALU), with a wide variety of instructions for performing arithmetic and logical operations on bits and integers.
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