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PROGRAMMER'S MODEL OF 8086

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The programming model for a microprocessor shows the various internal registers that are accessible to the programmer.   The Following Figure is a model for the 8086. In general, each register has a special function. In the programming model there are -           4 General Purpose registers( Data Registers) -           4 Segment registers -           2 Pointer registers -           2 Index registers -           1 Instruction Pointer register -           1 Flag register General purpose registers: AX Register (Accumulator):  This is accumulator register. It gets used in arithmetic, logic and data transfer instructions. In manipulation and division, one of the numbers involved must be in AX...
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8085

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    1.      What is Stack? Explain about stack in 8085. ·        The stack is a group of memory location in the R/W memory that is used for temporary storage of binary information during the execution of a program ·        The stack is a LIFO structure. – Last In First Out. ·        The starting location of the stack is defined by loading a 16 bit address into the stack pointer that spaced is reserved, usually at the top of the memory map   Stack in 8085   ·        In 8085 microprocessor system the beginning of the stack is defined in the program by using the instruction   LXI SP,<16 bit> ·        The 8085 provide two instruction PUSH & POP for storing information on the stack and retrieving it back. PUSH   <Reg Pair>     :    Sto...
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Addressing Modes of 8051

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  ADDRESSING MODES OF 8051   Ans: Various methods of accessing the data are called addressing modes. 8051 addressing modes are classified as follows.                     i.             Immediate addressing. -           In this addressing mode the data is provided as a part of instruction itself. -           In other words data immediately follows the instruction. Eg. MOV A,#30H ADD A, #83                  ii.             Register addressing. -           In this addressing mode the register will hold the data. -   ...
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