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Types of Addressing modes

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  Implied / Implicit Addressing Mode Stack Addressing Mode Immediate Addressing Mode Direct Addressing Mode Indirect Addressing Mode Register Direct Addressing Mode Register Indirect Addressing Mode Relative Addressing Mode Indexed Addressing Mode Base Register Addressing Mode Auto-Increment Addressing Mode Auto-Decrement Addressing Mode 1. Implied Addressing Mode-   In this addressing mode, The definition of the instruction itself specify the operands implicitly. It is also called as  implicit addressing mode .   Examples-   The instruction “Complement Accumulator” is an implied mode instruction. In a stack organized computer, Zero Address Instructions are implied mode instructions. (since operands are always implied to be present on the top of the stack)   2. Stack Addressing Mode-   In this addressing mode, The operand is contained at the top of the stack.   Example-   ADD This instruction simply pops out two symbols contained at the top o...
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General Register Organization

  A set of flip-flops forms a register. A register is a unique high-speed storage area in the CPU. They include combinational circuits that implement data processing. The information is always defined in a register before processing. The registers speed up the implementation of programs. Registers implement two important functions in the CPU operation are as follows − It can support a temporary storage location for data. This supports the directly implementing programs to have fast access to the data if required. It can save the status of the CPU and data about the directly implementing program. Example  − Address of the next program instruction, signals get from the external devices and error messages, and including different data is saved in the registers. The CPU bus system is managed by the control unit. The control unit explicit the data flow through the ALU by choosing the function of the ALU and components of the system. Consider R1 ← R2 + R3, the following are the func...
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Tokens in C

  Character Set of C The C Character Set Character set is set of valid characters that a language can recognise. A character represents any letter, digit, or any other sign that can be used in a program. C ategory Character Set Lowercase & Uppercase Letters a-z, A to Z Digits 0-9 Special Characters ,.;:`?!&^*-+<>()|\~-$?[]()%#=@ White Spaces Tab, space, newline Tokens In C A token is the smallest element of a program that is meaningful to the compiler. Tokens can be classified as follows: Keywords Identifiers Constants Strings Special Symbols Operators Keyword Keywords are pre-defined or reserved words in a programming language. Each keyword is meant to perform a specific function in a program. Since keywords are referred names for a compiler, they can’t be used as variable names because by doing so, we are trying to assign a new meaning to the keyword which is not allowed. You cannot redefine keywords. C language supports 32 keywords which are given below: auto else ...
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