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instruction format of 8086 with examples
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well , coming to the point, as we know that all the instructions are converted into the binary format right.now, for example,if we consider an hexadecimal number,it occupies 8 bits or 1 byte of space, if we have a combination of more number of such numbers, then the combine size of the instruction converted
Feb 10, 2015 In this mode operand is a part of the instruction itself is known as Immediate Addressing mode. If the immediate data is 8-bit, the instruction will be of two bytes. If the immediate data is 16 bit, the instruction is of 3 bytes. Ex: (1). ADI DATA ; Add immediate the data to the contents of the accumulator. (2).
1. Instruction Formats. One address. Two address. Zero address. Three addresses and comparison. 2. Addressing modes with numeric examples. 3. Program control. Status bit conditions. A program is written for the computer to check the flag in the status register to determine if a byte has been placed in the data register
Sometimes the operand is implicit in the opcode (that is included in the opcode itself). Now depending on the word size the instructions of the 8085 microprocessor are classified into three categories: 1-byte, 2-byte, and 3-byte instructions. Data specified through register A (implicit in CMA).
Apr 7, 2013 Each instruction has two parts: one is the task to be performed called the operation code (opcode) and the other is the data to be operated on called the operand (data). Instruction And Word Size. 1. One word or one byte Instruction. It includes the opcode and operand in the same byte. Example: ADD B
ARITHMETIC INSTRUCTIONS. Mnemonic, Description, Byte, Cycle. ADD A,Rn, Adds the register to the accumulator, 1, 1. ADD A,direct, Adds the direct byte to the accumulator, 2, 2. ADD A,@Ri, Adds the indirect RAM to the accumulator, 1, 2. ADD A,#data, Adds the immediate data to the accumulator, 2, 2. ADDC A,Rn
ADD is either a one-byte or a two-byte instruction, depending on what's getting added to what. If you're adding a constant, or the value at an arbitrary address, then ADD is a two-byte instruction. It's only a one-byte instruction if there are enough bits in the opcode besides those indicating ADD to indicate
For example, in all of the above instructions, the size of the memory regions could be inferred from the size of the register operand. When we were loading a 32-bit register, the assembler could infer that the region of memory we were referring to was 4 bytes wide. When we were storing the value of a one byte register to
Although Intel instructions vary in size from one byte up to fourteen bytes, all Intel instructions have the same six-part structure. For example, when OR is used with the accumulator register (AX or EAX) and a constant, it has the special space-saving opcode 0000110w, which eliminates the need for a separate ModR/M
a) One byte Instruction : This format is only one byte long and may have the implied data or register operands. The first byte of the code specifies the operation code and the width of the operand specifies by w bit. The second byte of the opcode shows the register operands and RIM field.
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