Shift and rotate instructions in 8086 pdf

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ROTATE is a logical operation of the 8085 microprocessor. It is a 1-byte instruction. This instruction does not require any operand after the opcode. It operates the content of the accumulator and the result is also stored in the accumulator. The Rotate instruction is used to rotate the bits of accumulator. Types of ROTATE Instruction: There Feature of 8086 Microprocessor •- 8086 is a 16bit processor. It's ALU, internal registers works with 16bit binary word •- 8086 has a 16bit data bus. It can read or write data to a memory/port either 16bits or 8 bit at a manipulation and shift/rotate instructions. Arithmetic, Logic and Bit Manipulation Instructions 1. Addition instructions ADD, ADC, and INC, 2. Subtraction instructions SUB, SBB, DEC, and NEG 3. Multiplication instructions MUL and IMUL 4. Division instructions DIV, IDIV, CBW, and CWD 5. Logic instructions AND, OR, XOR, NOT, and TEST 6. Shift and rotate instructions SHL, SHR, ROL, ROR, RCL, and (bit manipulation) RCR Microprocessors Adnan Hadeel N Abdullah. University of Technology, Iraq. Content uploaded by Hadeel N Abdullah. 26677897 8086 Instruction Set Ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Scribd is the world's largest social reading and publishing site. Shift and Rotate Instructions SHR/SAL: Shift and Rotate Instructions • Shifting means to move bits right and left inside an operand. • All of the Shift and Rotate instructions affect Overflow and Carry Flags. • The Shift and Rotate instructions include: SHL-Shift Left ROL- Rotate Left SHR-Shift Right ROR- Rotate Right SAL- Shift Arithmetic Left RCL-Rotate Carry Left Instructions in Microprocessor 8086/8088 Upon completion of this chapter, you will be able to: Use arithmetic and logic instructions to accomplish simple binary, BCD, and ASCII arithmetic. Use AND, OR, and Exclusive-OR to accomplish binary bit manipulation. Use the shift and rotate instructions. SHR −Used to shift bits of a byte/word towards the right and put zero(S) in MSBs. SAR −Used to shift bits of a byte/word towards the right and copy the old MSB into the new MSB. Instructions to perform rotate operations ROL −Used to rotate bits of byte/word towards the left, i.e. MSB to LSB and to Carry Flag [CF]. INSTRUCTION SET OF 8086 Instructions 8086 are classified into the following basic types. 1. Copy data / Transfer instructions 2. Arithmetic and logical instructions 3. Shift and turn instructions 4. Instructions on Loop 5. Branch Instructions 6. Instructions on strings 7. Instructions for manipulating the flag 8. instructions make assembly language programming easier, but you do not need to know them to begin writing programs. 80x86 instructions can be (roughly) divided into eight different classes: Logical, shift, rotate, and bit instructions • and, or, xor, not, shl, shr, rcl, rcr 5) I/O instructions • in, out 6) String instructions • movs •8086 instructions are encoded as binary numbers •Instructions vary in length from 1 to 6 bytes •The d position is interpreted as the "c" bit in Shift and Rotate instruction