PDF | On Mar 31, , Hadeel N Abdullah and others published Lecture 7: Instruction Set: String Instruction. Instruction Set of An instruction is a binary pattern designed inside a microprocessor to perform a specific function. The entire group of. This lecture describes a subset of the 80x86 architecture and instruction set. details of the 80x86 you should learn enough about the instruction set to be .
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Some instructions generate exactly the same machine code, so disassembler may have a problem decoding to your original code. This is especially important. instructions Page 1 of 53 Complete instruction set Quick reference: CMPSB MOV AAA CMPSW JAE JNBE JPO MOVSB RCR SCASB AAD CWD JB. x86, orijinal Intel ile ileriye dönük olarak uyumlu model numaralarından .. registers, index registers, instruction pointer, and FLAGS register, but not the.
Shift Arithmetic operand1 Right. This is the return RET instruction. Tarun Thadani. RET Interrupt Return. Sivanesh SK.
Complete instruction set. John Michael Esguerra. Chin Chao La Chua. For example: REG, memory z When there are two operands, both operands must have the same size except shift and rotate instructions. AL, m1 m2 DW? AX, m2 z Some instructions allow several operand combinations. RET These marks are used to show the state of the flags: Some instructions generate exactly the same machine code, so disassembler may have a problem decoding to your original code.
This is especially important for Conditional Jump instructions see "Program Flow Control" in Tutorials for more information. Instructions in alphabetical order: It works according to the following Algorithm: Prepares two BCD values for division.
Corrects the result of multiplication of two BCD values. ADC Algorithm: Result is stored in operand1.
These rules apply: SI and DI will be incremented by chain instructions: This disables hardware interrupts. Inverts value of CF. Corrects the result of addition of two packed BCD values. Corrects the result of subtraction of two packed BCD values. Halt the System. Signed multiply. REG Example: Input from port into AL or AX.
Second operand is a port number. If required to access port number over - DX register should be used. AL, im. IN AX, im. Interrupt numbered by immediate byte Push to stack: RET Interrupt Return.
Pop from stack: JBE label include 'emu PRINT 'has carry. Transfers control to another part of the program. JNC label include 'emu PRINT 'no carry. JNG label include 'emu JNO label include 'emu PRINT 'no overflow.
Only 8 low bits of result are checked. PRINT 'parity odd. PRINT 'not signed.
Requirement Then do this! Above and Below used for comparing Unsigned nos. Greater than and less than used with signed numbers. All Intel microprocessors use this convention. Direct Jump Indirect Jump common uncommon. Backward jump: Assembler knows the quantum of jump. Forward jump: Assembler reserves 3 bytes for the forward jump instruction. Programmer should ensure that the: Long Jump can CS: Too very a small 20H CS: Near Indirect Jump is uncommon.
Instruction length: It is a 5 byte instruction 1 byte opcode EAH 2 byte offset value 2 byte segment value. Instruction length depends on the way jump location is specified It can be a minimum of 2 bytes. Instruction length is a minimum of 2 bytes. It depends on the way jump location is specified. The will enter a halt state. NOP instruction this instruction simply takes up three clock cycles and does no processing.
After this, it will execute the next instruction. This instruction is normally used to provide delays in between instructions. ESC instruction whenever this instruction executes, the microprocessor does NOP or access a data from memory for coprocessor. This instruction passes the information to math processor.
Six bits of ESC instruction provide the opcode to coprocessor. The co-processor will treat normal instructions as NOP. Floating point instructions are executed by and during this will be in WAIT. This prefix makes sure that during execution of the instruction, control of system bus is not taken by other microprocessor. This is to share the common resources.
Each processor will take control of this bus only when it needs to use common resource. This signal will be made active during this instruction and it is used by the bus control logic to prevent others from taking the bus.
WAIT instruction this instruction takes to an idle condition. The CPU will not do any processing during this. On valid interrupt, ISR is executed and processor enters the idle state again. Flag for inappropriate content. Related titles. Microprocessor and Micro Controller Lecture Notes. Jump to Page.
Search inside document. Instruction set of Microprocessor By A.
Sanyasi Rao Assoc. Prof, Dept. Clear bits 0 and 1, set bits 6 and 7, invert bit 5 of register CL: An arithmetic shift preserves the number's sign.
SI, Destination ES: General format: LOOP r8 ; r8 is 8-bit signed value.
It is a 2 byte instruction. Used for backward jump only. Maximum distance for backward jump is only bytes. It depends on the way jump location is specified Ex. Documents Similar To Instruction set ppt. Anjinayulu Anji.
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