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Which instruction of 8086 can be used for look up table manipulation?
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What is xlat in 8086?
XLAT instruction converts the contents of AL register into a number stored in a memory table,this instruction perform the direct table look up technique often used to convert one code to another.An XLAT instruction 1st add the contents of this AL to BX to form a memory address within a data segment .It then copies the contents of this address into AL.This is the only instruction that adds an 8 bit number to 16-bit number.
What is the function of xchg and xlat in 8086?
xchg- Exchange contents of specified destination and source operands. eg. XCHG AL, CL Exchange contents of Al with CL XCHG BP, SI Exchange contents of BP with SI xlat- It is a translate instruction used for code conversion using look up table technique
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Why memory to memory acess is not possible in 8086 micro processor?
Memory to memory access is certainly possible in the 8086/8088 microprocessor. Look at the repeated string copy instructions.
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When ANI F instruction is used in microprocessor?
The ANI F instruction causes the assembler to look in the symbol table for the symbol F, and to build an instruction that ANDs immediate that value with the accumulator. If you meant to say ANI 0FH, that means to clear the high 4 order bits of the accumulator and to retain the low 4 order bits.
How does a compute know whether the contents of a memory location should be treated as a program instruction or as a piece of data?
It all depends on the flow of the instruction stream. If the processor fetches the memory location under direct fetch under control of the program counter, it is clearly an instruction. If the processor accesses the memory location as a result of fetching or storing an operand, it is clearly data. Where it may be unclear, and subject to interpretation, is when the fetch is part of a table lookup indexing through an array. It could go either way, depending on how you look at it. In the 8085, if S0 and S1 are both high during a fetch, it is an opcode fetch. The 8086/8088 is similar but S0 and S1 are inverted in that case, i.e. both low during opcode fetch. The bottom line is that, for the 8085, it does not matter because there is only one address space and, for the 8086/8088, the processor knows when to use CS (Code Segment) versus DS (Data Segment).
Write a progrm for the look up table of square of hexadecimal digit 0 to F is present in memory from address 49007H Using XLAT instruction obtain the square of digit 4 from look up table?
The answer is 1.773453258976759325597867757785495485674456954686379546745667754411451284522488527785578547. I used a hexadecimal program to create this wonderful answer called PRESS RANDOM NUMBERS! True or false. Email me @ jay.panandiker@gmail.com!
What is look up table in 8051 microcontrollers?
A look-up table is a table of constants stored in program memory -Look-up tables can be used to speed up arithmetic operations -The look-up table may be accessed using the DPTR or PC as a pointer to the start of the table. The A register is used as an index to the table.
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