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AAA: ASCII Adjust after Addition operation the AAA instruction is executed after an ADD instruction that adds 2 ASCII coded operands to give a byte of outcome in the AL. The AAA instruction converts the resulting contents of AL to unpack the decimal digits. After the addition operation, the AAA instruction checked the lower 4 bits of AL to examine whether it have a valid BCD number in the range 0 to 9. If it is between range 0 to 9 and AF is set to zero, AAA sets the 4 high order bits of AL to 0. The AH might be cleared before addition operation. If the lower digit of the AL is between the range 0 to 9 and AF is set, 06 are added to the AL. The upper 4 bits of the AL are cleared and the AH is incremented by the value one. If the value in the lower nibble of the AL is greater than 9 then the AL is incremented by the value 06, AH is incremented by value I, the AF and the CF flags are set to I, and the higher 4 bits of the AL are cleared to the value 0. The remaining flags are not affected. The AH is modified as sum of earlier contents (typically 00) and the carry from the adjustment, as shown in given figure. This instruction does not give precise ASCII codes of the sum, but they may be obtained by adding 3030H to the AX.
Figure: ASCII Adjust After Addition Instruction
Pin Description of 8086 The microprocessor 8086 is a 16-bit CPU available in 3 clock rates, for example 5, 8 and 10 MHz, packaged in a40 pin CERDIP or plastic package. The 8
Assembly Language: Inside the 8085, instructions are really stored like binary numbers, not a very good manner to look at them and very difficult to decipher. An assembler is
Conditional branch Instruction When these type of instructions are executed, they transfer control of execution to the address mention relatively in the instruction, provided t
Interrupt When the CPU detects an interrupt signal, it stops activity of current and jumps to a special routine, known an interrupt handler. This handler then detects why the i
How do i convert a asci number to numerals?
write and run a programme using 8086 assembly language that interchange the lower four bits of AL registered with upper four bits.
Write a program that performs the addition, subtraction, multiplications, division of the given operands. Perform BCD operation for addition and subtraction.
• To develop an assembly language program to control a "simulated" intelligent domestic lighting system with the intention of deterring burglary. • To produce a schematic circuit d
a- Trace the following program fragment and find out the content of ax after the the execution of the program. X db 5,7 -3,-9,4,-7,9 Mov
DIV: Unsigned Division:- This instruction performs unsigned division operation. It divides an unsigned word or double word by a 16-bit or 8-bit operand. The dividend might be in t
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