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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
LABEL : The Label directive which is used to assign a name to the current content of the location counter. At the beginning of the assembly process, the assembler start a loca
write and run a programme using 8086 assembly language that interchange the lower four bits of AL registered with upper four bits.
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what is sahf nstrucions
MLIL: Unsigned Multiplication Byte or Word: This instruction multiplies an unsigned byte or word by the contents of the AL. The unsigned byte or word can be in any one of the gene
$NOMOD51 $NOSYMBOLS ;***************************************************************************** ; Spring 2013 Project ; ; FILE NAME : Project.ASM ; DATE : 3/30/20
Signal descriptions of 8086 : described below are common for the maximum andminimum mode bothdata lines AD15 -AD0: These are the time multiplexed andmemory I/O address. Addre
Flowchart for the sequence of 8251 Whether the control, mode or sync character register is selected depends on the accessing sequence. A flowchart of the sequencing is given i
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