Aaa-arithmetic instruction-microprocessor, Assembly Language

Assignment Help:

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.

425_ascii add.jpg

               Figure: ASCII Adjust After Addition Instruction


Related Discussions:- Aaa-arithmetic instruction-microprocessor

Timing diagram of minimum mode, give the explaination of timing diagram min...

give the explaination of timing diagram minimum mode memory write cycle

8279 keyword /display controller-microprocessor, 8279 Keyword /Display Cont...

8279 Keyword /Display Controller : Figure shows the structure of 8279 and its interface to the bus. Addressing is according to the table given below. CS        RD

Int n-unconditional branch instruction-microprocessor, INT N : Interrupt T...

INT N : Interrupt Type N:- In the interrupt structure of 8086/8088, 256 interrupts are distinct equivalent to the types from OOH to FFH. When an instruction INT N is executed,

Multiplication, how we can multiply two 8 bit number with rotation

how we can multiply two 8 bit number with rotation

Program for dispaying lcd characters, #include"lcd.asm"       ; assembly fi...

#include"lcd.asm"       ; assembly file is included for displaying lcd characters Main: PORTA EQU 0xF80  ; PORTS PORTB EQU 0xF81 PORTC EQU 0xF82 PORTD EQU 0xF83 R

Assembly language assignment, The main objective of the assignment is to ex...

The main objective of the assignment is to explore the knowledge regarding parallel ports of a computer system. You can read and write datato/from the parallel port using IN and OU

Assembly Language Programming, Write a program that defines symbolic consta...

Write a program that defines symbolic constants for all of the days of the week

8086, to separate positive and negative numbers

to separate positive and negative numbers

Program to average ten 16-bit values, Write a MC68HC12 assembly language pr...

Write a MC68HC12 assembly language program to average ten 16-bit values that are stored starting at address $1100. Place the two-byte result at $1110. Use indexed addressing. Us

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd