DAA Decimal Adjust Accumulator Instruction

This  instruction adjusts the contents  of the accumulator  into BDC (Binary Coded Decimal )  form  after a BCD  addition. It should be  used after ADD, ADI etc instruction if performing  BCD  addition  the  instruction format is

DAA

This is the only instruction which  uses auxiliary carry flag internally.

Flag: All flags  are moodier according  t the result.

 Followings  procedure is used by DAA instruction to convert the contents of th e accumulator from binary  to BCD.

a.If the value of  low order  four bits (D3 -D0)  in the accumulator of the accumulator  9 the instruction adds  6  to the low order four bits.

b.If the value of high  order four bits  (D7-D4)  in the accumulator  is more  than 9 the instruction adds  6 to the high  order four bits

See followings  example to understand the  working  of DAA instruction.

Posted Date: 4/5/2013 12:28:31 AM | Location : United States

Ask an Expert

Related Discussions:- Daa decimal adjust accumulator instruction , Assignment Help, Ask Question on Daa decimal adjust accumulator instruction , Get Answer, Expert's Help, Daa decimal adjust accumulator instruction Discussions

Write discussion on Daa decimal adjust accumulator instruction
Your posts are moderated

Write your message here..

Related Questions

What is the maximum entrance angle max, Calculate the N.A of a step index f... Calculate the N.A of a step index fibre having n 1 =1.48 and n 2 =1.46. What is the maximum entrance angle ψ max for this fibre if the outer medium is air with n 1 =1.0? Given

\, Refer to Figure 100. Assume MKS units. Given: R1= 4, R2=14, R3= 9, I4... Refer to Figure 100. Assume MKS units. Given: R1= 4, R2=14, R3= 9, I4= 8, I5= 7. Determine: Ieq, Req, and V3.

Compute the magnitude of the line-to-line voltage, Q. Three identical imped... Q. Three identical impedances of 30 30° are connected in delta to a three-phase 173-V system by conductors that have impedances of 0.8 + j0.6  each. Compute the magnitude of the l

Quality control, three reasons why a chamfer shouldn''t be considered an un... three reasons why a chamfer shouldn''t be considered an unimportant dimension

Measures for improving joints and connection, Measures for Improving Joints... Measures for Improving Joints and Connection 1. Spacing of poles: The spacing between poles (for overhead lines) is also an important requirement. Long spans will result in

Solve for the time-domain forced response of the resultant, Consider an RLC... Consider an RLC series circuit excited by v(t) = V m cos ωt in the time domain. By using superposition, solve for the time-domain forced response of the resultant current through

Determine the largest crest factor, A quantizer has 130 quantum levels that... A quantizer has 130 quantum levels that exactly span the extremes of a symmetrically ?uctuating message with step size δv = 0.04 V. Determine the following: (a) |f(t)|max.

Find the real and reactive powers per phase, Q. A 345-kV, 60-Hz, three-phas... Q. A 345-kV, 60-Hz, three-phase transmission line delivers 600 MVA at 0.866 power factor lagging to a three-phase load connected to its receiving- end terminals. Assuming that the

Disconnection of supply, Disconnection of Supply: An Appellate Tribuna... Disconnection of Supply: An Appellate Tribunal has been created over the Commissions for speedy dispute resolution. It is assumed to adjudicate appeals against orders of the a

Characteristics of unijunction transistor, Characteristics of  unijunction... Characteristics of  unijunction transistor: Characteristics : The static emitter characteristic of UJT at a given inter base voltage VBB in shown in fig. From fig., it is no