Arithmetic Instructions
vAddition
- when adding binary numbers, the
microprocessor produces two types of information:
1. the sum of the two numbers (answer);
2. information indicating whether there were
carries in certain columns.
vCarry Flag
- during addition, the 8- bit sum is not the
complete answer. If the carry flag is set (has a value of 1), it indicates that
the 9th bit was produced.
-the 1 in the carry flag would indicate a
carry from column 8 to column 9.
- we cannot see a 9th bit since the accumulator only
holds 8 bit.
vHalf-Carry Flag
- indicates that a carry has
occurred from the 4th- bit column to the 5th-bit column.
vOverflow Flag
- alerts the programmer to a
condition that is similar to, but not the same as, that to which a carry flag
alerts the programmer.
vAddition with Carry
- the carry from the 8th bit to the 9th bit can be used during multiple-
precision arithmetic. We use the multiple- precision arithmetic when the
accumulator cannot accept numbers large enough for the desired operation.
nice info :D
ReplyDeletenice blog ! very informative :)
ReplyDeleteThanks again sir for this,we already encountered this "carry" in programming.What it means here is its function as an instruction.
ReplyDeleteNice one! :-D:-)
its good you have provided clear instructions for your students :)
ReplyDeletethanks for sharing your knowledge with us. this is very informative :) looking forward for more of your tutorials :)
ReplyDeletesir contrast po ung kulay...hehehe joke lang
ReplyDeletenaalala q nung nireport mo to sir, prang sabog ka lng. hahaha
ReplyDeletepro nagets q nman khit pano. :)
rollonRJS
ReplyDeleteSalamat sa info sir.
Jerome Partosa
There are only 10 types of person in the world: those who understand binary,and those who don't
ReplyDeleteRamos,Adonis