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Microcomp test1

QuestionAnswer
how are digits (number backwards) extracted from a binary integer repeatedly divide the number by 10 and the remainders give the digits right to left
what digits come from repeatedly dividing 5827 by 10 7 2 8 5
What does CLR.L D0 do before DIV.U clears all 32 bits of the D0 register, removing stale upper bits
Why is MOVE.W number,D0 not enough before DIVU it only chances D0[15:0] the upper 16 bits remain unchanged
What does DIVU.W #10,D0 calulate? It divides the 32 bit D0 number by 10 and stores the quotient/ remainder in D0
Where are the quotient and remainder after DIVU.W Quotient is in the lower word, and the remainder is in the upper word
What does SWAP do to a 32 bit register? it exchanges the upper and lower 16 bit words
What is the purpose of mask? To set, preserve, clear or toggle specific bits
Why reload an original LED pattern before each test To prevent ones experiment result from affecting the next
What should you record when tracing an instruction Changed registers/ memory, selected width, result and applicable flags
What does .B, .W, and .L specify operation width, .B = 8 bits (byte) .W = 16 bits (word) .L = 32 bits (long word)
What is the difference between ADD.W and ADD.L ADD.W only changes 16 bits and ADD.L operates on all 32 bits
What happens if stale upper bits are left after a byte/word load They can contaminate later calculations
How do you convert one ASCII digit to a number? Subtract the ASCII code for '0' from the digits ASCII code
What is the difference between LSR and ASR LSR shifts 0s, ASR preserves the signed bit for signed values
What does SUB calculate Destination minus source
What is the difference between C and V flags C relates to unsigned arithmetic V indicates signed overflow
What is the basic program structure initialize data -> process values -> store results
Created by: jayne_
 

 



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