On mplabx ide create assembly code for unsigned integer division 1. (40 pts) Imp

Question

On mplabx ide create assembly code for unsigned integer division

1. (40 pts) Implement the unsigned integer division operation using the subtraction method shown in the following activity diagram/flowchart. Initialize p with Ox148F and d with 0x0041. Subtraction Method q,r= p any number (dividend) d = any number (divisor) r = p (reminder) q = 0 (quotient) r

Explanation / Answer

$Lab DivMod $Div,$Top,$Bot,$Temp ASSERT $Top $Bot ; Produce an error message if the ASSERT $Top $Temp ; registers supplied are ASSERT $Bot $Temp ; not all different IF "$Div" "" ASSERT $Div $Top ; These three only matter if $Div ASSERT $Div $Bot ; is not null ("") ASSERT $Div $Temp ; ENDIF $Lab MOV $Temp, $Bot ; Put divisor in $Temp CMP $Temp, $Top, LSR #1 ; double it until 90 MOVLS $Temp, $Temp, LSL #1 ; 2 * $Temp > $Top CMP $Temp, $Top, LSR #1 BLS %b90 ; The b means search backwards IF "$Div" "" ; Omit next instruction if $Div ; is null MOV $Div, #0 ; Initialize quotient ENDIF 91 CMP $Top, $Temp ; Can we subtract $Temp? SUBCS $Top, $Top,$Temp ; If we can, do so IF "$Div" "" ; Omit next instruction if $Div ; is null ADC $Div, $Div, $Div ; Double $Div ENDIF MOV $Temp, $Temp, LSR #1 ; Halve $Temp, CMP $Temp, $Bot ; and loop until BHS %b91 ; less than divisor MEND

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