EL $574$ MICROPROCESSOR SYSTEMS $($ARM$)$

ASSIGNMENT $1$

Unless otherwise stated, the architecture or instruction set of

the ARM Cortex M$4$ architecture is assumed.

In the code snippets are variables $x_1{x}_2{x}_3{x}_4$ and $x_5,$ which

represent missing numbers. Use the values in Table $1($which

correspond to serial numbers in the course registration form$)$ to

replace the variables given in the code.

Table $1$ Designation of missing variables

$SN$

$1,800132040,888$

$2,100023601$ OXFFF $884$

$3,240033801$ OXFOF $880$

$4,360043922OX0OF876$

$5,320054101$ OXF$00872$

$6,100064230OX0F0888$

$7,640014250$ OXFFE $884$

$8,160024280$ OXFEE $880$

$9,200034400$ OXEOE $876$

$10,160044422OX0OE872$

What will be the content of $R2$ after these instructions?

MOV $R2,$ #$x_1$

MOV $R3,2048$

ADD $R2,R2,R3,LSR\frac{?}{?}$# $x_2$

Assuming that the registers $R0,R1,R2,R3$ and $R4$ have

the following hex contents: $R0=0x04A,R1=0x3F,$ and

$R2=050B,R3=0580$ and $R4=030D.$ In case of each

of the following operations, state the content of each

register involved $[$assume that each operation is

independent of the other$].$

I. ORR $R3,R3,\frac{?}{?}$#$419$

$II.$ BIC $R0,R3,R4$

III. AND $R0,R1,R3$

$IV.RSBR0,R2,\frac{?}{?}$#$x.$

State the value in $R2$ after the following sequence of

instructions is executed:

MOV RO$,$ # $04$ BO

MOV R$1,$ # $x_4$

BIC R$2,$ R$1,$ R$0$

Suppose a certain memory location has the addresses

shown in Fig. $1$ and the numbers $890,24,580,0,17261,$

$245$ are stored in it$.$

Fig. $1$ A Portion ARM$7$ Memory with content

After the following sequence of instructions are executed:

MOV R$1,$ # $x_5$

MOV R$2,$ #$8192$

LDR R$0,[$R$1,$ R$2,$ LSR#$7]!$

a$)$ Which of the numbers would be stored in register R$0?$

Explain.

b$)$ What will be the values in registers R$1$ and R$2$ after

these instructions?

State the value in R$2$ after the following sequence of

instructions is executed:

a$.$ For a $4-$bit computer, indicate whether or not the

following operations will set the Carry flag:

i$.03+07$

ii$.11+8$

iii. $0A-09$

b$.$ For a $4-$bit computer, indicate whether or not the

following operations will set the oVerflow flag:

i$.03+07$

ii$.11+8$