Consider the following assembly code segment below:

LDR R$0,=0$x$40004$C$00$

ADD R$0,$ #$0$x$21$

MOV R$1,$ #$0$x$0$F

STRB R$1,[$R$0,$ #$0$x$04]$

MOV R$1,$ #$0$x$??$

STRB R$1,[$R$0,$ #$0$x$06]$

STRB R$1,[$R$0,$ #$0$x$02]$

What port is being configured in this assembly code segment?

What byte should you move to R$1$ in order to assign all of the input pins as pull$-$up while keeping the output pins as LOW? $($at the place #$0$x$??)$

$$

Consider the following assembly code segment below:

LDRB R$1,[$R$0,$ #$0$x$00]$

AND R$1,$ #$0$x$10$

CMP R$1,$ #$0$x$10$

In this code segment above, assume you are loading the byte from an input register for a given port. Why are you using an AND operation with the input register byte?