R$1$

R$2$

R$3$

R$.$O$.$

R$1$

R$2$

Question $(20$ p$.)$:There are e some code templates for programming GPIO, For exarmple,

ORRO, $=$LABEL

LDR RO$,$ LABEL

LDR RO$,$ LABEL

LDR RO$,$ LABEL

LDR R$1,($RO$]$

R R$1,($RO$]$

LDR R$1,($RO$)$

LDR R$1,($RED

ORR R$1,$ R$1,$ #Ox$.....$

EOR R$1,$ R$1,$ HOX....

BIC R$1,$ R$\mathrm{.}1,$ HO$.$

STR R$1,($RO$]$

STR R$1,($RO$)$

STR R$1,($RO$)$

re are base addresses for ports below:

O Port A $($APB$)$ base: Ox$4000\mathrm{.}4000$

O Port A $($AHB$)$ base: Ox$4005\mathrm{.}8000$

GPIO Port C $($APB$)$ base: $0$x$4000,6000$

GPIO Port E $($APB$)$ base: $0/400$

O Port B $($APB$)$ base: $0$x$4000\mathrm{.}5000$

GPIO Port C $($AHB$)$ base: $0$x$4005.$A$000$GPIO Port D $($APB$)$ base: $0$x$4000\mathrm{.}7000$

GPIO Port E $($AHB$)$ base: $0/400$

GPIO Port F $($APB$)$ base: Ox$400$

Port B $($AHB$)$ base: Ox$4005\mathrm{.}9000$

GPIO Port D $($AHB$)$ base: $0$x$4005.$B$000$

GPIO Port F $($AHB$)$ base: $0/40$