Please help me$.$ I am unsure why my code is not working. Please do assembly code. My code is pictered below.

XREF KeyPad, ReadIn

XDEF sety

$\backslash$table$[[$sety:$,$Idy #$4000,$: $1000$ microsec$],[$delay: dey,:decrement $y,],[,$cpy #$0,$: compare with $0],[$bne delay,if not $0$ go back and continue,$],[$RTS$,$: return to KeyFad if done,$]]$

KREF keypadseq, sety, port,u$,$ lookup. read$-$u$.,$ ton KDEF loadx

loadz: $1dz$ #keypadseq ; calling the keypadsequence to access each rom

KeyPad:

ldaa $1,zt$

cmpa #$0$

beq reset

staa port$\_$u

jsr sety

BRA ReadIn

getting ready to go through the sequence

checking to see if end of sequence

; if end of sequence

storing result

ReadIn:

$1$Hab port$\_$u

stab read$\_$u

andb #$$0$F ; ignore the upjer nibble

cmpb #$$0$F

beq KeyPad ; continue to next row

$1dy$ # lookup

$1$dab #$0$

bra KeyFress ; go ot look through table if there $13$ a key press

reset: $1dx$ #keypadseq

bra KeyPad ; resets the whole sequence

KeyPress:

ldaa port$-$u : load b iwth the old value of hte port $u$

cmpa #$$0$F

bne KeyPress process again if pressed

bra process

process: Idaa $1.y+$; this gets the look table too look at

cmpa read$\_$u

beq finish

inch

cmpb #$$10$

beq finish

hra process

finish:

stab ton : keep the key pressed value

Its ireturn to stack

Laboratory $7\mathrm{.}2$: PWM$,$ DC Motor Control using Real Time Interrupts.

The objective of this experiment is to write an assembly program that implements PWM to control the speed of the DC Motor on the I$/$O board in the lab. Instead of using delay loops and polling to implement the PWM strategy, as in Lab $4\mathrm{.}1,$ RTIs will be used. In the main program and the linker parameter file, initialize interrupts by using the information in the background section above. Select an RTI interval of $4ms.$

The unaltered keypad subroutine from Lab $5\mathrm{.}2$ should be called in the main program. It is okay to calculate $t_{on}$ and $t_{\text{o}\text{f}\text{f}}$ in the main program, but delay loops are not to be used to control the PWM signal.

The simplest way to complete this lab is to define a byte variable to use as a counter and initialize it to zero. In the interrupt routine, do the following:

Increment the count. If the count is less than or equal to $t_{0n},$ set bit $3$ of Port $T$ and exit the interrupt service routine.

Else, if the count is greater than $t_{0n},$ but less than or equal to $15,$ clear bit $3$ of Port $T$ and exit the interrupt service routine.

Else, if the count is greater than $15,$ clear the count and exit the interrupt service routine.