#include $//$ Include register definitions and useful macros

$.$section $.$init$0$

$/**$ EX: E$2\mathrm{.}0$

U$2$ is a shift register that controls the $2-$digit $7-$segment display on

the QUTy. The shift register's outputs, Q$0-$Q$6,$ drive the LED segments of

the display in an active$-$low configuration, while output Q$7$ selects the

LHS or RHS digit via U$3$ and U$4.$

The shift register has $8$ bits of internal memory which can be set using

the SPI CLK and SPI MOSI nets:

$-$ When the input connected to the SPI CLK net transitions from LOW to

HIGH $($rising edge$),$ bit $0$ of the internal memory is set to the current

state of the SPI MOSI net.

Simultaneously, the data in the internal memory is shifted by one bit

position to the left:

$-$ The previous value in bit $0$ is shifted to bit $1.$

$-$ The previous value in bit $1$ is shifted to bit $2.$

$-...$

Equivalently:

internal memory $<-$ LSL$($internal memory$)$

internal memory$[0]<-$ MOSI

When the input connected to the DISP LATCH net transitions from LOW to

HIGH $($rising edge$),$ the state of this internal memory sets the state

of outputs Q$0-$Q$7$:

Q $<-$ internal memory

For example, if we wanted to turn all segments of the display off, we

would transmit the byte $0$b$1111\_1111($note Q$7$ will not affect the

displayed pattern$),$ which corresponds to $8$ pulses of the SPI CLK net

with the SPI MOSI net constantly driven HIGH.

Assuming all nets are initially driven LOW, we could:

$1.$ Drive SPI MOSI HIGH

$2.$ Create a rising edge on the SPI CLK net $8$ times:

a$.$ Drive SPI CLK HIGH

b$.$ Drive SPI CLK LOW $($to prepare for next rising edge$)$

$3.$ Create a rising edge on the DISP LATCH:

a$.$ Drive DISP LATCH HIGH

If instead, you wanted to turn some segments on$,$ you would need to drive

the SPI MOSI net to the appropriate state before creating each rising

edge on the SPI CLK net.

In this way, you can independently set each bit in the internal memory

of the shift register $($and consequently, the corresponding output state

Q$0-$Q$7).$

TASK: Write assembly code below to configure the display on the QUTy to

display the final digit of your student number.

If the final digit of your student number is EVEN, it should be

displayed on the left$-$hand$-$side $($LHS$)$ digit of the display.

If the final digit of your student number is ODD, it should be displayed

on the right$-$hand$-$side $($RHS$)$ digit of the display.

EXAMPLE: If your student number was n$12345678$:

$"8"$ should be displayed on the LHS digit.

NOTE: Efficiency is not assessed in this exercise and therefore it is

not necessary to implement loops or subroutines.

$*/$

entry:

$/**$ CODE: Write your code for Ex E$2\mathrm{.}0$ below this line. $*/$