The objective of this lab is to:

Learn how to write an ARM Cortex$-$M assembly program.

Learn how to use branch and conditional execution in ARM Cortex$-$M Assembly.

Set bit counter program:

A set bit counter program counts the total number of set bits $(1\text{'}$s$)$ within a register. For example, if the

register $r0$ serves as the input, the resulting count should be stored in register $r1$ as illustrated in Figure $0.$

$rO(32-$bit input register$)$

r$1(32-$bit output register$)$

Figure $0.$ Set bit counter program.

Lab Procedure:

Steps:

Download "Activity$\_8"$ from your Canvas and unzip it$.$

Open the "set$\_$bit$\_$counter. s$"$ file in your Keil IDE and browse the assembly code.

Write an assembly program that takes an unsigned number $x=0$xAABBCC$00,$ stored in

register $r0,$ and calculates the total number of set bits. The resulting count should be

stored in register $r1.$

Run the debugger and record the content of registers $r0$ and $r1$ to validate your results.

Checkout

Show the following to your instructor to receive credit:

Step $3.$

Step $4.$

register r$0,$ and calculates the total number of set bits. The resulting count should be

stored in register r$1.$