Please answer in Arm

Copy the contents of l03_t03.s into the CPUlator. Rewrite the program so that LED_BITS is stored in a memory location rather than defined with an .equ, and add a memory location named DELAY_TIME that stores the delay time 200000000 rather than defining it in the body of the program.

Alter these values in memory, and compile and run the program again. What effects do your changes have?

 l03_t03.s: */ // Constants .equ TIMER, 0xfffec600 .equ LEDS, 0xff200000 .equ LED_BITS, 0x0F0F0F0F .org 0x1000 // Start at memory location 1000 .text // Code section .global _start _start: LDR R0, =LEDS // LEDs base address LDR R1, =TIMER // private timer base address LDR R2, =LED_BITS // value to set LEDs LDR R3, =200000000 // timeout = 1/(200 MHz) x 200x10^6 = 1 sec STR R3, [R1] // write timeout to timer load register MOV R3, #0b011 // set bits: mode = 1 (auto), enable = 1 STR R3, [R1, #0x8] // write to timer control register LOOP: STR R2, [R0] // load the LEDs WAIT: LDR R3, [R1, #0xC] // read timer status CMP R3, #0 BEQ WAIT // wait for timer to expire STR R3, [R1, #0xC] // reset timer flag bit ROR R2, #1 // rotate the LED bits B LOOP .end