Question

Write an ARM assembly language program to collect the correct amount of road toll tax from a vehicle. If the vehicle is a motorbike then the correct road toll tax should be 2, otherwise the road toll tax should be 5. The vehicle type is given to you, so you don’t have to guess. Assume that someone has already put the vehicle type value in register R0. Therefore, R0 contains a value, 0 or some other value. If the value in register R0 is 0 then the vehicle is a motorbike, if it is any other value then it is not a motorbike. The correct road toll tax value needs to be in register R1. So at the end of your program R1 will either contain 2 or 5, depending on the value in R0. a) Make a flowchart of your program. b) Write the ARM assembly language program, matching the flowchart.

Answer 1

a) Flowchart

b) ARM Program

cmp r0, #0

beq true //true branch

mov r1, #5 //false

b done //done branch

mov r1, #2 //true