Question

You should now explore and document the following: 1. How can I watch a variable changing? 2. How can I watch the special function registers (SFR)? What does the program counter do when I step through my program? How does this relate to the program memory? 3. How does my C-code translate into assembly code? Can I simulate assembly commands? 4. Set the simulator to 16MHz (Project Properties -> Simulator) and use the Stopwatch to measure how long it takes to complete the while loop. 5. Can you work out how long one instruction cycle takes? How long does the increment command (i++) take? What is the relationship between the system frequency of 64MHz and the cycle frequency of 16MHz? 6. Can you write a for-loop or a function that takes exactly 50ms to complete? Can you write a general-purpose delay function based on this? For example, the function could have the following form: void delay(unsigned int timeInMilliseconds); . Hint: Use the View menu to find ways to observe your simulator states. Use the Debugger menu to set your simulator frequency and to open the stopwatch.

Nolan app

Answer 1

1. You can watch the variable changing by changing the value of the variable and changing the size of the variable by allowing the dynamic memory allocation for that variable and changing the memory size for the storing capacity of the variable in the program or you can simply make a variable that cannot exist outside an instance for example you create an variable for the for loop which means that the date variable will not be able to exist outside that for loop and you can use the same variable which makes the scenario of changing the variable possible .