HW4 solutions - Electrical Computer Telecommunications...

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Electrical, Computer, & Telecommunications Engineering Technology Micro Computers Spring 20073 0618-303 Homework #4 HOMEWORK #4 Due 4/11/08 1. What is the stack? The stack is a group of memory locations in RAM used for temporary storage or microprocessor register contents and return addresses. 2. Which internal register of the AVR holds the address of the top of the stack? The Stack Pointer is the internal register that contains the address of the top of the stack. 3. What is the top of the stack? The top of the stack is the next available location in RAM for writing to. 4. What happens to the stack pointer when data is pushed on the stack? What happens to the stack pointer when data is pulled off the stack? When data is pushed onto the stack, the stack pointer decrements by 1 for each byte that is pushed. When data is pulled off of the stack, the stack pointer increments by 1 for each byte that is pulled.
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