Question

17. JSR is a(n) -byte instruction. 18. CALL is a(n) -byte instruction. 19. True or false. The JSR target address can be anywhere in the 64−KB address space. 20. True or false. The CALL target address can be anywhere in the 1-MB address space. 21. When JSR is executed, how many locations of the stack are used? 22. When CALL is executed, how many locations of the stack are used? 23. Explain the differences between RTS and RTC. 24. Describe the action associated with the RTS instruction. 25. Give the size of the stack pointer in HCSt2. 26. In HCS12, which address is pushed onto the stack and what happens to the stack pointer when a JSR instruction is executed?

Answer 1

17.JSR is a 3-byte instruction. 18. CALL is a 3-byte instruction. 19. True, the JSR target address can be anywhere in the 64-KB address space. 20. False, the CALL target address can be anywhere in the 64-KB address space. 21. When JSR is executed, two locations of the stack are used. 22. When CALL is executed, one location of the stack is used. 23.

RTS and RTC are two instructions that are used in assembly programming. RTS stands for Return from Subroutine and RTC stands for Return from Call. The RTS instruction is used to return from the subroutine to the main program. The RTC instruction is used to return from a call subroutine instruction to the main program. 24.

The action associated with the RTS instruction is that it returns from the subroutine to the main program. 25. The size of the stack pointer in HCSt2 is 16 bits. 26. In HCS12, when a JSR instruction is executed, the address of the next instruction after the JSR instruction is pushed onto the stack, and the stack pointer is decremented by two.

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