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Electrical Engineering

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Apr 3, 2024

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EE234 Exam 1 Spring 2024 Name : Score: Part 1 : (3 points each) (C )1. Which of the following statements regarding the N flag of the status register SREG is true? (a) N is set when operation has a carry out (b) N is set when the operation result is 0 (c) N is set when the operation result is negative (d) N is set when the operation causes overflow (D )2. Which of the following is true regarding the H flag of the status register SREG? (a) H is set when there is a borrow during a subtraction (b) H is set when the operation is negative (c) H is set when the operation result is zero (d) H is set when there is a carry from bit 3 to bit 4 (A )3. Which of the following instructions is wrong? (a) ldi r0,0x30 (b) lds r1, 0x1000 (c) ldd r10,Y+20 (d) st -Z, r16 (B )4. Which register is used to specify the target address for the indirect jump instruction (IJMP)? (a) X pointer (b) Z pointer (c) Y pointer (d) EIND register (D )5.If you want to copy the contents of register r0 to r17, which of the following instruction should be used? (a) ldi r17,r0 (b) ldd r17, r0 (c) ld r0, r17 (d) mov r17, r0 (A )6. Assume that the contents of Z is 0x1000, then which of the following data memory location receives the value of r0 after the execution of the instruction “std Z+10, r0”? (a) location at 0x100A (b) location at 0x1009 (c) location at 0x1000 (d) location at 0x1020 (B )7.If [r3] = 0xD5, and C flag is 0, which of the following is correct after the execution of the instruction “asr r3”? (a) [r3] = EA, C = 0 (b) [r3] = 0xEA, C = 1 (c) [r3] = 0xAA, C = 0 (d) [r3] = 0xBB, C =1 (C )8. Which of the following instructions can be used to access the contents of a location in program memory? (a) ldd (b) ld (c) lpm (d) std (A )9. When does a for-loop evaluate the loop termination condition? (a) at the start of the loop (b) in the middle of the loop (c) at the end of the loop (d) can do it any place (C )10. Assume that [r0] = 0xAA, and [r1] = 0x55, what will be the new value of r0 after the execution of the instruction “eor r0, r1”? (a) 0x44 (b) 0x00 (c) 0xFF (d) 0x88 (A )11. After the execution of “ldi ZL,low(0x2010<<1)” and “ldi ZH,high(0x2010<<1)”, what is the value in the Z pointer? (a) 0x4020 (b) 0x8040 (c) 0x2010 (d) 0x1008 1
(A )12. After the execution of the instruction movw r16, r26, which of the following operation is performed? (a) r16 [r26], r17 [r27] (b) r26 [r16], r27 [r17] (c) r16 [r27], r17 [r26] (d) r26 [r17], r27 [r16] (D )13. Let [r16] = 0x6B, and C = 1, what is the new value for r16 and C after execution of ror r16? (a) [r16] = 0x6B, C = 0 (b) [r16] = 0x5B (c) [r16] = 0xB5, C = 0 (d) [r16] = 0xB5, C = 1 (B )14. The value in r16 register is divisible by 8, then what would be the value in r16 after the execution of andi r16, 0x07? (a) 0xFF (b) 0 (c) 0x55 (d) 0xA0 0000 0111 (A )15. For the instruction rcall k, which of the following is correct? (a) k is the distance of the subroutine (from this instruction) to be called (b) k is the address of the subroutine to be called (c) k is a register that holds the address of the subroutine to be called (d) the address of the subroutine to be called is in Z pointer Part II (10 points each) 1. Write an instruction sequence to copy the contents of program memory at 0x1050 to data memory location 0x2060 and copy the contents of program memory location at 0x1051 to data memory locations 0x2070. Solution: ldi ZL, low(0x1050) ldi ZH, high(0x1050) lpm r16, Z+ lpm r17, Z sts 0x2060, r16 sts 0x2070, r17 2. Write an instruction sequence to add 33 to the 16-bit value stored at data memory 0x2010~0x2011 and subtract 47 to the 16-bit value stored at 0x2040~0x2041. Solution : lds r24, 0x2010 lds r25, 0x2011 adiw r24, 33 sts 0x2010, r24 sts 0x2011, r25 lds r24, 0x2040 lds r25, 0x2041 sbiw r24, 47 sts 0x2040, r24 2
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