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EE319K_EXAM1_B_SOL_2010_FALL

EE319K_EXAM1_B_SOL_2010_FALL - EE319K Fall 2010 Exam 1B...

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EE319K Fall 2010 Exam 1B Solution Page 1 Jonathan W. Valvano October 1, 2010 10:00am-10:50am (5) Question 1. The format is 8-bit signed. What is the hexadecimal representation of the value -60? First way using basis. -128 needed -60+128 = 68, 64 needed 68-64 = 4, 4 needed. Binary is 11000200, which is $C4. Second way, first calculate +60 = 32+16+8+4, which in binary is 00111100. Next complement 11000011, then add one 11000100 = $C4. (5) Question 2. Which of the following techniques can be used to handle the problem of overflow? E) Implement ceiling and floor. G) Use promotion. (5) Question 3. Consider the following two instructions ldab #250 subb #-2 To determine the overflow (V) bit, first convert both to signed -128 to +127 ldab #-6 subb #-2 -6 – (-2) is -4, so V=0 To determine the carry (C) bit, first convert both to unsigned 0 to +255 ldab #250 subb #254 250-254 is -4, so C=1 (10) Question 4. For the circuit, see Figure 2.17 (b). The desired operating point is 2.6V at 10 mA. Ω = = = 200 0.01 4 . 0 6 . 2 5 I V V 5 R d OL d (10) Question 5. $0008 is pushed first, $4009 is the return address. Both numbers are big endian
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