E E 319K Midterm: EE319K Exam1Practice1Sol
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Your signature is your promise that you have not cheated and will not cheat on this exam, nor will you help others to cheat on this exam: No calculators or any electronic devices (turn cell phones off). You must put your answers on pages 2-6 only. You have 75 minutes, so allocate your time accordingly. Show your work, and put your answers in the boxes. Please read the entire quiz before starting. Consider the following 8-bit addition (assume registers are 8 bits wide) Interface the led to pe0 using negative logic. The desired led operating point is 1. 8v at 1. 2 ma. The output voltage vol of the microcontroller is 0. 5 v. you may also use 3. 3 power and ground, as you need them. Show the equation used to calculate the resistor value and the circuit diagram showing the connections. R = (3. 3-1. 8-0. 5)/1. 2ma = (1. 5-0. 5)/1. 2ma =(1v)/1. 2ma = 833 ohms.
