# ANS2 - E C E 4 1 7 5 Q U IZ 3-3 1-1 0(1 o f 2 FIV E P R O B L E M S O p e n b o o k o p en no tes H igh U ppe r qua rte r M e dia n Lowe r qua rte

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ECE 4175 QUIZ 3-31-10 (1 of 2) High 101 FIVE PROBLEMS Upper quarter 82 Open book, open notes Median 73 Lower quarter 63 Low 37 1. Show the binary number, TEMP, that will be formed by the following operation if the input on RD5 (i.e., bit 5 of PORTD) is high: [10%] TEMP = ~PORTDbits.RD5 TEMP = 1 1 1 1 1 1 1 0 (binary value) 2. We want to use Timer2 to indicate five millisecond intervals, using the same Fcpu = 1 MHz that we have been using, and assuming that the CPU never sleeps. Show the values of PR2 and T2CON that will [15%] result in the setting of TMR2IF every five milliseconds. Show all work clearly. For AxBxC = 4x125x10 = 5000 PR2 = 124 (decimal) and T2CON = 01001101 (binary) or For AxBxC = 4x250x5 = 5000 PR2 = 249 (decimal) and T2CON = 00100101 (binary) 3. Consider the following LCD voltages. SEG1 is the frontplane driver voltage that drives the leftmost column of pixels on the front of the LCD. COM1 is the backplane driver voltage that drives the top [25%] row of pixels on the back of the LCD. Answer the questions below, given what you know from the LCD voltage waveforms discussed in class and the resulting RMS voltages found for those cases. a. Can you determine from these two waveforms any pixel(s) on the entire LCD that will be turned on? If so, which one(s)? Upper left corner pixel and also the pixel just below it ( i.e., R1C1 and R2C1)

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## This note was uploaded on 02/08/2011 for the course ECE 4175 taught by Professor Peatman during the Spring '08 term at Georgia Institute of Technology.

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ANS2 - E C E 4 1 7 5 Q U IZ 3-3 1-1 0(1 o f 2 FIV E P R O B L E M S O p e n b o o k o p en no tes H igh U ppe r qua rte r M e dia n Lowe r qua rte

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