ECE251 Intro to Microprocessors Final Exam July 6 th, 2017
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1 ECE251 Intro to Microprocessors Final Exam July 6 th, 2017 Name: Instructions: Open note, open book. Use a calculator. No internet or discussion with your neighbor. Work all problems and show ALL intermediate work, NOT just answers. Use engineering notation as appropriate. Return exam and all scratch work. 1. (30 points: A=10 points, B=8 points, C=12 points) BASICS A. The following TM4C instructions below are executed in order. What are the results? MOV R0,#0xA00C LDR R1,=0xFFEFE2F1 ORRS R2,R0,R1 R2: 0x N: C: V: LSRS R3,R2,#3 R3: 0x N: C: V: B. The SysTick Timer can generate periodic interrupts. Key SysTick registers include: ST_BASE, ST_CTRL, ST_RELOAD and ST_CURRENT (see p. 5 of exam). What register do you read to observe the value of SysTick? What value do you write to this register to clear it? Register. If the system clock (not the precision clock) is running at MHz, which SysTick register would be set to what value to create an interrupt every microseconds? Register set to value 10. C. Show your work on this question. Convert the following from the IEEE 754 standard to base 10: 0xf245bab9 Convert the following decimal number to the IEEE 754 single precision standard: *
2 2. (30 points) Analog to Digital Converter The system below converts a receiver antenna voltage signal directly to a digital signal. The Transducer and Prescaler converts input values linearly into output values. This is NOT the TM4C ATD converter. It is a fast 10-bit converter. If the antenna signal may contain frequencies up to 2.5 MHz, what is the longest sampling period that may be used? What is the resolution of this ATD converter measured at ATD input? What is the resolution of this ATD converter measured at Antenna Signal? What is the data rate of this ATD converter assuming the Nyquist Rate for the antenna signal above? 0x _ The ATD input is 3.1 v. What digital value is produced? The ATD input is 3.1 v. What antenna signal level produced this voltage? to 0x0A5 is the digital signal output. What range of antenna signals represents this digital value? 0x0A5 is the digital signal output. What antenna signal estimate best (smallest maximum error) represents this digital value?
3 3. (21 points) UART Protocol and Interface A. (15 points) Lucky has asked you to decipher the UART logic signal below. She told you only that it is sent at 4.8 Kbaud and that it shows a Stop bit at the beginning. Specifically, she wants to know the following: Is this transmission 7 bit, 8 bit or 9 bit (including possible parity) data? Is each frame ASCII or BYTE information? How do you know? What is the data that has been transmitted? Use or 0x as appropriate. What is the bit cell time? How long does it take to transmit the signal from first start bit to last stop bit? B. (6 points) Lucky has found some TM4C UART configuration code but has no idea what it does. Can you help her out a bit here! See p. 5 of exam. ; CPU Bus clock frequency is MHz. UART0_BASE EQU 0x4000C000 ; Base Address for UART0 registers LDR R0, =UART0_BASE MOV R1, #0x41 STR R1, [R0, #0x24]! ; Store to IBRD MOV R1, #0x12 STR R1, [R0, #0x4] ; Store to FBRD In instruction STR R1,[R0, #0x4] what is the (starting) address of memory used? _ What baud rate is the UART configured for? Extra Credit: If baud rate goal were the nearest exact multiple of 100 baud, e.g baud, what percentage error is this configuration?
4 4. (19 points) SSI Interface: TM4C to Nokia5110 The signals below shows the SSI Clock and TX/Data/MOSI signals being sent from the TM4C to The Nokia5110 display just after its X and Y addresses were set to 0,0. This is one continuous signal i.e. read the signal as the starting with the top clk/data set from left to right then continue with the second clk/data set from left to right. What would the upper left-hand corner of the display look like? Please fill in the pixel locations below: If the SSI Clock frequency is 500 KHz, how long is the first (widest) TX/Data/MOSI pulse above?
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6 Page 6 ECE251 Summer 2017 Final Exam Name: On my honor as a student, I pledge that I have not received or given any unauthorized assistance in this exam. Signature: ASCII TABLE
ECE251 Intro to Microprocessors Final Exam July 6 th, 2017
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