Final Examination Solutions Fall 2006

PwnHero Final Examination COE538-Microprocessor Systems December 14, 2006 Name: _________________________ Student #: ________________ Section: ______ Seat #: ______ Time limit: 3 hours Examiners: V. Geurkov, A. Ye Notes: a) Closed book. b) No questions during exam period. State any assumptions. c) Questions 2a and 2b, 3 and 4, 5 and 6 - are of a multiple choice. Answer only one of them. d) For each question, show the process that is used to derive the answer. e) Answer neatly all questions in the space provided. Unclear answers will not be accepted. e) Circle your professor’s name and hand in these sheets. 1. Short Answer Questions on Serial Communication: a) Calculate the odd parity bit for the bit stream 10110110. [2 marks] 0 b) Discuss the major differences between the SCI and the SPI interfaces. [2 marks] SCI – asynchronous, without clock signal SPI – synchronous, with clock signal c) What do DTE and DCE stand for? Give an example for each. [2 marks] Data Terminal Equipment, Data Communication Equipment d) Describe the major differences between the full duplex, the half duplex, and the simplex configuration for serial communication. [2 marks] Full duplex – bidirectional, two lines Half duplex – one line, either one or another direction can be used Simplex – one line, one direction only e) Describe the procedures that the SCI interface of the 68HC11 processor uses to detect a start bit. [4 marks] A “0” following three “1”s; majority of samples are “0”s. 1 1 1 0 0 0 1 2 3 4 5 6 7 0 PwnHero.com