CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ. Electrical and Electronic Engineering

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1 CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Module Title: Microcomputer Applications Module Code: MIAP E3001 School: Electrical and Electronic Engineering Programme Title: Bachelor of Engineering in Applied Electronics Design Award Bachelor of Engineering in Automation and Control Award Bachelor of Engineering in Communications Systems - Award Programme Code: EAELN_7_Y3 EELAR_7_Y3 ECOSY_7_Y3 EAELD_7_Y3 External Examiner(s): Internal Examiner(s): Mr. David Denieffe, Dr Paula O Sullivan Mr. Fergus O Reilly Instructions: Answer THREE questions. All questions carry equal marks. Duration: 2 HOURS Sitting: Winter 2007 Requirements for this examination: Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator. 1 MIAP E3001

2 Q1 (a) Why might you use a micro-controller instead of a micro-processor? What features does a micro-controller have over a micro-processor? What advantages, disadvantages does each have? [8 marks] You have the following selection of micro-processors/micro-controllers available to you for a number of projects: (i) Low Power High Speed Motorola Family (40MHz), (ii) Microchip PIC 16c74 (4 MHz), (iii) AMD/Intel Pentium Clone (500 MHz), (iv) Analog Devices 8051(2MHz) compatible micro-controller. For each of the following applications identify (i) Approximate number of Input & Outputs (ii) Estimate of speed/performance required. (iii) Complexity/Range of algorithms/programmes to execute. Applications: Nintendo Wii type home games console 3G Mobile phone with camera Bed-side Digital Clock Choose one of the above processors for each application saying why you think it is appropriate to the application. [16 marks] (c) As a member of an 8-bit micro-processor usage team, you are tasked to devise a scheme to vary the number of special registers from 200 (basic model) to 400(advanced model), while being restricted to using only 8 bits(max of 256) to describe which register is in use. (i) Can you describe a scheme to do this? [6 marks] (ii) Which micro-processors/micro-controller currently make use of such a technique? [4 marks] 2 MIAP E3001

3 Q2 (a) Interrupt handling is important for embedded systems. Explain what happens when an interrupt occurs in the PIC and how the interrupt should be handled. Your answer should include what memory addresses are used, the different types of interrupts available and how they can be differentiated. [12 marks ] Explain the operation and configuration of Timer 1 on the PIC microcontroller. Derive the following formula for the preload value. [10 marks] Pre-load Value = 10000(hex) - Time * FOSC (Using Internal Clock) Prescalar * 4 (c) Calculate the pre-load value for the 16c74 micro-controller to generate a 10Hz square wave using Timer1, showing in code how the value would be loaded in. Assume a clock of 4MHz. [12 marks] Q3 (a) You have an analog signal with a maximum frequency of 2KHz which varies in voltage from 0 -> 4V. You wish to digitise this into a numerical value at a regular sampling interval. Describe how this can be done with a Microchip PIC, describing the manipulation of the input levels, range of output values and any key registers used both in the configuration and operation. How does one know that this conversion has completed? [14 marks] Write the configuration, interrupt handling and data reading/writing sections of a PIC assembly language program for the 16c74 micro-controller, which continually reads in an analogue voltage from 0 -> 4V on RA0 and outputs it in binary format on PORTB. [20 Marks] 3 MIAP E3001

4 Q4 (a) Asynchronous Serial Communication is supported on the PIC through the USART. Explain how this would this be configured to give an asynchronous serial interface at 1200 baud? In your answer, you should calculate the baud rate generator configuration value, using Low and High speed configurations, determine the better configuration and calculate the % error. [8 marks] Describe using a diagram either the Transmitter or Receiver section, naming the important registers and pins used, how it is used to Transmit or Receive data serially. [8 Marks] Describe how a LCD Display unit can be connected to a microprocessor/micro-controller and used to display text. Your answer should describe the input signals necessary for the LCD unit and how a microprocessor can supply these. [10 Marks] Provide sample code to show how the LCD control/output can be carried out, paying particular attention to the slowness of the LCD unit. [8 marks] 4 MIAP E3001

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Cork Institute of Technology. Autumn 2006 Microcomputer Applications (Time: 2 Hours)

Cork Institute of Technology. Autumn 2006 Microcomputer Applications (Time: 2 Hours) Cork Institute of Technology Bachelor of Engineering in Applied Electronic Design - Stage 3 Bachelor of Engineering in Electronic Automation and Robotics - Stage 3 Bachelor of Engineering in Communication