Download Microcomputer Applications Exam (ELTR7019) - Cork Institute of Technology, 2011 and more Exams Microcomputers in PDF only on Docsity! CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ Semester 1 Examinations 2010/11 Module Title: Microcomputer Applications Module Code: ELTR7019 School: Electrical and Electronic Engineering Programme Title: Bachelor of Engineering in Electronic Engineering - Award Programme Code: EELXE_7_Y3 External Examiner(s): Dr A. Donnellan, Mr I. Kennedy Internal Examiner(s): Mr F. O’Reilly Instructions: Answer 3 Questions. All questions carry equal marks. Duration: 2 Hours Sitting: Autumn 2011 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. Q1 (a) Compare and contrast microprocessors and micro-controllers. What advantages, disadvantages does each have? [8 marks] (b) You have the following selection of micro-processors/micro-controllers available to you for a number of projects: (i) Low Power Motorola 68000 (20MHz), (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: DVD Player Remote Control Unit Handheld Music Player such as an iPod/Zen General Purpose home computer 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 design 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. Can you suggest a scheme to do this? Which micro-processors/micro-controller currently uses such a technique? [10 marks] [Total: 34 marks] Q2 (a) Embedded/Micro-computer applications often use interrupts to signal events. Explain what an interrupt is and using the PIC as an example what happens when an interrupt occurs in the PIC and how the interrupt should be handled. Explain what memory addresses are used, the different types of interrupts TABLE 1
41-1: BAUD RATE FORMULA
SYNC BRGH = 0 (Low Speed) BRGH = 1 (High Speed)
0 (Asynchronous) Baud Rate = Fosc/(64(SPBRG+1)) Baud Rate = Fosci(16(SPBRG*1))
1 (Synchronous) Baud Rate = Fosc/(4(SPBRG+1)) NIA
TABLE 11-2: REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
Value on: Value on
Address Name Bit7 Bit 6 Bit5 Bit4 | Bit3 | Bit2 Bit1 Bito POR, all other
BOR RESETS
98h TXSTA CSRC TX9 TXEN [ SYNC = BRGH | TRMT | TX9D | 0000 -010 0000 -010
18h RCSTA | SPEN RX9 | SREN | CREN — FERR | OERR | RX9D | 000 -oox | 0000 -oox
99h SPBRG | Baud Rate Generator register 0000 0000 | 0000 0000
Legend: x = unknown, - = unimplemented, read as ‘0’. Shaded cells are not used by the BRG.
REGISTER 12-1: ADCONO REGISTER (ADDRESS 1Fh)
RW-0 RMLO RW _RIW-O RIW-0 RAW-O uo RIW-O
apcsi | apcso | CHs2 | CHs1 | CHSO [GO/DONE] — ADON
bit 7 bit 0
bit7-6 ADCS$1:ADCS0: A/D Conversion Clock Select bits
10= Fosc/a2
11= FRc (clock derived from the intemal A/D module RC oscillator)
bit5-3 CHS2:CHS0: Analog Channel Select bits
900 = channel 0, (RAQ/ANO)
001= channel 1, (RAI/AN1)
010 = channel 2, (RA2/AN2)
011= channel 3, (RA3/AN3)
100 = channel 4, (RAS/AN4)
101 = channel 5, (REO/ANS)()
110 = channel 6, (RE1/ANS)(?)
111 = channel 7, (RE2/AN7))
bit 2 GO/DONE: A/D Conversion Status bit
IFADON = 1
AID conversion in progress (setting this bit starts the A/D conversion)
0 = AID conversion not in progress (this bit is automatically cleared by hardware when the A/D
conversion is complete)
bit 1 Unimplemented: Read as '0'
bit O ADON: A/D On bit
1= AID converter module is operating
0 = A/D converter module is shut-off and consumes no operating current
Note 1: A/D channels 5, 6 and 7 are implemented on the PIC16C74B only.
Legend
R = Readable bit
-n = Value at POR
Ww
1
Writable bit
Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
REGISTER 12-2: ADCON1 REGISTER (ADDRESS 9Fh)
U-0 u-0 uc u-0 u-0 RW-0 RW-O0 RW
= = [= JT = JT = PCFG2 | PC=G1 | PCFGO
bit7 bito
oit7-3 _ Unimplemented: Read as '0'
dit 2-0 PCFG2:PCFGO0: A/D Port Configuration Control bits
PCFG2:PCFGO| RAO | RA1 | RA2 | RAS | RAS REO! /RE1") Re2l!)| Vrer
000 A A A A A A A A_| Voo
001 A A A A | Veer A A A | RAG
010 A A A A A D D D_ | von
on A A A A_| Veer OD D D_ | RA3
100 A A D D A D D D | voo
104 A A D D_ | vecr oD D D_ | RAs
11x D D D D D D D dD | voo
A= Analog input DD = Digital VO
Note 1: REO, RE1 and RE2 are implemented on the PIC16C74B only.
Legend:
R = Readable bit W = \Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR 1! = Bitis set '0'=Bitis cleared _x = Bit is unknown
PIC Pin-outs 40 Pin DIP Package
Pin Diagram:
PDIP, Windowed CERDIP
MCE poe)
2
4
7 og
es Wet
2 ek
oo
ao
=~
Vss —+q12 2 9
OSCICLKIN = OO
OSCZICLKOUT +—H rp=—» RDAIPSP4
RCO/TIOSOTICK] => Ys 28Q)=— RCT/RXIOT
RCIUTIOSUCCP2 <= q 8 sf ReBTNICK
RC2/CCP1 +—* d 17 2Q—=— R
RCBISCKISCL =—> "3 2— RC4ISDISDA
ROOPSEO -— 119 220]-+—» ROSPSPS
RDIV/PSP1 +—* (20 2:4» ROZPSP2
