ECET 330 Exam

• There are 20 multiple-choice questions
• There are three short-answer questions
• There are 2 Essay questions
• Page 1

  Question 1.1. (TCO 1) The characteristics of dynamic memory compared to static memory are (Points : 8)

  higher density, higher cost.

  higher density, lower cost.

  lower density, higher cost.

  lower density, lower cost.

  Question 2.2. (TCO 1) Which of the following is volatile memory? (Points : 8)

  ROM

  RAM

  Flash

  All of the above

  None of the above

  Question 3.3. (TCO 1) With a 24-bit address bus, we get _____ bytes of memory space. (Points : 8)

  24M

  16M

  64M

  64K

  Question 4.4. (TCO 2) Which bus is bidirectional? (Points : 8)

  Address

  Data

  Control

  All of the above

  None of the above

  Question 5.5. (TCO 2) Which bus carries memory contents? (Points : 8)

  Data bus

  Address bus

  Control bus

  None of the above

  Question 6.6. (TCO 2) The address bus is __________. (Points : 8)

  bidirectional

  unidirectional

  able to be programmed to be either bidirectional or unidirectional

  None of the above

  Question 7.7. (TCO 3) To use JSR (or CALL) instruction, we must initialize _____ register. (Points : 8)

  X

  Y

  PC

  SP

  Question 8.8. (TCO 3) Find the value of Register A for the following program.

  LDAA #$55

  EORA #$AA (Points : 8)

  A = $00

  A = $FF

  A = $7F

  None

  Question 9.9. (TCO 3) The dollar sign ($) that precedes numbers in MC9S12 assembly language means that (Points : 8)

  it is a hexadecimal number.

  it is a decimal number.

  it is immediate mode.

  All of the above

  None of the above

  Question 10.10. (TCO 3) The largest value (in hex) that can be loaded into Register A of HCS12 is (Points : 8)

  $08.

  $255.

  $65535.

  $FF.

  Page 2

  Question 1.1.(TCO 4) What addressing mode is used for the instruction, INX? (Points : 8) Direct Indexed Inherent Immediate None of the above Question 2.2.(TCO 5) When instruction, “jsr”, is executed, the return address is stored at (Points : 8) PC. CCR. SP. memory pointed by SP. Question 3.3.(TCO 5) After the execution of the following code, the value in Register D is: LDAA #$BB LDAB #$CC ANDA #$0F ANDB #$F0 (Points : 8) $FFFF. $CCBB. $C00B. $0BC0. None of the above Question 4.4.(TCO 5) Which bit is used to indicate the sign of a 16-bit signed number? (Points : 8) D0 D15 D7 D1 Question 5.5.(TCO 5) In the following program, the maximum number of iterations is limited to _________. L1 CLRA NOP NOP DECB BNE L1 (Points : 8) 255 100 0x200 0x99 Question 6.6.(TCO 7) What C-language construct does the following assembly code implement? cmpb #10 bpl ADD37H addb #$30 bra CONT ADD37H: addb #$37 CONT: stab 0,x (Points : 8) Loop If If /else All of the above None of the above Question 7.7.(TCO 8) Assume that PORTB has a value of 0x37. Which of the following gives us unpacked BCD for 7? (Points : 8) PORTB = PORTB & 0x37; PORTB = PORTB | 0x30; PORTB = PORTB | 0x0F; PORTB = PORTB & 0x0F; Question 8.8.(TCO 8) The following program creates square wave pulses on PB0. What is the duty cycle? ORG $8000 LDS #$4000 LDAA #$FF STAA DDRB BACK BSET PORTB,000001 JSR DELAY JSR DELAY BCLR PORTB,000001 JSR DELAY JSR DELAY BRA BACK (Points : 8) 75% 66% 50% 25% Question 9.9.(TCO 8) Find the value for PORTB after the execution of the following code: PORTB = 0x55 ^ 0xFF; (Points : 8) PORTB = 0x05 PORTB = 0x0A PORTB = 0xAA PORTB = 0xFF Question 10.10.(TCO 8) Fill in the blank to get 0x38 on PORTB. unsigned char BCD_Byte = 0x89; unsigned char x; x = BCD_Byte & 0xF0; _____; PORTB = x | 0x30; (Points : 8) x=x>>4; x=x>>2; x=x<<4; x=x<<2;

  Page 3

  Question 1.1.(TCO 4) Write the assembly code to specify a word constant named num1 that has a value of $5423. a byte constant named num2 that has a value of 15. a word variable named big. (Points : 15) Question 2.2.(TCO 5) Given the value of Register B shown below, show the value of Register B and the carry after the execution of ASRB. Given the original content of Register B and carry flag 1 0 1 0 0 1 0 1 0 C Show the new values after executing: ASRB C (Points : 15) Question 3.3.(TCO 7) Write assembly instructions to clear Bit 5 of variable bar without changing other bits. (Points : 15) Question 4.4.(TCO 5) Show code for a nested loop to perform an action 10,000 times. (Points : 25) Question 5.5.(TCO 6) Write a C program to toggle PA2 of PORTA ON and OFF with a 1-ms delay after each toggle. Assume that clock frequency is 6.25 MHz. Write inline assembly-language code inside of the delay function.(Points : 35)

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