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Microprocessor based Systems Ain Shams University Faculty of Engineering Computer and Systems Department Spring 2013 Third Year CSE Sheet 1 (Covering Chapters 0 to 5) March 9th, 2012 Chapter 0 – INTRODUCTION TO COMPUTING 1. Find the total amount of the memory in units requested, for each of the following CPUs, given the size of the address buses: a) 16-bit address bus. (in K) b) 24-bit address bus. (in megs) c) 32-bit address bus. (in megabytes and gigabytes) d) 48-bit address bus. (in megabytes, gigabytes, and terabytes)

Chapter 1 – THE HCS12/9S12 MICROCONTROLLER HISTORY AND FEATURES 2.

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What components are usually put together with the microcontroller onto a single chip? 3. In an embedded controller with on-chip ROM. Why does the size of the ROM matter? Chapter 2 – HCS12 ARCHITECTURE AND ASSEMBLY LANGUAGE PROGRAMMING 4. What is the result of the following code and where is it kept? LDAA #$15 ADDA #$13 5. Which of the following instructions is (are) illegal? a- LDAA #500 b- LDAA #50 c- LDAA #00 d- LDAA #$255 e- LDAA #$25 f- LDAA #$F5 g- ADDA mybyte , # 6.

Which of the following instructions is (are) illegal? – ADDA #$300 b- ADDA #$50 c- ADDA #$500 d- ADDA #$255 e- ADDA #12 f- ADDA#$F5 g- ADDA #$25 7. 8. 9. 10. Show a simple code to load values 30H and 97H into locations 805H and 806H, respectively. Show a simple code to load value 55H into locations 300H and 308H. Show a simple code to load value 5FH into Port B. Which of the following is an invalid use of the immediate addressing mode? a- LDDA #$24 b- LDAA $30 c- LDAA #$60 11. Identify the addressing mode for each of the following: a- STAA PORTB b- LDAA #$50 c- STAA $800 d- LDAA #0 e- CLRA f- ABA 12. Indicate the size of nstruction for each of the following: a- STAA PORTB b- LDAA #$50 c- STAA $800 dLDAA #0 e- CLRA f- ABA Chapter 3 – BRANCH, CALL, AND TIME DELAY LOOP 13. Find the number of the times the following loop is performed: REGA EQU $800 REGB EQU $801 LDAA #200 STAA REGA BACK LDAA #100 STAA REGB HERE DEC REGB BNE HERE DEC REGA BNE BACK 14. Write two versions of a program to transfer a block of data one byte at a time. Use a) The LDAA and STAA instructions, and b) The MOVW instructions. Compare the size of the two programs. Which one takes fewer ROM locations? 15.

Write two versions of a program to transfer a block of data one word at a time. Use a) The LDD and STD instructions, and b) The MOVW instruction. Compare the size of the two programs. Which one takes fewer ROM locations? Chapter 4 – HCS12/9S12 I/O PORT PROGRAMMING 16. Write a program to get 8-bit data from PORTA and send it to PORTB and PORTH. 17. Write a program to get 8-bit data from PORTD and send it to PORTA and PORTH. 18. Write a program to toggle all the bits of PORTA and PORTB continuously A) Using AAH and 55H B) using the complement instruction. 19.

Write a program to toggle PB2 and PB5 continuously without disturbing the rest of the bits. 20. Write a program to toggle PB3, PB7 and PB5 continuously without disturbing the rest of bits. 21. Write a program to monitor bit PH3. When it is HIGH, send 55H to PORTB. Chapter 5 – ARITHMETIC, LOGIC INSTRUCTIONS, AND PROGRAMS 22. Find the C, Z and H flags for each of the following: a) LDAA #$3F ADDA #$45 b) LDAA #$99 ADDA #$58 c) LDAA #$FF STAA MYREG SEC LDAA #0 ADCA MYREG d) LDAA #$FF ADDA #$1 e) LDAA #$FF STAA MYREG SEC LDAA 0 ADCA MYREG f) CLC LDAA #$FF STAA MYREG LDAA #0 ADCA MYREG 23.

Write a program to add all the digits of your ID number and save the result in a RAM location. The results must be in BCD. 24. Write a program to add the following numbers and save the result in a RAM location. $25, $59, $65 25. Modify Problem 24 to make the result in BCD. 26. Write a program to a. Write 25H to Ram locations $1820-$1823, and b. Add all these RAM locations, contents together, and save the result in RAM location $1860. 27. Find the contents of register A after ach of the following instructions: a) LDAA #$65 ANDA #$76 b) LDAA #$70 ORAA #$6B c) LDAA #$95 EORA #$AA d) LDAA #$5D ANDA #$78 e) LDAA #$C5 ORAA #$12 f) LDAA #$6A EORA #$6E g) LDAA #$37 ORAA #$26 28. Assume that MYREG = 85H. Indicate if it skips after compare is executed in each of the following cases: a) LDAA #$90 CMPA #$85 BHI OVER INA ADDA #$2 OVER … b) LDAA #$70 CMPA #$85 BLO OVER INA ADDA #$2 OVER … c) LDDA #$85 CMPA #$85 BLO NEXT INA ADDA $2 NEXT … d) LDAA #$5D CMPA #$85 BHI NEXT INC A ADDA $2 NEXT … 29.

Find register A contents after each of the following is executed: a) LDAA #$65 CLC RORA RORA b) LDAA #$39 CLC ROLA ROLA c) CLC LDAA #$D4 RORA RORA RORA d) CLC LDAA #$A7 ROLA ROLA 30. Write a program that finds the number of the zeros in an 8-bit data item. 31. Write a program that finds the position of the first high in an 8-bit data item. The data is scanned from D0 to D7. Give the result for 68H. 32. Write a program that finds the position of the first high in an 8-bit data item. The data is scanned from D7 to D0.

Give the result for 68H. 33. Write a program to convert the following packed BCD number to ASCII. Place the ASCII codes in data RAM locations starting at $840. 34. Write a program to convert the following ASCII numbers to a packed BCD. MYASC_1 EQU ‘8’ MYASC_2 EQU ‘9’ Most of problems in this sheet are copied from the text book: HCS12 Microcontroller and Embedded Systems: Using Assembly and C with Code Warrior, Muhammad Ali Mazidi, Janice Mazidi, Danny Causey, Pearson Prentice Hall ,2009.

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