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ons within that module
　　6. Embedded systems always require the user to manipulate bits in register
s or variables. Given an integer variable a, write two code fragments.
　　The first should set bit 5 of a. The second shnuld clear bit 5 of a. In bo
th cases, the remaining bits should be unmodified.
　　7. What does the following function return?
　　char foo(void)
　　{
　　 unsigned int a = 6;
　　 iht b = -20;
　　 char c;
　　 (a+b > 6) ? (c=1): (c=0);
　　 return c;
　　}
　　8. What will be the output of the following C code?
　　main()
　　{
　　 int k, num= 30;
　　 k =(num > 5 ? (num <=10 ? 100:200): 500);
　　 printf(“%d”, k);
　　}
　　9. What will the following C code do?
　　int *ptr;
　　ptr =(int *)Ox67a9;
　　*ptr = Oxaa55;
　　10. What will be the output of the follow C code?
　　#define product(x) (x*x)
　　main()
　　{
　　 int i = 3, j, k;
　　 j = product(i++);
　　 k = product(++i);
　　 printf(“%d %d”,j,k);
　　}
　　11. Simplify the following Boolean expression
　　!((i ==12) || (j > 15))
　　12. How many flip-flop circuits are needed to divide by 16?
　　13. Provides 3 properties that make an OS, a RTOS?
　　14. What is pre-emption?
　　15. Assume the BC register value is 8538H, and the DE register value is 62
A5H.Find the value of register BC after the following assembly operations:
　　MOV A,C
　　SUB E
　　MOV C,A
　　MOV A,B
　　SBB D
　　MOV B,A
　　16. In the Assembly code shown below
　　LOOP: MVI C,78H
　　 DCR C
　　 JNZ LOOP
　　 HLT
　　How many times is the DCR C Operation executed?
　　17. Describe the most efficient way (in term of execution time and code si
ze) to divide a number by 4 in assembly language
　　18. what value is stored in m in the following assembly language code frag
ment if n=7?
　　 LDAA #n
　　LABEL1: CMPA #5
　　 BHI L3
　　 BEQ L2
　　 DECA
　　 BRA L1
　　LABEL2: CLRA
　　LABEL3: STAA #m
　　19. What is the state of a process if a resource is not available?
　　#define a 365*24*60*60
　　20. Using the #define statement, how would you declare a manifest constant
that returns the number of seconds in a year? Disregard leap years in your an
swer.
　　21. Interrupts are an important part of embedded systems. Consequently, ma
ny compiler vendors offer an extension to standard C to support interrupts. Ty
pically, the keyword is __interrupt. The following routine (ISR). Point out pr
oblems in the code.
　　__interrupt double compute_area (double radius)
　　{
　　 double area = PI * radius * radius;
　　 printf(“\nArea = %f”, area);
　　 return area;
　　}



Hongkong Bank笔试题
　　1. Please state why you chose to follow these activities and how they have
contributed to your personal development. You may wish to give details of you

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