After executing the instruction “pshd”
Appreciate any help with the following questions. Please give brief explanation for each answer.
1) After executing the instruction “pshd”, which of the following registers will change?
(a) X (b) D (c) CCR (D) SP
2) Which flag is used to see if the signed data are correctly added together?
(a) V (b) C (c) H (d) Z
3) In the following program, what is the largest number that Register B can take?
L1 CLRA
NOP
NOP
DECB
BNE L1
(a) 255 (b) 100 (c) 0X200 (d) 0x99
4) What is the C statement to write 85 HEX to Port B?
(a) DDRB = $85; (b) PTB = 85 (c) PORTB = 0x85; (d) All of the above (d) None of the above
5) Assume that PORTB has a value of 0x05. Which of the following gives us an ASCII digit for ‘5’?
(a) PORTB= PORTB & 0x35; (b) PORTB= PORTB | 0x30; (c) PORTB= PORTB | 0x03; (d) PORTB= PORTB & 0x30;
6) The highest single digit in BCD is _____.
(a) 0x09 (b) 0x0F (c) 0x0A (d) 10
Answers
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Posted 22 May 2017 08:05 AM
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