1. Which of the following instructions of an 8086 microprocessor uses the contents of a CX register as a counter?
1. LOCK
2. LOOP
3. ROTATE
Select the correct answer using the options given below:
1. LOCK
2. LOOP
3. ROTATE
Select the correct answer using the options given below:
2. What is the capacity of internal RAM in 8051 microcontroller?
3. Which of the following is not a characteristic of transparent DMA mode of I/O operation?
4. Which of the following peripherals provide I/O facilities?
1. 8279
2. 8155
3. 8259
4. 8255
1. 8279
2. 8155
3. 8259
4. 8255
5. Determine the contents of register AL in 8086 after the following instructions have executed
MOV BL, 8 CH
MOV AL, 7 EH
ADD AL, BL
MOV BL, 8 CH
MOV AL, 7 EH
ADD AL, BL
6. The interface chip used for data transmission between 8086 and a 16 bit ADC is
7. As compared to 16 bit microprocessor, 8 bit microprocessors are limited in
1. Speed
2. Directly addressable memory
3. Data handling capability
1. Speed
2. Directly addressable memory
3. Data handling capability
8. Which of following is used to reset entire interrupt structure in 8051 microcontroller?
9. In 8051, Match the following
Branch Instruction
Addressing
Jumping distance
a. LJMP
1. Relative
W. 11 bits
b. AJMP
2. Indirect
X. 16 bits
c. SJMP
3. Direct
Y. 8 bits
d. JMP@A+DPTR
4. Direct
Z. 16 bits
| Branch Instruction | Addressing | Jumping distance |
| a. LJMP | 1. Relative | W. 11 bits |
| b. AJMP | 2. Indirect | X. 16 bits |
| c. SJMP | 3. Direct | Y. 8 bits |
| d. JMP@A+DPTR | 4. Direct | Z. 16 bits |
10. In 8085, if the clock frequency is 5 MHz, the time required to execute an instruction of 18 T states is
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