11. Identify the mathematical function that is performed by the following instructions.
MVI A, 07H
RLC
MOV B, A
RLC
RLC
ADD B
MVI A, 07H
RLC
MOV B, A
RLC
RLC
ADD B
12. A 8255 chip is selected when A2 to A7 bits are all 1. The address of port C
13. Consider the following loop:
MOV CX, 8000H
L1 : DEC CX
JNZ L1
The processor is running at 14.7456/3 MHz and DEC CX requires 2 clock cycles and JNZ requires 16 clock cycles. The total time taken is nearly
MOV CX, 8000H
L1 : DEC CX
JNZ L1
The processor is running at 14.7456/3 MHz and DEC CX requires 2 clock cycles and JNZ requires 16 clock cycles. The total time taken is nearly
14. Consider the following registers:
1. Accumulator and B register
2. B and C registers
3. D and E registers
4. H and L registers
Which of these 8-bit registers of 8085 µP can be paired together to make a 16-bit register?
1. Accumulator and B register
2. B and C registers
3. D and E registers
4. H and L registers
Which of these 8-bit registers of 8085 µP can be paired together to make a 16-bit register?
15. What will be the content of Accumulator, Register-B and Overflow flag (OV) after execution of following 8051 micro-controller assembly code?
MOV A, #65h
MOV 0F0h, #14h
DIV AB
DIV AB
MOV A, #65h
MOV 0F0h, #14h
DIV AB
DIV AB
16. The stack pointer will be affected by instruction:
1. PUSH PSW
2. CALL ADDR
3. XTHL
4. RST n
1. PUSH PSW
2. CALL ADDR
3. XTHL
4. RST n
17. What is the RAM and ROM size in 8051 microcontroller?
18. What is the maximum number of key codes that can be generated by 8279?
19. 8251 IC is a
20. How many bytes of bit addressable memory is present in 8051 based microcontrollers?
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