Question

Microprocessor 8086 material.

Choose True or False

1-Multiplexing operation is used to reduce the number of pins in 8086Mp. *
True
False

2-In 8086Mp, the only way to access the flags register bits is by using the instructions (PUSHF) and (POPF). *
True
False

3-CBW and CWD can be used with both signed and unsigned numbers. *
False
True

4-In order to set any bit in a register, AND instruction is used, while to clear any bit in a register, OR instruction is used. *
True
False

5-There are 20 address lines and 8 data lines in 8086MP. *
False
Ture

Answer 1

1. True

Explanation: Multiplexing means sending a stream of multiple signal over a communication link the same time and at the receiver end demultiplexing process is used to seperate the multiplexed signal.

In 8086 microprocessor the address and data bus are multiplexed in AD0 - AD15 to reduce the number of pins required.

2. True

Explanation: PUSHF instruction is used to copy the flag register to the top of the stack

POPF instruction is used to copy the word in the top of the stack to the flag register

3. False

Explanation: CBW instruction is used to convert signed byte into signed word

CWD instruction is used to convert signed word into double signed word

4. False:

Explanation: AND instruction is used to clear one or more bits in a register

OR instruction is used to add one or more bits in a register

5. False

Explanation: In 8086 microprocessor 20 address line and 16 data lines are there.