Microprocessors And Microcontrollers - Study Mode

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[#216] Consider the following statements: 1. A total of about one million bytes can be directly addressed by the 8086 microprocessor. 2. The 8086 has thirteen 16-bit registers. 3. The 8086 has eight flags. 4. Compared to 8086, the 80286 provides a higher degree of memory protection. Of these statements

(A) 2, 3 and 4 are correct

(B) 1, 2 and 4 are correct

(C) 1, 2 and 4 are correct

(D) 1, 2 and 3 are correct

Correct Answer

(C) 1, 2 and 4 are correct

[#217] Which one of the following control bits of 8086 flag register is used to put the 8086 in single step mode?

(A) DF

(B) IF

(C) TF

(D) ZF

Correct Answer

(C) TF

[#218] The 8255 programmable peripheral interface consist of . . . . . . . . 8-bit ports

(A) 2

(B) 3

(C) 4

(D) 6

Correct Answer

(B) 3

[#219] Which one of the following instructions in a stack computer consists of an operation code only with no address field?

(A) PUSH X

(B) POP X

(C) ADD

(D) LOAD A

Correct Answer

(C) ADD

[#220] Which is internal RAM address of SBUF in 8051?

(A) 99h

(B) 83h

(C) 82h

(D) 88h

Correct Answer

(A) 99h