MC 2025

8051 microcontrollers are manufactured by which of the following companies?

• Atmel

• Philips

• Intel

• All of the mentioned

8051 series has how many 16 bit registers?

• 2

• 3

• 1

• 5

How are the status of the carry, auxiliary carry and parity flag affected if the write instruction
MOV A,#9C
ADD A,#64H

• CY=0,AC=0,P=0

• CY=1,AC=1,P=0

• CY=0,AC=1,P=0

• CY=1,AC=1,P=1

The internal RAM memory of the 8051 is:

• 32 bytes

• 64 bytes

• 128 bytes

• 256 bytes

8051 has four ___ ports which are of 8-bit each.

• Input-Output

• Input

• Output

• None

In multiplication of two bytes in 8051 we must place another byte in ----------

• A Register

• B Register

• D Register

• E Register

8051 Microcontroller has ---------- timer

• 1

• 2

• 3

• 4

1.       TCON register is ---------------- bit wide.

• 8

• 12

• 16

• 20

The 8051 can handle ________ interrupt sources.

 

• 1

• 3

• 5

• 7

ADC0808, is  ______  A to D converter

• 2 bit

• 4 bit

• 8 bit

• 16 bit