PIN DIAGRAM
How many pins are available in 8051?
40 pins
What is DPTR and PC?
Data Pointer and Program Counter
What is the internal RAM and internal ROM capacity of 8051
128 bytes and 4 Kilobytes
How many special function register are there in 8051. How many of them are bit addressable register
21 and 11
List any three types of Instruction set based on function.
Arithmetic Instruction, Logical Instruction, Data transfer instruction, Branch Instruction and Bit handling instruction
Which Port is used only for I/O Ports?
Port - 1
What is the value of external crystal used commonly for while microcontroller deals with serial communication?
11.0592 MHZ
How many banks are available in RAM memory?
4 Banks
What is the hex address of Port 0, Port 1, Port 2 and Port 3?
80 H, 90 H, A0 H and B0 H
What is the full form of DJNZ
Decrement Jump No Zero
Which Port requires pull up resistor?
Port - 0
How many address lines and data lines are in 8051?
16 address lines and 8 data lines
Which pin is used to access external memory?
EA - External Access
Which register is used to access the bank register in RAM?
Program Status Word (PSW), RS1 and RS0 bits
What are the different category of Jump instruction available in 8051?
Conditional Jump and Unconditional Jump or
Short Jump, Long Jump and Absolute Jump
What is the expansion of PSEN and ALE?
Program Store Enable and Address Latch Enable
How many timers are there in 8051? Mention its names.
Two 16 - bit timers. Timer 0 and Timer 1
Mention the address of bit addressable portion in RAM.
20 H to 2F H
List any 2 registers used in Timer operation with its address
TCON - 88, TMOD - 89, TL0 - 8A, TL1 - 8B, TH0 - 8C, TH1 - 8D
If A = 57 and B = 48. What is the value of A and B after the execution of MOV A,B instruction.?
A = 48 and B = 48
Mention the pin number of Port 2 .
21 - 28
What is the supply voltage of 8051 microcontroller.
5 V
In 8051 microcontroller 128 bytes are allocated for RAM and the remaining 128 bytes are allocated for ______________
Special Function Register
What is the hex address of Accumulator, B - Register and PSW Register
PSW - D0, A - E0 and B - F0
What is the name of the Instruction set which is used for calculation like AND, OR and XOR?
Logical Instruction