What are different types of instructions in 8051?

They are:

• Data Transfer Instructions.
• Arithmetic Instructions.
• Logical Instructions.
• Boolean or Bit Manipulation Instructions.
• Program Branching Instructions.

What are I O instructions in 8051 microcontroller?

8051 microcontrollers have 4 I/O ports each of 8-bit, which can be configured as input or output. Hence, total 32 input/output pins allow the microcontroller to be connected with the peripheral devices. Pin configuration, i.e. the pin can be configured as 1 for input and 0 for output as per the logic state.

What are the four I O Ports in 8051?

The 8051 has four important ports. Port 0, Port 1, Port 2 and Port 3. These ports allow the microcontroller to connect with the outside world. The four ports of 8051 microcontrollers have certain specific functions and corresponding features.

Which instruction can be used to access the I O ports of 8051?

Instructions JNB and JB can be used for any bits of I/O ports 0, 1,2, and 3, since all ports are bit-addressable.

What are arithmetic instructions?

The arithmetic instructions define the set of operations performed by the processor Arithmetic Logic Unit (ALU). The arithmetic instructions are further classified into binary, decimal, logical, shift/rotate, and bit/byte manipulation instructions.

What is IO port programming?

In 8051, I/O operations are done using four ports and 40 pins. I/O operation port reserves 32 pins where each port has 8 pins. The other 8 pins are designated as Vcc, GND, XTAL1, XTAL2, RST, EA (bar), ALE/PROG (bar), and PSEN (bar).

What are the 3 types of instructions?

A computer must have the following types of instructions:

• Data transfer instructions.
• Data manipulation instructions.
• Program sequencing and control instructions.
• Input and output instructions.

What is types of instruction?

The instruction types include load and store with reservation, synchronization, and enforce in-order execution of I/O. They are especially useful for multiprocessing. Flow Control Instructions – These include branch, Condition-Register logical, trap, and other instructions that affect the instruction flow.

What is the SP size in 8051 microcontroller?

8-bits wide
The stack pointer in the 8051 is 8-bits wide, and it can take a value of 00 to FFH. When the 8051 is initialized, the SP register contains the value 07H.