Which of the following address is bit-addressable?

Which of the following is bit-addressable register? Explanation: The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers. Explanation: The registers, DPH and DPL are the higher and lower bytes of a 16-bit register DPTR.

What are the 4 ports of 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.

Which port of the 8051 is used as address data bus?

Port 0. Port-0 can be used as a normal bidirectional I/O port or it can be used for address/data interfacing for accessing external memory. When control is ‘1’, the port is used for address/data interfacing.

What is the bit side of the 8051 microcontroller?

Introduction to 8051 microcontroller It is an 8-bit microcontroller. It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers. It consists of are four parallel 8-bit ports, which are programmable as well as addressable as per the requirement.

What bit addressing?

Bit-addressable objects are objects that may be addressed as words or as bits. Only data objects that occupy the bit-addressable area of the 8051 internal memory fall into this category. The Cx51 Compiler places variables declared with the bdata memory type into the bit-addressable area.

What is the need of bit addressing in 8051?

One unique and powerful feature of the 8051 is single-bit operation. Single bit Addressing: Single-bit instructions allow the programmer to set, clear, move, and complement individual bits of a port, memory, or register. It is registers, RAM, and I/O ports that need to be bit-addressable.

How many ports are in 8051?

4 I
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.

What are the uses of port 0 and port 2 of 8051?

When connecting an 8051/31 to an external memory, port 0 provides both address and data. Port 1 is used as input and output. Upon reset, port 1 is configured as an input port. Port 2 is also used as input or output.

Which port is used for address bus?

Both the ports 0 and 2 can be used as address bus. Port 0 is used for lower order address and port 2 for the higher order address. A port having 8 pins you can utilise 16 lines as address bus at the maximum.

How many addressing modes are supported by 8051?

In 8051 There are six types of addressing modes.

How are bits addressed in a computer?

Most modern computers are byte-addressable. Each address identifies a single byte (eight bits) of storage. Data larger than a single byte may be stored in a sequence of consecutive addresses. There exist word-addressable computers, where the minimal addressable storage unit is exactly the processor’s word.

What is meant by bit addressing?

A 32-bit address is the address of a single byte. Thirty-two wires of the bus contain an address (there are many more bus wires for timing and control). Sometimes people talk about addresses like 0x2000, which looks like a pattern of just 16 bits.