Which of the following instruction will add the accumulator and register 3?
Table of Contents
- 1 Which of the following instruction will add the accumulator and register 3?
- 2 How do you use CJNE?
- 3 Which I O port does not have dual purpose?
- 4 Which register is used for serial communication in 8051?
- 5 Are all the bits of flag register used in 8051?
- 6 How the carry flag will be affected for CJNE instruction?
Which of the following instruction will add the accumulator and register 3?
28. Which of the following statements will add the accumulator and register 3? 29. Data transfer from I/O to external data memory can only be done with the MOV command….Exercise :: The 8051 Microcontroller – General Questions.
| A. | MOV A, P27 |
|---|---|
| C. | MOV A, 27H |
| D. | MOV A, @27 |
How do you use CJNE?
The CJNE instruction compares the first two operands and branches to the specified destination if their values are not equal. If the values are the same, execution continues with the next instruction.
How many bits can be stored by an accumulator in 8051?
8-bits
The most widely used registers of the 8051 are A (accumulator), B, R0-R7, DPTR (data pointer), and PC (program counter). All these registers are of 8-bits, except DPTR and PC.
How many flags of PSW are affected by CJNE instruction?
8051 / 8052 Microcontroller Instruction Set CJNE – Compare and Jump if not Equal
| Instructions | OpCode | Cycles |
|---|---|---|
| Bytes : 3 Cycles : 2 Flags : C | ||
| CJNE @R0,# data , reladdr | 0xB6 | 2 |
| Bytes : 3 Cycles : 2 Flags : C | ||
| CJNE @R1,# data , reladdr | 0xB7 | 2 |
Which I O port does not have dual purpose?
The I/O port that does not have a dual-purpose role is: port 0 port 1.
Which register is used for serial communication in 8051?
8051 uses the SBUF register for Serial Communication which is explained below: SBUF register: SBUF is an 8-bit register used for serial communication in the 8051 microcontrollers.
What is the use of swap instruction in 8051?
The SWAP instruction exchanges the low-order and high-order nibbles within the accumulator. No flags are affected by this instruction.
What are the different types of instruction set of 8051?
They are:
- Data Transfer Instructions.
- Arithmetic Instructions.
- Logical Instructions.
- Boolean or Bit Manipulation Instructions.
- Program Branching Instructions.
Are all the bits of flag register used in 8051?
Are all the bits of flag register used in 8051? The flag register also called as the program status word uses only 6 bits. The two unused bits are user definable flags. Carry, auxiliary carry, parity and overflow flags are the conditional flags used in it.
How the carry flag will be affected for CJNE instruction?
The CJNE instruction compares the value of operand1 and operand2 and branches to the indicated relative address if they are not equal. If the two operands are equal, program flow continues with the instruction following the CJNE instruction. This instruction also affects the carry flag in the PSW.
How do you clear an accumulator in 8051?
Description: CLR clears (sets to 0) all the bit(s) of the indicated register. If the register is a bit (including the carry bit), only the specified bit is affected. Clearing the Accumulator sets the Accumulator’s value to 0….8051 / 8052 Microcontroller. Instruction Set. CLR – Clear Register.
| Operation: | CLR |
|---|---|
| Function: | Clear Register |
| Syntax: | CLR register |