By using register indirect addressing mode, the internal or external addresses can be accessed. The R0 and R1 are used for 8-bit addresses, and DPTR is used for 16-bit addresses, no other registers can be used for addressing purposes. Let us see some examples of this mode.
Q. Which of these are indirect addressing modes?
There are 2 types(or versions) of Indirect Addressing Mode: Memory Indirect, and Register Indirect.
Table of Contents
- Q. Which of these are indirect addressing modes?
- Q. Which of the following are examples of register indirect addressing?
- Q. What is the addressing mode of MOV MC?
- Q. What is meaning of instruction MOV A 05H?
- Q. What is the meaning of instruction MOV?
- Q. What is the time taken by one machine cycle is crystal frequency is 20 Mhz?
- Q. What is JBC in 8051?
- Q. What is instruction and types?
- Q. What is instruction set of 8051?
- Q. What is LCD 16×2?
- Memory Indirect – In this type we directly mention the address of the memory location in the instruction either enclosed by parenthesis or preceded by ‘@’ character.
- Register Indirect –
Q. Which of the following are examples of register indirect addressing?
Register indirect addressing mode also used to call as indirect addressing mode. For example MOV A, M: means data is transferred from the memory address pointed by the register pair HLto the register A.
Q. What is the addressing mode of MOV MC?
Indirect addressing mode In this mode, the data is transferred from one register to another by using the address pointed by the register. For example, MOV A, M: means data is transferred from the memory address pointed by the register pair HL to the register A.
Q. What is meaning of instruction MOV A 05H?
data 05H is stored in the accumulator. address 05H is stored in the accumulator.
Q. What is the meaning of instruction MOV?
The MOV instruction moves data bytes between the two specified operands. The byte specified by the second operand is copied to the location specified by the first operand. The source data byte is not affected.
Q. What is the time taken by one machine cycle is crystal frequency is 20 Mhz?
What is the time taken by one machine cycle if crystal frequency is 20MHz? Explanation: It will be executed 200*100 times.
Q. What is JBC in 8051?
The JBC instruction branches to the address specified in the second operand if the value of the bit specified in the first operand is 1. Otherwise, execution continues with the next instruction. If the bit specified in the first operand is set, it is cleared.
Q. What is instruction and types?
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.
Q. What is instruction set of 8051?
The last group of instructions in the 8051 Microcontroller Instruction Set are the Program Branching Instructions….Program Branching Instructions.
| Mnemonic | Description |
|---|---|
| ACALL | Absolute Call to Subroutine (Unconditional) |
| RET | Return from Subroutine |
| RETI | Return from Interrupt |
| JMP | Jump to an Address (Unconditional) |
Q. What is LCD 16×2?
A 16×2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5×7 pixel matrix. The 16 x 2 intelligent alphanumeric dot matrix display is capable of displaying 224 different characters and symbols. This LCD has two registers, namely, Command and Data.
