Table of Contents
What is SReg in AVR?
Status Register (SReg) : It is the flag register in the AVR micro-controller. It is a 8 – bit register. The value of these bits indicates some conditions that result after the execution of an instruction.
Which of the following memory in ATmega32 is 16 bit wide?
The address bus is 16 bits wide.
What is the additional role of general purpose registers R26 R31 in the AVR microcontroller?
Registers R26 through R31 have some added functions to their general purpose usage. These registers are 16-bit address pointers for indirect addressing of the data space. The three indirect address registers (X, Y, and Z) are defined as described in the figure.
What type of instruction is CLR r16?
clear register
ser – set register and clr – clear register, allow you to set or clear all bits in a register. They are called with a single register between 16 and 31. ser and clr are provided by the assembler as they are quicker to type than the alternatives….Bit Manipulation.
| Mnemonic | Description |
|---|---|
| clr | clear register |
| swap | swap nibbles |
What is the function of Sreg?
The Status Register (SREG) contains information about the result of the most recently executed arithmetic instruction. This information can be used for altering program flow in order to perform conditional operations. SREG is updated after any of ALU operations by hardware.
What is the use of ROR instruction?
The right rotate instruction shifts all bits in the register or memory operand specified. The least significant bit is rotated to the carry flag, the carry flag is rotated to the most significant bit position, all other bits are shifted to the right.
What is AVR full form?
The Full form of AVR is Aortic Valve Replacement. An AVR is a type of open heart surgery used to treat problems with the heart’s aortic valve. The aortic valve controls the flow of blood out from your heart to the rest of your body.
What is the purpose of the status flag stored in the index file?
Status flags enable an instruction to act based on the result of a previous instruction. In pipelined processors, such as superscalar and speculative processors, this can create hazards that slow processing or require extra hardware to work around them.
What is LPM in AVR?
To be able to save constants in Flash memory the Load Program Memory, (LPM) instruction is included in the instruction set. Use of the LPM. The LPM instruction is included in the AVR instruction set to load a data byte from the FLASH program memory into the register file.
What does LPM R20 Z do?
The instruction “LPM R20,Z” loads R20 with the contents of the low byte of ROM location $500. Register R20 contains $57, the ASCII value for ‘W’. This is loaded to Port B. Next, ZL is incremented to make Z = $A01.