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Questions and Answers
What is the final value of register R21 after executing the following AVR assembly code?
What is the final value of register R21 after executing the following AVR assembly code?
- 0x05
- 0x00
- 0x10
- 0x15 (correct)
What is the primary function of the OUT instruction in AVR assembly programming?
What is the primary function of the OUT instruction in AVR assembly programming?
- Transfers data from a register to an I/O port. (correct)
- Jumps to a specific memory address.
- Sets a specific bit in a register to HIGH.
- Loads a value from memory into a register.
After executing the following AVR assembly code, which value will be stored in register R21?
After executing the following AVR assembly code, which value will be stored in register R21?
- 0x04
- 0x10
- 0x14
- 0x06 (correct)
In the provided AVR assembly code snipet, which specific instruction is responsible for loading the constant value 0x0A into register R21?
In the provided AVR assembly code snipet, which specific instruction is responsible for loading the constant value 0x0A into register R21?
Given the following AVR assembly code, what will be the hexadecimal value stored in register R21 after execution?
Given the following AVR assembly code, what will be the hexadecimal value stored in register R21 after execution?
Examine the following AVR assembly code. Which instruction facilitates the copying of the value stored in register R21 into register R22?
Examine the following AVR assembly code. Which instruction facilitates the copying of the value stored in register R21 into register R22?
Consider the code snippet provided. What is the final value of the register R21 after the INC instruction is executed?
Consider the code snippet provided. What is the final value of the register R21 after the INC instruction is executed?
After running the following AVR assembly code, what value will register R21 contain?
After running the following AVR assembly code, what value will register R21 contain?
In AVR assembly, what is the primary function of the RJMP instruction?
In AVR assembly, what is the primary function of the RJMP instruction?
Following the execution of the AVR assembly code snippet, what value will be stored within register R21?
Following the execution of the AVR assembly code snippet, what value will be stored within register R21?
What is the final value of register R21 after the following AVR assembly code is executed?
What is the final value of register R21 after the following AVR assembly code is executed?
In the context of AVR assembly, what is the function of the STS 0x100, R21 instruction?
In the context of AVR assembly, what is the function of the STS 0x100, R21 instruction?
What operation does the ADD instruction perform in the following AVR assembly code?
What operation does the ADD instruction perform in the following AVR assembly code?
What value does register R21 hold after the following AVR assembly code is executed?
What value does register R21 hold after the following AVR assembly code is executed?
After executing the provided AVR assembly code snippet, what will be the resulting value stored in register R21?
After executing the provided AVR assembly code snippet, what will be the resulting value stored in register R21?
Which instruction does the following AVR assembly code use to add the content of register R22 to register R21?
Which instruction does the following AVR assembly code use to add the content of register R22 to register R21?
What is the outcome of the following AVR assembly code in terms of register values?
What is the outcome of the following AVR assembly code in terms of register values?
In AVR assembly language, what is the function of the SBI instruction?
In AVR assembly language, what is the function of the SBI instruction?
What will register R21 contain after the following AVR assembly code is executed?
What will register R21 contain after the following AVR assembly code is executed?
In the context of AVR assembly programming, which specific instruction is used to load an immediate value directly into a register?
In the context of AVR assembly programming, which specific instruction is used to load an immediate value directly into a register?
What is the primary behavior of the BRNE instruction in AVR assembly?
What is the primary behavior of the BRNE instruction in AVR assembly?
Which action does the STS instruction perform in AVR assembly?
Which action does the STS instruction perform in AVR assembly?
A programmer is writing AVR assembly code and needs to copy the contents of one register into another. Which instruction should they use?
A programmer is writing AVR assembly code and needs to copy the contents of one register into another. Which instruction should they use?
What is the final value of register R21 after running the following AVR assembly code?
What is the final value of register R21 after running the following AVR assembly code?
When working with AVR assembly, which instruction is appropriate for comparing the values held in two different registers?
When working with AVR assembly, which instruction is appropriate for comparing the values held in two different registers?
Flashcards
What does ADD do?
What does ADD do?
Adds a constant value to a register. In the example, 0x05 is added to the value in register R21.
What does LDI do?
What does LDI do?
LDI (Load Immediate) loads a constant value directly into a register.
Function of OUT instruction
Function of OUT instruction
OUT sends data from a register to an I/O register, which controls peripherals.
What does SUB do?
What does SUB do?
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What does MOV do?
What does MOV do?
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What does INC do?
What does INC do?
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What does DEC do?
What does DEC do?
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What does STS do?
What does STS do?
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What is RJMP?
What is RJMP?
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What does SBI do?
What does SBI do?
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What is the function of BRNE?
What is the function of BRNE?
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What does CMP do?
What does CMP do?
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What does NOP do?
What does NOP do?
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What does JMP do?
What does JMP do?
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What does the AND instruction do?
What does the AND instruction do?
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What does LPM do?
What does LPM do?
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What does the OR instruction do?
What does the OR instruction do?
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What does LSL do?
What does LSL do?
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What is SBC?
What is SBC?
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What does CLR do?
What does CLR do?
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Study Notes
AVR Assembly Code Questions
- LDI R21, 0x10; LDI R22, 0x05; ADD R21, R22 results in R21 = 0x15 due to adding the values in R22 to R21
- The OUT instruction sends data from a register to an I/O register
- LDI R21, 0x10; SUB R21, 0x04 results in R21 having a value of 0x06, which is the result of the subtraction
- LDI R21, 0x0A' loads the constant value 0x0A into register R21 using the LDI instruction
- LDI R21, 0x10; DEC R21 will result in R21 = 0x0F due to decrementing R21
- MOV R22, R21 copies the value from R21 to R22 using the MOV instruction
- LDI R21, 0x05; INC R21 results in R21 = 0x06 due to incrementing R21
- LDI R21, 0x01; ADD R21, R21 results in R21 = 0x02 as R21 is added to itself
- RJMP does a jump to a relative address within ±2K range
- LDI R21, 0x03; SUB R21, 0x02 will result in R21 containing 0x01, which is the result of 3-2
- LDI R21, 0x05; MOV R22, R21; ADD R21, R22 results in R21 = 0x0A because R21 becomes 5 + 5
- STS 0x100, R21 uses the STS instruction to store the value of R21 in memory location 0x100
- LDI R21, 0x02; ADD R21, 0x03 adds 0x02 and 0x03, storing the result in R21
- LDI R21, 0x02; ADD R21, 0x03 results = R21 = 0x05
- LDI R21, 0x04; SUB R21, 0x02 results in R21 = 0x02 as 4 - 2 = 2
- ADD R21, R22 adds the contents of R22 to R21
- LDI R21, 0x10; ADD R21, 0x05; MOV R22, R21 results in R21 = 0x15 and R22 = 0x15
- SBI sets a specific bit in an I/O register to HIGH
- LDI R21, 0x03; DEC R21 results in R21 = 0x02 because R21 is decremented
- LDI R21, 0x10 loads an immediate value into register R21 using the LDI instruction
- BRNE branches if the result is not zero
- STS stores data from a register into SRAM
- MOV moves data between two registers
- LDI R21, 0x01; ADD R21, 0x01 results in R21 = 0x02 because R21 is incremented by one
- CMP is used to compare two registers
- The INC instruction increments a register by 1
- BRNE would be used to execute a conditional jump
- NOP does nothing (used for timing)
- OUT loads data from a register to an I/O port
- RJMP jumps to a nearby label (±2K range)
- LDI loads a constant value into a register
- ADD Adds the contents of two registers.
- MOV transfers data from one register to another
- OUT loads data from a register to an I/O register
- CMP can test if two registers are equal
- BRGE branches if the result is greater than or equal to zero
- JMP jumps to a specific address in memory
- LDI R21, 0x05; DEC R21 will result in R21 = 0x04
- AND performs a logical AND operation between two registers
- LPM loads data from the flash memory to a register
- LDI R21, 0x10; ADD R21, 0x05 results in R21 = 0x15
- CMP would be used to check if two registers are equal
- BRMI branches if the result is negative
- LDI R21, 0x07; ADD R21, 0x01 will result in R21 = 0x08
- OR is used to perform a bitwise OR operation
- LSL shifts the contents of a register left by one bit
- SBC: Subtract with carry
- CLR is used to clear a register to zero
- IN loads data from an I/O register to a CPU register
- BRNE branches if the result is not zero
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