- Write a program to add the following numbers and save the result in R20. The numbers are $25, $19, and $12. Then extend the program to add the result with $3D and store it at memory location $0800. – Find the C, Z, and H flags for each of the following codes: (a) LDI R20, 0XFF (b) LDI R20, $FF LDI R21, 0x01 CLR R21 ADD R20, R21 SEC ADC R20, R21

Computer Networking: A Top-Down Approach (7th Edition)
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Author:James Kurose, Keith Ross
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Chapter1: Computer Networks And The Internet
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HOMEWORK (3)
Use AVR ATmega 328p assembly language for the following exercises.
1) - Write a program to add the following numbers and save the result in
R20. The numbers are $25, $19, and $12. Then extend the program to add
the result with $3D and store it at memory location $0800.
2) Find the C, Z, and H flags for each of the following codes:
(a) LDI R20, OXFF
(b)
LDI R20, $FF
LDI R21, 0x01
CLR R21
ADD R20, R21
SEC
ADC R20, R21
3) - Write a program to add $7F9A to $BC48 and save the result in R20 (low
byte) and R21 (high byte). Show the final result along with carry state
during addition.
4) - Repeat problem (4) for the two numbers $6CE8 and $4B8D.
5) - State the steps that SUB instruction will go through for each of the
following: (a) 23H - 12H (b) 43H-53H (c) 99H - 99H
6) - Write a program to subtract $7F9A from $BC48 and save the result in
R20 (low byte) and R21 (high byte). Show the final result along with carry
(borrow) state during subtraction.
7) - Show how to perform 77 x 34 in the AVR.
Transcribed Image Text:HOMEWORK (3) Use AVR ATmega 328p assembly language for the following exercises. 1) - Write a program to add the following numbers and save the result in R20. The numbers are $25, $19, and $12. Then extend the program to add the result with $3D and store it at memory location $0800. 2) Find the C, Z, and H flags for each of the following codes: (a) LDI R20, OXFF (b) LDI R20, $FF LDI R21, 0x01 CLR R21 ADD R20, R21 SEC ADC R20, R21 3) - Write a program to add $7F9A to $BC48 and save the result in R20 (low byte) and R21 (high byte). Show the final result along with carry state during addition. 4) - Repeat problem (4) for the two numbers $6CE8 and $4B8D. 5) - State the steps that SUB instruction will go through for each of the following: (a) 23H - 12H (b) 43H-53H (c) 99H - 99H 6) - Write a program to subtract $7F9A from $BC48 and save the result in R20 (low byte) and R21 (high byte). Show the final result along with carry (borrow) state during subtraction. 7) - Show how to perform 77 x 34 in the AVR.
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