Integer multiplication of words is unsupported and can be implemented as a series of byte multiplications: 1. Initialize: Rx:Ry = word 1 Rx:Ry x Rm:Rn Ra:Rb Rm:Rn = word 2 2. Multiply: Rn*Ry → Ra:Rb 3. Multiply: Rn*Rx → Rc:Rd 4. Multiply: Rm*Ry → Re:Rf 5. Multiply: Rm*Rx → Rg:Rh 6. PO = Rb 7. P1 = Ra+Rd+Rf 8. P2 = Rc+Re+Rh+Carry 9. P3 = Rg+Carry Rc: Rd:00 Re:Rf:00 + Rg:Rh:00:00 P3:P2:P1:P0 It is recommended to use .DEF to rename registers into Ra, Rb, Rc, ..., etc. Take care when adding as any addition can generate a carry, i.e. Ra+Rd can generate a carry, as well as (Ra + Rb) + Rf.
Integer multiplication of words is unsupported and can be implemented as a series of byte multiplications: 1. Initialize: Rx:Ry = word 1 Rx:Ry x Rm:Rn Ra:Rb Rm:Rn = word 2 2. Multiply: Rn*Ry → Ra:Rb 3. Multiply: Rn*Rx → Rc:Rd 4. Multiply: Rm*Ry → Re:Rf 5. Multiply: Rm*Rx → Rg:Rh 6. PO = Rb 7. P1 = Ra+Rd+Rf 8. P2 = Rc+Re+Rh+Carry 9. P3 = Rg+Carry Rc: Rd:00 Re:Rf:00 + Rg:Rh:00:00 P3:P2:P1:P0 It is recommended to use .DEF to rename registers into Ra, Rb, Rc, ..., etc. Take care when adding as any addition can generate a carry, i.e. Ra+Rd can generate a carry, as well as (Ra + Rb) + Rf.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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HAS TO BE SOLVED BY USING MICROSHIP STUDIO with the ATmega2560 device
Transcribed Image Text:Arithmetic Algorithms
Integer multiplication of words is unsupported and can be implemented as a series of byte
multiplications:
1. Initialize: Rx:Ry = word 1
Rx:Ry
x Rm:Rn
Ra:Rb
Rm:Rn = word 2
2. Multiply: Rn*Ry→ Ra:Rb
3. Multiply: Rn*Rx → Rc:Rd
4. Multiply: Rm*Ry → Re:Rf
5. Multiply: Rm*Rx → Rg:Rh
6. PO = Rb
7. P1 = Ra+Rd+Rf
8. P2 = Rc+Re+Rh+Carry
9. P3 = Rg+Carry
Rc: Rd:00
Re:Rf:00
+ Rg:Rh:00:00
P3:P2:P1:PO
%3D
It is recommended to use .DEF to rename registers into Ra, Rb, Rc, .., etc. Take care when adding as any
addition can generate a carry, i.e. Ra+Rd can generate a carry, as well as (Ra + Rb) + Rf.
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