How many bits are in the program counter register? How do you read the 8 bits in the status register SREG to R18?

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
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Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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How many bits are in the program counter
register?
How do you read the 8 bits in the status register
SREG to R18?
Address Instruction
2000
2001
2002
2003
2004
2005
2006
2007
2008
LDI R20, 5
LDI R21, 15
B1: INC R2O
CP R20, R21
BRNE B1
BREQ B2
DEC R20
B2: INC R2O
RET
a) What are the operands of the two branching
instructions? Remember that Branch instructions
have a signed 7 bit value. We are interested in
the two values that would be placed in that
branch instructions.
b) What is the value of R20 at the return of this
code?
Transcribed Image Text:How many bits are in the program counter register? How do you read the 8 bits in the status register SREG to R18? Address Instruction 2000 2001 2002 2003 2004 2005 2006 2007 2008 LDI R20, 5 LDI R21, 15 B1: INC R2O CP R20, R21 BRNE B1 BREQ B2 DEC R20 B2: INC R2O RET a) What are the operands of the two branching instructions? Remember that Branch instructions have a signed 7 bit value. We are interested in the two values that would be placed in that branch instructions. b) What is the value of R20 at the return of this code?
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