9.1 Memory and Prefix instruction Flashcards
1
Q
What are the standard data load instructions in HEX-8
A
1
Q
What are the offset data access instructions in HEX-8
A
2
Q
Why is relative data access essential (address + offset)
A
Useful for various data structures
3
Q
How is memory connected to the datapath in HEX-8
A
- Areg (value input) and RReg (address) input.
- Output to RMUX (decide between values)
4
Q
How does fetch work in HEX-8
A
5
Q
Why there need for the PFIX instruction in hex-8
A
255 possible memory addresses but only 4 bits.
6
Q
What does PFIX do in HEX-8
A
Copies operand into sig-half of oreg
oreg is reset after next command
