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instruction set need help

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V

vead

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hello experts
I need some help
I want to make 8 bit instruction using folloing component so I made one simple example

8 bit instruction set
4 bit opcode + 2 bit source register +2 bit destination register+ 4 bit data

accumulator A
memory register R1
memory register R2
memory register R3

0010 mov opcode

Code: 
opcode         source       destination       data
0010               00               00                 xx
                 R1  01           A  01                xx
                 R2  10               XX                xx
                 R3  00               XX                xx

load data directly into R1
mov R1#data

Code: 
opcode     source      destination       data
0010         R1 01          00                  data
load data directly into R2
mov R2#data

Code: 
opcode     source      destination       data
0010         R2 10          00                  data
load data directly into R3
mov R3#data

Code: 
opcode     source      destination       data
0010         R3 11          00                  data
load data directly into A
mov A#data

Code: 
opcode     source      destination       data
0010            00         A  01                  data
mov the content of R1 into Accumulator
mov A, R1

Code: 
opcode     source      destination       data
0010         R1 01          01                  disable
mov the content of R2 into Accumulator
mov A, R2

Code: 
opcode     source      destination       data
0010         R2 10          01                  disable
mov the content of R3 into Accumulator
mov A, R3

Code: 
opcode     source      destination       data
0010         R3 11          01                 disable
don't use any register disable

Code: 
opcode       source       destination       data
0010               00               00                 xx      don't use register
I can do same thing for other instruction
0110 And logic
Code: 
opcode         source       destination       data
0110               00               00                 xx
                 R1  01           A  01                xx
                 R2  10               XX                xx
                 R3  00               XX                xx
 

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