Source register
   Source and destination
   Destination register
   Immediate value
   Update (inc/dec) field
   Condition code
 
 
 
 
 
 
SND field (operand gets Negated)
S SND OPCODE 0 0   RR ADD R1 R2
3:0 SND OPCODE 1 0   iR ADD 3 R1
DST IMM16   15:0 SN OPCODE 0 1  IRR ADD 1234h R1 R2
DST IMM20   15:0 19:16 OPCODE 0 1   IR MOV 12345h R1
DST CND code 1 up 5:0 SN OPCODE 1 1  iRR ADD -25 R2 R3 ZERO R4-
DST CND code 0 upd S SN OPCODE 1 1  RRR ADD D1+ R2 D3+ LSB0 R4

Examples
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
 
9
 
8
 
7
 
6
 
5
 
4
 
3
 
2
 
1
 
0

Aux flag

Imm/Reg flag 

 Short/Long flag