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System/CPU Overview
o
1
2
3
4
5
6
7
8
9 10 1112 13 14 15
GENERAL
FORMAT
Memorv
Opcode
or
Sub·opcode
Group
Sub-opcode
Mini·opcode
or
Special
Opcode
o
1
2
3
4
5
6
7 8
9 10 11 12 13 14 15
IMMEDIATE~
, ~
J
~
or: 1 Sub·opcode 3
Operand
STACK
OP
o
1
2
3 4
5
6
7
8
9 10 11 12 13 14 15
FIELD
2
4
5
6
7 8
9 10 11 12 13 14 15
Stack Op A
Stack Op B
Sub·opcode 2
J·Field
K·Field
SHIFT
o
1
2
3 4
5
6
7
8
9 10 11 1213 14 15
~
'
•
J
~
Index
Count
Bit
REGISTER
CONTROL
Except
XCHD, ADDS,
SUBS
Sub·opcode 2
.
Register
Name
15
0
2
3
4
5
6
7
8
9 10 11 12 13 14 15
5
6
15
BRANCH
PROGRAM
CONTROL
Except
AND SPECIAL
BR,BCC
Except
Sub·opcode
3
N·Field
Indirect
PAUS, HALT
Bit
XEO,IXIT,
DISP
2
4
:,
6
7
8
9 10 11 12 13 14 15
9 10 11 12 13 14 15
FIELD AND
I/O AND
BIT
INTERRUPT
Sub·opcode
3
Special
K·Field
Index
Opcode
lor not
Bit
used)
MOVE
Ex..:ept
MVBW
......,.-J
SOEC
PBIOB
Relative or
Additional
Code Bit
LOOP
CONTROL
+1-
Relative
SPECIAL
Except
LLBL
Additional
Code Bit
MEMORY
ADDRESS
Except
LOPP,
LOPN
Memorv
Opcode
Inde"
Bit
Indirect
Bit
2152·33
Figure 2-13.
Instr uction Groups
2-29
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