HP 3000 III Series Manual page 68

System/CPU Overview
INSTRUCTION BITS
8
I
9
I
10
I
11
I
12
I
13
I
14
I
15
o
o
1
1
6
I
7
o
14~------
Displacement
0: 2 5 5 - - +
1
Displacement
0: 255--+
o
Displacement
0: 255--+
1 0
Displacement
0: 127--+
1
~14---
Displacement
0: 63 - - +
1 1
114---
Displacement
0: 63 - - +
'--- -'1
ADDRESS
MODE
P+ Relative
P- Relative
DB+ Relative
0+ Relative
0- Relative
s-
Relative
CODE
DATA
SEGMENT SEGMENT
PB
.....
DL
......
DB
} 255
DB+ Relative
} 255
} 63
P- Relative
0- Relative
0
}m
P
} 255
0+ Relative
P+ Relative
} 63
S- Relative
S
PL
. .
Z
...
Figure 2-14. Memory Addres sing Modes
eters in subroutines. Not all memory address instructions are
capable of using all six relative modes. Each instruction defi-
nition (Section IV) will specify which modes are applicable for
each instruction.
2-50. Indirect Addressing
As shown in figure 2-15, indirect addressing uses the location
referenced by the initial displacement (the Indirect cell) to
specify another location within the same code or data segment.
For code references, the Indirect Cell contains a self-relative
address. For data references, the Indirect Cell contains a DB+
relative address. For memory address instructions (paragraph
2-44), indirect addressing is specified by bit 5 of the instruc-
2-36