MB90660A Series
(Continued)
Symbol
rel
ear
eam
rlst
Meaning
Branch specification relative to PC
Effective addressing (codes 00 to 07)
Effective addressing (codes 08 to 1F)
Register list
Table 3 Effective Address Fields
Code
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19
1A
1B
1C
1D
1E
1F
Notation
Address format
R0 RW0 RL0 Register direct
R1 RW1 (RL0)
R2 RW2 RL1 “ea” corresponds to byte, word, and
R3 RW3 (RL1) long-word types, starting from the
R4 RW4 RL2 left
R5 RW5 (RL2)
R6 RW6 RL3
R7 RW7 (RL3)
@RW0
@RW1
@RW2
@RW3
Register indirect
@RW0 +
@RW1 +
@RW2 +
@RW3 +
Register indirect with post-increment
@RW0 + disp8
@RW1 + disp8
@RW2 + disp8
@RW3 + disp8
@RW4 + disp8
@RW5 + disp8
@RW6 + disp8
@RW7 + disp8
Register indirect with 8-bit
displacement
@RW0 + disp16
@RW1 + disp16
@RW2 + disp16
@RW3 + disp16
Register indirect with 16-bit
displacement
@RW0 + RW7
@RW1 + RW7
@PC + disp16
addr16
Register indirect with index
Register indirect with index
PC indirect with 16-bit displacement
Direct address
Number of bytes in address
extension *
—
0
0
1
2
0
0
2
2
Note: The number of bytes in the address extension is indicated by the “+” symbol in the “#” (number of bytes)
column in the tables of instructions.
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