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DO
Instruction Format:
DO
X:ea, expr
DO
Y:ea, expr
Opcode:
23
20 19
0
0
0
0
Instruction Fields:
ea=6-bit Effective Address=MMMRRR,
expr=16-bit Absolute Address in 24-bit extension word
Effective
Addressing Mode
(Rn)-Nn
(Rn)+Nn
(Rn)-
(Rn)+
(Rn)
(Rn+Nn)
-(Rn)
where "rrr" refers to an address register R0-R7
Timing: 6+mv oscillator clock cycles
Memory: 2 program words
MOTOROLA
INSTRUCTION DESCRIPTIONS
Start Hardware Loop
16 15
0
1
1
0
0
1
M
ABSOLUTE ADDRESS EXTENSION
M M M R R R
0 0 0 r r r
0 0 1 r r r
0 1 0 r r r
0 1 1 r r r
1 0 0 r r r
1 0 1 r r r
1 1 1 r r r
INSTRUCTION SET DETAILS
8
7
M
M
R
R
R
0
S
Memory SpaceS
X Memory
0
Y Memory
1
DO
0
0
0
0
0
0
0
A - 93
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