MS51
Nov. 28, 2019
Page
486
of 491
Rev 1.00
MS51
32K
SE
RIES
TE
CHNICAL RE
F
EREN
CE MA
N
UAL
11.2 Instruction Set
Instruction
OPCODE
Bytes
Clock
Cycles
MS51 V.S. Tradition
80C51 Speed Ratio
NOP
00
1
1
12
ADD
A, Rn
28~2F
1
2
6
ADD
A, direct
25
2
3
4
ADD
A, @Ri
26, 27
1
4
3
ADD
A, #data
24
2
2
6
ADDC
A, Rn
38~3F
1
2
6
ADDC
A, direct
35
2
3
4
ADDC
A, @Ri
36, 37
1
4
3
ADDC
A, #data
34
2
2
6
SUBB
A, Rn
98~9F
1
2
6
SUBB
A, direct
95
2
3
4
SUBB
A, @Ri
96, 97
1
4
3
SUBB
A, #data
94
2
2
6
INC
A
04
1
1
12
INC
Rn
08~0F
1
3
4
INC
direct
05
2
4
3
INC
@Ri
06, 07
1
5
2.4
INC
DPTR
A3
1
1
24
DEC
A
14
1
1
12
DEC
Rn
18~1F
1
3
4
DEC
direct
15
2
4
3
DEC
@Ri
16, 17
1
5
2.4
MUL
AB
A4
1
4
12
DIV
AB
84
1
4
12
DA
A
D4
1
1
12
ANL
A, Rn
58~5F
1
2
6
ANL
A, direct
55
2
3
4
ANL
A, @Ri
56, 57
1
4
3