Motorola MC6805R Series - Page 66

Table 10-2. Read-Modify-Write Instructions
Addressing Modes
Indexed Indexed
Inherent (A)
Inherent (X)
Direct
(No Offset) (S-Bit Offset)
Op
# #
Op
# # Op # # Op # # Op
# #
Function'
Mnemonic
Code Bytes Cycles Code Bytes Cycles Code Bytes Cycles Code
Bytes Cycles Code Bytes Cycles
Increment
INC 4C 1 4 5C 1 4 3C 2
6
7C
1 6 6C 2
7
Decrement DEC 4A
1 4 5A 1 4 3A 2 6
7A
1 6 6A 2
7
Clear CLR
4F 1
4
5F
1
4
3F
2 6
7F 1 6 6F 2
7
Complement COM
43 1 4 53 1 4
33
2 6
73
1 6 63 2
7
Negate (2'8 Complement)
NEG
40 1 4 50 1 4 30 2 6
70
1 6 60 2
7
Rotate Left Thru Carry ROL
49 1 4 59 1 4 39 2 6
79 1 6 69 2
7
Rotate Right Thru Carry
ROR
46 1 4 56
1
4 36 2 6
76
1 6 66 2
7
Logical Shift Left LSL
48 1 4 58 1 4 38 2 6
78 1 6 68
2
7
Logical Shift Right
LSR 44
1
4 54
1 4
34
2 6
74
1 6 64 2
7
Arithmetic Shift Right ASR
47 1 4
57 1
4
37
2
6
77
1
6
67
2 7
Test for Negative or Zero TST 40 1 4
50 1
4
3D
2
6 70 1 6 60 2
7