Motorola CPU32 Reference Manual page 106

BTST Test a Bit
BTST
Instruction Fields (Bit Number Static):
Bit Number field - Specifies the bit number.
Effective Address field - Specifies the destination location. Only data addressing modes are
allowed as shown:
Addressing Mode Mode Register
Addressing Mode Mode Register
Dn*
000
Reg. number: Dn (xxx).W
111 000
An
-
-
(xxx).L
111 001
(An)
010
Reg. number: An
#(data)
-
-
(An) +
011
Reg. number: An
-(An)
100 Reg. number: An
(d16, An)
101
Reg. number: An
(d16, PC) 111 010
(dg, An, Xn) 110
Reg. number: An
(da, PC, Xn) 111 011
(bd, An, Xn)
110
Reg. number: An (bd, PC, Xn)
111 011
*Long only; all others are byte only
Instruction Format (Bit Number Dynamic, specified in a register):
15 14 13 12 11 10
9 9 7 6 5 4 3 2
o
EFFECTIVE ADDRESS
0 0 0 0
REGISTER
1 0 0
I
MODE REGISTER
Instruction Fields (Bit Number Dynamic):
Register field - Specifies the data register that contains the bit number.
Effective Address field - Specifies the destination location. Only data addressing modes are
allowed as shown:
Addressing Mode
Mode Register Addressing Mode
Dn*
000
Reg. number: Dn (xxx).W
An
-
-
(xxx).L
(An)
010
Reg. number: An
#(data)
(An)
+ 011
Reg. number: An
-(An)
100
Reg. number: An
(d16, An) 101
Reg. number: An
(d16, PC)
(dg, An, Xn) 110
Reg. number: An
(da, PC, Xn)
(bd, An, Xn)
110
Reg. number: An (bd, PC, Xn)
*Long only; all others are byte only
CPU32 REFERENCE MANUAL
INSTRUCTION SET
Mode
111
111
111
111
111
111
Register
000
001
100
010
011
011
MOTOROLA
4-53
III