Integer Instructions
MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 4-31
BCLR Test a Bit and Clear BCLR
(M68000 Family)
Instruction Format:
BIT NUMBER DYNAMIC, SPECIFIED IN A REGISTER
Instruction Fields:
Register field—Specifies the data register that contains the bit number.
Effective Address field—Specifies the destination location. Only data alterable
addressing modes can be used as listed in the following tables:
*Long only; all others are byte only.
**Can be used with CPU32.
1514131211109876543210
0000 REGISTER 1 1 0
EFFECTIVE ADDRESS
MODE REGISTER
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
(d
16
,An) 101 reg. number:An (d
16
,PC) — —
(d
8
,An,Xn) 110 reg. number:An (d
8
,PC,Xn) — —
MC68020, MC68030, and MC68040 only
(bd,An,Xn)** 110 reg. number:An (bd,PC,Xn)† — —
([bd,An,Xn],od) 110 reg. number:An ([bd,PC,Xn],od) — —
([bd,An],Xn,od) 110 reg. number:An ([bd,PC],Xn,od) — —
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