Operation:
If (condition true) then PC + d -->; PC
Compatibility: 68000 Family
Assembler Syntax:
BRA <label>
Attributes: Size = (Byte, Word, Long*)
*(MC68020, MC68030, MC68040 only)
Description: Program execution continues at location (PC) +
displacement. The PC contains the address of the instruction
word of the BRA instruction plus two. The displacement is a
twos compliment integer that represents the relative distance
in bytes from the current PC to the 16-bit displacement
(the word immediately following the instruction) is used.
If the 8-bit displacement field in the instruction word is all
ones ($FF), the 32-bit displacement (long word immediately
following the instruction) is used. Condition code cc specifies
one of the following conditions.
Condition Codes:
Not affected.
Instruction Format:
\i3-++-----88-bit Displacement,016-bit Displacement if 8-bit Displacement = $00,032-bit Displacement if 8-bit Displacement = $FF,
Instruction Fields (Register Shifts):
Condition field -- The binary code for one of the
conditions listed in the table.
8-bit Displacement field -- Twos complement integer
specifying the number of bytes between the branch
instruction and the next instruction to be executed
if the condition is met.
16-bit Displacement field -- Used for the displacement when
the 8-bit displacement field contains $00.
32-bit Displacement field -- Used for the displacement when
the 8-bit displacement field contains $FF.
Note: A branch to the immediately following instruction auto-
matically uses the 16-bit displacement format because
the 8-bit displacement field contains $00 (zero offset).
Related Instructions:
Bcc,411
.422424