[PC] ← [PC] + d
BRA <label>
BRA <literal>Size byte, word
Program execution continues at location [PC] + d. The displacement, d, is a two's complement value (8 bits for a short branch and 16 bits for a long branch). The value in the PC corresponds to the current location plus two. Note that a short branch to the next instruction is impossible, since the branch code 0 is used to indicate a long branch with a 16-bit offset.
A BRA is an unconditional relative jump (or goto). You use a BRA instruction to write position independent code, because the destination address (branch target address) is specified with respect to the current value of the PC. A JMP instruction does not produce position independent code.
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From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.